什么是标准电极电势？
What is the standard electrode potential?
标准电极电势是在标准状态（25℃、1 atm或1 bar、离子活度为1）下，某半反应相对标准氢电极的电势差，单位为伏特。电势越正，氧化型越易得电子、氧化性越强。它用于判断氧化还原自发方向和计算电池电动势。
The standard electrode potential is the potential difference of a half-reaction relative to the standard hydrogen electrode under standard conditions (25 C, 1 atm or bar, unit activity), measured in volts. The more positive it is, the more easily the oxidized form gains electrons and the stronger its oxidizing power. It is used to judge the spontaneity of redox reactions and compute cell voltage.
难度 专业 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Brown, LeMay 等,《Chemistry: The Central Science》第14版,Pearson,2017
T. L. Brown et al., Chemistry: The Central Science, 14th ed., Pearson, 2017
#标准电极电势 #半反应 #电动势
什么是双电层？
What is the electric double layer?
金属浸入电解质溶液时，表面因离子溶解或吸附形成电荷，溶液侧出现等量反号离子层，构成紧密层与扩散层结合的界面结构，称为双电层。双电层电势差正是电极电势的微观来源，也是电容和腐蚀的基础。
When a metal is immersed in an electrolyte, its surface gains charge by ion dissolution or adsorption, and an equal opposite-charged ion layer forms on the solution side, creating an interfacial structure of a compact and a diffuse layer called the electric double layer. Its potential difference is the microscopic origin of electrode potential and the basis of capacitance and corrosion.
难度 专业 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-10-04
来源 · Source
Bard, A. J.; Faulkner, L. R. 《电化学方法：基础与应用》（第2版，Wiley）双电层章节, 2001
Bard, A. J.; Faulkner, L. R. Electrochemical Methods: Fundamentals and Applications, 2nd ed., Wiley, 2001 (electric double layer)
独立核验依据 · Independent verification: 核验依据 1 ISBN 978-0-471-04372-0 (2000, Wiley)
#双电层 #电极电势 #界面
什么是浓差电池？
What is a concentration cell?
浓差电池是由两个相同电极但电解质浓度不同的半电池组成的原电池，其电动势来源于浓度差而非电极种类差异。浓度高的一侧发生还原、低的一侧发生氧化，直至浓度趋于平衡。它能说明扩散驱动的电能产生方式。
A concentration cell is a galvanic cell made of two identical electrodes but half-cells with different electrolyte concentrations; its voltage comes from the concentration difference rather than different electrode materials. Reduction occurs on the more concentrated side and oxidation on the dilute side until concentrations equalize. It illustrates electricity generated by diffusion driving force.
难度 专业 · 适合 大众
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：著录含书名，但缺版次 / 出版社 / 年份中的一部分，需编辑补全后才能做独立比对。
Atkins 与 de Paula《物理化学》（第10版，牛津大学出版社）电化学（浓差电池）章节
Atkins, P. W.; de Paula, J. Physical Chemistry, 10th ed., Oxford University Press (concentration cells)
#浓差电池 #电动势 #扩散
电镀时金属为什么能均匀地长到工件表面？镀层是怎么来的？
How does electroplating make metal grow evenly onto a workpiece, and where does the coating come from?
电镀属于电解：把工件（如铁件）接在阴极，要镀的金属（如铜、镍）作阳极，放入含该金属离子的电解液中。通电后阳极金属溶解（M-ne- 生成 Mn+），补充溶液中消耗的金属离子；同时 Mn+ 在阴极获得电子还原沉积成金属原子，逐层析出在工件表面。控制电流密度、温度和添加剂，可以使镀层晶粒细小、结合牢固且厚度均匀。镀层既美观又能防腐蚀，是典型的金属覆盖层保护方式。
Electroplating is electrolysis: the workpiece (say iron) is the cathode, the coating metal (copper or nickel) is the anode, and both sit in an electrolyte containing that metal's ions. On current flow the anode dissolves (M - ne⁻ → Mⁿ⁺), replenishing the ions the solution uses up, while at the cathode Mⁿ⁺ gains electrons and is reduced to metal atoms that deposit layer by layer on the workpiece. Controlling current density, temperature and additives yields fine grains, strong adhesion and uniform thickness. Besides looks, the coat shields the base metal from corrosion.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
傅献彩 等,《物理化学》第5版,高等教育出版社,2005
Fu Xiancai et al., Physical Chemistry, 5th ed., Higher Education Press, 2005
独立核验依据 · Independent verification: 核验依据 2 DOUBAN ISBN 标识 9787040167696（按标识回读: 物理化学(第五版)上册）
#电镀 #电解 #阴极沉积
什么是钠硫电池？
What is a sodium-sulfur battery?
钠硫电池是一种高温熔盐电池，以液态钠为负极、硫为正极、β-氧化铝陶瓷为固态电解质，工作温度约300至350摄氏度。放电时钠失去电子生成钠离子穿过电解质与硫形成硫化钠。它具有高能量密度，常用于电网储能。
A sodium-sulfur battery is a high-temperature molten-salt cell with liquid sodium as the negative electrode, sulfur as the positive electrode and a beta-alumina ceramic as the solid electrolyte, operating around 300 to 350 degrees Celsius. During discharge, sodium loses electrons to form Na+ that crosses the electrolyte and reacts with sulfur to form sodium sulfide. It has high energy density and is used for grid storage.
难度 专业 · 适合 大众
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：著录含书名，但缺版次 / 出版社 / 年份中的一部分，需编辑补全后才能做独立比对。
Sudworth, J. L.; Tilley, A. R. 《钠硫电池》（Chapman & Hall）, 1985
Sudworth, J. L.; Tilley, A. R. The Sodium Sulfur Battery, Chapman & Hall, 1985
#钠硫电池 #熔盐 #储能
为什么锂电池不能过度充电？
Why must lithium batteries not be overcharged?
过度充电会使正极材料结构破坏、负极锂金属析出形成枝晶，可能刺穿隔膜造成内部短路，甚至引发热失控燃烧。此外过充会加速电解液分解、损害循环寿命。因此电池管理系统必须限制充电上限电压。
Overcharging destroys the positive electrode structure and causes metallic lithium to plate as dendrites on the negative electrode, which can pierce the separator and short the cell internally, even triggering thermal runaway and fire. It also accelerates electrolyte decomposition and harms cycle life. A battery management system must therefore cap the charging voltage.
难度 专业 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-11-02
来源 · Source
Tarascon, J.-M.; Armand, M. 《可充电锂电池面临的挑战》，《Nature》, 2001
Tarascon, J.-M.; Armand, M. 'Issues and Challenges Facing Rechargeable Lithium Batteries,' Nature, 2001, 414, 359–367
独立核验依据 · Independent verification: 核验依据 1 CROSSREF 标识 10.1038/35104644：Issues and challenges facin
#锂电池 #过充 #枝晶
为什么铝不能像铁那样用碳还原？
Why can't aluminum be reduced with carbon like iron?
Al₂O₃ 太稳定、碳还原不经济；Hall-Héroult 法用熔融冰晶石电解氧化铝得铝，因此极耗电。
Al₂O₃ is too stable for economical carbon reduction; the Hall-Héroult process electrolyzes alumina in molten cryolite, so it is very power-hungry.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
傅献彩 等,《物理化学》第5版,高等教育出版社,2005
Fu Xiancai et al., Physical Chemistry, 5th ed., Higher Education Press, 2005
独立核验依据 · Independent verification: 核验依据 2 DOUBAN ISBN 标识 9787040167696（按标识回读: 物理化学(第五版)上册）
#电解铝 #冰晶石 #能耗
什么是电解，电镀利用了什么原理？
What is electrolysis, and what principle does electroplating use?
电解是在电流作用下强迫非自发的化学反应发生，如电解水产生氢气和氧气。电镀利用电解把金属离子还原成金属镀在物品表面，起保护和装饰作用。
Electrolysis forces a non-spontaneous chemical reaction using electric current, such as splitting water into hydrogen and oxygen. Electroplating uses electrolysis to reduce metal ions into a metal coating on an object for protection and decoration.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
傅献彩 等,《物理化学》第5版,高等教育出版社,2005
Fu Xiancai et al., Physical Chemistry, 5th ed., Higher Education Press, 2005
独立核验依据 · Independent verification: 核验依据 2 DOUBAN ISBN 标识 9787040167696（按标识回读: 物理化学(第五版)上册）
#电解 #电镀 #离子
能斯特方程在电化学里起什么作用？
What role does the Nernst equation play in electrochemistry?
能斯特方程 E = E° − (RT/nF)lnQ 把电池电动势与温度、反应物活度联系起来，说明浓度与 pH 如何改变实际电极电势。Nernst 在 1888 年导出它，是理解电池、神经电位与 pH 计的基础。
The Nernst equation E = E° − (RT/nF)lnQ links cell voltage to temperature and reactant activities, showing how concentration and pH shift real electrode potentials. Nernst derived it in 1888; it underlies batteries, nerve potentials and pH meters.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-11-03
来源 · Source
能斯特 1888 年论文；Bard 与 Faulkner《电化学方法》
Nernst (1888); Bard & Faulkner, Electrochemical Methods
独立核验依据 · Independent verification: 核验依据 1 OPENLIBRARY 标识 /works/OL17203337W：Electrochemical Method
#能斯特方程 #电极电势 #活度
为什么铝比铁更活泼却不容易继续被腐蚀，而铁锈会越锈越深？
Why does aluminum, though more reactive than iron, resist ongoing corrosion while iron rust keeps penetrating?
铝的标准电极电位比铁更负，热力学上更易被氧化；但氧化生成的 Al₂O₃ 膜致密且与基体结合牢固，立刻隔绝氧气和水，使腐蚀"自钝化"而停止。铁锈 Fe₂O₃·xH₂O 疏松多孔、容易剥落，无法阻隔环境，基体便持续被侵蚀。
Aluminum has a more negative standard potential than iron and is thermodynamically easier to oxidize, but the Al₂O₃ film it forms is dense and adheres tightly, instantly sealing off oxygen and water so corrosion self-passivates. Rust (Fe₂O₃·xH₂O) is porous and flakes off, leaving the underlying metal exposed to continued attack.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Housecroft & Sharpe,《Inorganic Chemistry》第5版,Pearson,2018
C. E. Housecroft and A. G. Sharpe, Inorganic Chemistry, 5th ed., Pearson, 2018
#铝钝化 #氧化铝膜 #铁的腐蚀 #自钝化
什么是原电池？
What is a galvanic cell?
原电池是利用自发氧化还原反应将化学能转化为电能的装置。它由两个不同的电极和电解质组成，电子经外电路从负极流向正极产生电流。伏打电堆是最早的原电池。
A galvanic cell converts chemical energy into electrical energy using a spontaneous redox reaction. It consists of two different electrodes and an electrolyte, with electrons flowing through an external circuit from the negative to the positive electrode to produce current. The Volta pile was the earliest galvanic cell.
难度 进阶 · 适合 大众
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：著录含书名，但缺版次 / 出版社 / 年份中的一部分，需编辑补全后才能做独立比对。
Atkins 与 de Paula《物理化学》（第10版，牛津大学出版社）电化学（原电池）章节
Atkins, P. W.; de Paula, J. Physical Chemistry, 10th ed., Oxford University Press (galvanic cells)
#原电池 #化学能 #电能
镀层保护利用了什么原理？
What principle does coating protection use?
镀层保护通过电镀或热镀在金属表面覆盖一层致密、耐腐蚀的金属（如锌、锡、铬），隔绝水与氧气。若镀层完整，主体金属被机械隔离而不被腐蚀。即使镀层破损，锌等更活泼金属还能提供牺牲阳极保护。
Coating protection covers a metal surface with a dense, corrosion-resistant layer such as zinc, tin or chromium by electroplating or hot-dipping, isolating it from water and oxygen. With an intact coating the base metal is mechanically shielded. Even if scratched, a more active metal like zinc still offers sacrificial protection.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-10-04
来源 · Source
Fontana, M. G. 《腐蚀工程》（第3版，McGraw-Hill）镀层保护章节, 1986
Fontana, M. G. Corrosion Engineering, 3rd ed., McGraw-Hill, 1986 (coating protection)
独立核验依据 · Independent verification: 核验依据 1 ISBN 978-0-07-100360-5 (1986, McGraw-Hill)
#镀层 #电镀 #隔离
什么是牺牲阳极法？
What is the sacrificial anode method?
牺牲阳极法是一种阴极保护技术：将更活泼的金属（如镁、锌）连接在被保护金属上，前者优先被氧化腐蚀，从而保护后者。它常用于船舶、地下管道和热水器的防锈。这种方法无需外加电源。
The sacrificial anode method is a cathodic protection technique: a more active metal such as magnesium or zinc is connected to the protected metal and oxidizes first, protecting the latter. It is used for ships, buried pipelines and water heaters. No external power supply is needed.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-10-04
来源 · Source
Fontana, M. G. 《腐蚀工程》（第3版，McGraw-Hill）阴极保护与牺牲阳极章节, 1986
Fontana, M. G. Corrosion Engineering, 3rd ed., McGraw-Hill, 1986 (cathodic protection; sacrificial anodes)
独立核验依据 · Independent verification: 核验依据 1 ISBN 978-0-07-100360-5 (1986, McGraw-Hill)
#牺牲阳极 #阴极保护 #防锈
锌片和铜片插入稀硫酸并用导线相连，为什么导线中会有电流？
A zinc plate and a copper plate are dipped in dilute sulfuric acid and connected by a wire. Why does current flow in the wire?
锌和铜的活泼性不同，在稀硫酸中就构成了原电池：锌比铜活泼，锌失电子被氧化（Zn-2e- 生成 Zn2+）成为负极，电子沿导线流到铜电极；氢离子在铜表面获得电子被还原成氢气，铜是正极并冒出气泡。电子在导线中的定向移动形成电流，化学能转化为电能。若两极直接接触短路，电子就直接传给氢离子，外电路就没有电流。
Because the two metals differ in activity, they form a galvanic (voltaic) cell in dilute sulfuric acid. Zinc is the more active metal, so it loses electrons and is oxidized (Zn - 2e⁻ → Zn²⁺) as the anode; electrons travel through the wire to the copper electrode, where H⁺ gains electrons and is reduced to hydrogen gas, so copper is the cathode and bubbles gas. The directed flow of electrons in the wire is the electric current, and chemical energy becomes electrical energy. If the two metals touch directly, electrons pass straight to the ions and no current flows through an external circuit.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：著录仅给书名，无版次与年份；同一书名常对应多个版次，不臆测具体版本。
《普通化学》（电化学）
General Chemistry (electrochemistry)
#原电池 #氧化还原 #电流
电解和原电池有什么区别？
What is the difference between electrolysis and a galvanic cell?
原电池利用自发的氧化还原反应对外供电，是化学能转电能；电解则需要外加电能驱动非自发反应，是电能转化学能。原电池的两极分别叫正负极，电解池的两极按连接电源的正负叫阴阳极。两者电子流动方向和能量转化正好相反。
A galvanic cell uses a spontaneous redox reaction to supply power, converting chemical to electrical energy; electrolysis needs external electrical energy to drive a non-spontaneous reaction, converting electrical to chemical energy. A galvanic cell's electrodes are called positive and negative, while an electrolytic cell's are cathode and anode by their connection to the power supply. Their electron flow and energy conversion are opposite.
难度 进阶 · 适合 大众
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：著录含书名，但缺版次 / 出版社 / 年份中的一部分，需编辑补全后才能做独立比对。
Atkins 与 de Paula《物理化学》（第10版，牛津大学出版社）电解与原电池对比章节
Atkins, P. W.; de Paula, J. Physical Chemistry, 10th ed., Oxford University Press (electrolysis vs galvanic cells)
#电解 #原电池 #能量转化
为什么干电池用久了会漏出粘稠的液体？
Why does a worn-out dry cell leak a sticky liquid?
老式锌锰干电池的外壳就是锌筒，它是电池的负极，使用中不断被氧化变薄。锌筒被腐蚀穿孔后，里面的电解液（氯化铵浆和二氧化锰混合物）就会渗出，形成粘稠的漏液。因此电池用完最好及时取出，尤其不要长期留在电器里，否则漏液会腐蚀接触片、损坏设备。
In a classic zinc-carbon cell the zinc can is the outer shell and the negative electrode, so it is steadily oxidized and thins during use. Once corrosion pokes a hole in it, the inner paste of ammonium chloride electrolyte and manganese dioxide seeps out as a sticky leak. Dead batteries should be removed promptly, especially from devices kept for months, because the leaked fluid corrodes the contacts and ruins the equipment.
难度 进阶 · 适合 大众
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：著录仅给书名，无版次与年份；同一书名常对应多个版次，不臆测具体版本。
《普通化学》（电化学）
General Chemistry (electrochemistry)
#干电池 #锌 #电解液
标准氢电极（SHE）的电极电势为什么被规定为0？它在电化学中有什么作用？
Why is the standard hydrogen electrode (SHE) assigned a potential of exactly 0, and what role does it play in electrochemistry?
由于电极电势的绝对值无法测定，电化学上约定将标准氢电极（2H⁺ + 2e⁻ ⇌ H2，标准状态）的电极电势定义并规定为0伏，作为比较基准。所有其他物质的标准电极电势都是相对于SHE测得的相对值，据此可判断氧化还原反应的方向与强弱。
Because absolute electrode potentials cannot be measured, electrochemistry defines the standard hydrogen electrode (2H⁺ + 2e⁻ ⇌ H2 under standard conditions) to have exactly 0 V as a reference. All other standard electrode potentials are measured relative to the SHE, allowing prediction of the direction and driving force of redox reactions.
难度 进阶 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-11-03
来源 · Source
国际纯粹与应用化学联合会（IUPAC）电化学术语；傅献彩《物理化学》
International Union of Pure and Applied Chemistry (IUPAC) electrochemistry terminology; Fu Xiancai, 'Physical Chemistry'
独立核验依据 · Independent verification: 核验依据 1 ARCHIVE 标识 jee_1755511010：Physical chemistry - Formula.p
#标准氢电极 #电极电势 #参比 #氧化还原 #基准
什么是过电位（超电势）？为什么电解水实际需要的电压远高于理论分解电压？
What is overpotential, and why does electrolyzing water require a much higher voltage than the theoretical decomposition voltage?
过电位是电极实际电位偏离其平衡（可逆）电位的额外电压损失，主要来自电极反应缓慢的动力学（活化极化）以及气泡在电极上脱离困难等。水的理论分解电压约 1.23 V，但由于析氧反应动力学极慢，实际常需 1.8–2.0 V 以上才开始明显产气。
Overpotential is the extra voltage loss when an electrode operates away from its equilibrium potential, driven mainly by sluggish reaction kinetics (activation polarization) and difficulty of bubble detachment. Water's theoretical decomposition voltage is about 1.23 V, but the slow oxygen-evolution reaction typically forces the real cell to 1.8–2.0 V or more before gas evolves appreciably.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-10-04
来源 · Source
Bard & Faulkner《电化学方法：基础与应用》（第2版），第3章
Bard & Faulkner, "Electrochemical Methods: Fundamentals and Applications" (2nd ed.), Ch.3
独立核验依据 · Independent verification: 核验依据 1 ISBN 978-0-471-04372-0 (2000, Wiley)
#过电位 #电解水 #活化极化 #析氧反应
锂离子电池充放电时，锂离子（Li⁺）在电池内部是怎么运动的？它为什么比传统电池轻便？
How do lithium ions (Li⁺) move inside a lithium-ion battery during charging and discharging, and why is the battery lighter than traditional ones?
锂离子电池充放电时，Li⁺在正负极的层状/框架材料之间来回嵌入与脱出（脱嵌），电子则经外电路做功，这一过程称为“摇椅式”机制。由于锂是密度最小、电极电势最低的金属，单位质量储能高且无需笨重的金属负极，因此电池轻巧、能量密度大。
During charge and discharge, Li⁺ ions shuttle back and forth by inserting into and extracting from layered/framework electrode materials (intercalation), while electrons do work through the external circuit—a 'rocking-chair' mechanism. Because lithium is the lightest metal with the lowest electrode potential, it stores much energy per unit mass and needs no heavy metal negative electrode, making the battery light and energy-dense.
难度 进阶 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
傅献彩 等,《物理化学》第5版,高等教育出版社,2005
Fu Xiancai et al., Physical Chemistry, 5th ed., Higher Education Press, 2005
独立核验依据 · Independent verification: 核验依据 2 DOUBAN ISBN 标识 9787040167696（按标识回读: 物理化学(第五版)上册）
#锂离子电池 #脱嵌 #摇椅式 #能量密度 #锂离子
铅酸电池的原理是什么？
How does a lead-acid battery work?
铅酸电池以二氧化铅为正极、海绵铅为负极、硫酸为电解质。放电时两极都转化为硫酸铅并消耗硫酸；充电时反应逆转恢复原状。它成本低、能大电流放电，常用于汽车启动电池。
A lead-acid battery uses lead dioxide as the positive plate, spongy lead as the negative plate and sulfuric acid as the electrolyte. During discharge both plates turn into lead sulfate and consume acid; charging reverses the reaction and restores the plates. It is cheap and delivers high current, so it is widely used as a car starter battery.
难度 进阶 · 适合 大众
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：作者 / 书名 / 版次 / 出版社 / 年份齐备，仅缺独立比对证据；已在可信度报告单列披露，不再重复核验。
Pavlov, D. 《铅酸电池：科学与技术》（Elsevier）, 2011
Pavlov, D. Lead-Acid Batteries: Science and Technology, Elsevier, 2011
#铅酸电池 #硫酸 #可充电
什么是燃料电池？
What is a fuel cell?
燃料电池是一种将燃料（如氢气）和氧化剂（如氧气）的化学能直接、持续地转化为电能的装置。它不同于一次电池，只要不断供给燃料和氧化剂就能持续发电。氢氧燃料电池的产物只有水，非常清洁。
A fuel cell directly and continuously converts the chemical energy of a fuel (such as hydrogen) and an oxidant (such as oxygen) into electricity. Unlike a primary battery, it generates power as long as fuel and oxidant are supplied. A hydrogen-oxygen fuel cell produces only water, making it very clean.
难度 进阶 · 适合 大众
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：作者 / 书名 / 版次 / 出版社 / 年份齐备，仅缺独立比对证据；已在可信度报告单列披露，不再重复核验。
O'Hayre, R.; Cha, S.-W.; Colella, W.; Prinz, F. B. 《燃料电池基础》（第2版，Wiley）, 2006
O'Hayre, R.; Cha, S.-W.; Colella, W.; Prinz, F. B. Fuel Cell Fundamentals, 2nd ed., Wiley, 2006
#燃料电池 #氢气 #清洁能源
手机里的锂离子电池为什么能充放电上千次而不报废？
Why can the lithium-ion battery in a phone be recharged thousands of times without dying?
它的核心反应是可逆的嵌入-脱嵌过程：充电时锂离子从正极脱出，穿过电解液嵌入负极石墨层间；放电时它们又返回正极。锂离子只是来回搬家，电极骨架保持完整，所以反应能反复进行。当然每次循环都会损失一点点容量，几千次后容量明显下降，才需要更换电池。
Its key reaction is the reversible intercalation and de-intercalation of lithium ions: while charging, Li⁺ leaves the cathode, migrates through the electrolyte and slots into the graphite layers of the anode; while discharging, it moves back. Because the ions simply commute while the electrode frameworks stay intact, the reaction can repeat over and over. Each cycle does lose a little capacity, so after thousands of cycles the battery is visibly weaker and needs replacing.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
傅献彩 等,《物理化学》第5版,高等教育出版社,2005
Fu Xiancai et al., Physical Chemistry, 5th ed., Higher Education Press, 2005
独立核验依据 · Independent verification: 核验依据 2 DOUBAN ISBN 标识 9787040167696（按标识回读: 物理化学(第五版)上册）
#锂离子电池 #嵌入 #可逆反应
原电池是怎样把化学能变成电能的？
How does a galvanic cell convert chemical energy into electricity?
原电池利用自发氧化还原反应，把氧化半反应和还原半反应分置两电极，电子经外电路从负极流向正极形成电流。例如丹尼尔电池中锌被氧化、铜离子被还原，盐桥维持电荷平衡。总反应的自由能下降转化为电功。
A galvanic cell uses a spontaneous redox reaction, placing oxidation and reduction at separate electrodes so electrons flow through an external circuit from anode to cathode as current. In the Daniell cell, zinc is oxidized and copper ions reduced, with a salt bridge balancing charge. The reaction's free-energy drop becomes electrical work.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
傅献彩 等,《物理化学》第5版,高等教育出版社,2005
Fu Xiancai et al., Physical Chemistry, 5th ed., Higher Education Press, 2005
独立核验依据 · Independent verification: 核验依据 2 DOUBAN ISBN 标识 9787040167696（按标识回读: 物理化学(第五版)上册）
#原电池 #氧化还原反应 #丹尼尔电池
什么是锂电池？
What is a lithium battery?
锂电池以锂或锂化合物作为电极活性物质，依靠锂离子在正负极之间嵌入和脱出来储存与释放电能。它能量密度高、自放电小、寿命长，广泛用于手机和电动车。锂离子电池是可充电的二次电池。
A lithium battery uses lithium or lithium compounds as electrode materials, storing and releasing energy as lithium ions move into and out of the electrodes. It offers high energy density, low self-discharge and long life, and is widely used in phones and electric vehicles. The lithium-ion battery is a rechargeable secondary cell.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-11-02
来源 · Source
Tarascon, J.-M.; Armand, M. 《可充电锂电池面临的挑战》，《Nature》, 2001
Tarascon, J.-M.; Armand, M. 'Issues and Challenges Facing Rechargeable Lithium Batteries,' Nature, 2001, 414, 359–367
独立核验依据 · Independent verification: 核验依据 1 CROSSREF 标识 10.1038/35104644：Issues and challenges facin
#锂电池 #锂离子 #二次电池
燃料电池与普通电池有何不同？
How does a fuel cell differ from an ordinary battery?
普通电池把反应物储存在内部，电量耗尽需充电或更换；燃料电池则持续从外部供给燃料（如氢气）和氧化剂（如氧气），不断发电，只排放水。它能量转化效率高、无燃烧，是清洁电源方向之一。
Ordinary batteries store reactants internally and need recharging or replacement when depleted; a fuel cell continuously receives fuel (e.g., hydrogen) and oxidant (e.g., oxygen) from outside, generating electricity and emitting only water. With high efficiency and no combustion, it is a clean power option.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
傅献彩 等,《物理化学》第5版,高等教育出版社,2005
Fu Xiancai et al., Physical Chemistry, 5th ed., Higher Education Press, 2005
独立核验依据 · Independent verification: 核验依据 2 DOUBAN ISBN 标识 9787040167696（按标识回读: 物理化学(第五版)上册）
#燃料电池 #氢气 #清洁电源
金属生锈（腐蚀）是电化学过程吗？
Is metal rusting (corrosion) an electrochemical process?
是的，钢铁腐蚀是典型的电化学过程：在潮湿表面形成微电池，铁作阳极失去电子被氧化成 Fe²⁺，氧在阴极被还原，产物进一步生成铁锈（水合氧化铁）。盐水和酸性环境会加速这一过程。涂漆、镀锌则是阻断电解质接触来防锈。
Yes—steel corrosion is a classic electrochemical process: moisture forms microcells where iron acts as anode, losing electrons to Fe²⁺, while oxygen is reduced at the cathode, eventually forming hydrated iron oxide (rust). Saltwater and acidity accelerate it. Painting or galvanizing blocks electrolyte contact to prevent it.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
傅献彩 等,《物理化学》第5版,高等教育出版社,2005
Fu Xiancai et al., Physical Chemistry, 5th ed., Higher Education Press, 2005
独立核验依据 · Independent verification: 核验依据 2 DOUBAN ISBN 标识 9787040167696（按标识回读: 物理化学(第五版)上册）
#金属腐蚀 #电化学 #铁锈
什么是金属的腐蚀与防护？
What are metal corrosion and its protection?
金属腐蚀是金属与周围环境发生化学或电化学反应而被破坏的过程，主要以电化学腐蚀为主。防护方法包括涂覆保护层、镀层、阴极保护和添加缓蚀剂。牺牲阳极法就是利用更活泼金属先被腐蚀来保护主体。
Corrosion is the destruction of a metal by chemical or electrochemical reaction with its environment, mainly electrochemical. Protection methods include coatings, plating, cathodic protection and corrosion inhibitors. The sacrificial anode method uses a more active metal to corrode first and protect the main structure.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-10-04
来源 · Source
Fontana, M. G. 《腐蚀工程》（第3版，McGraw-Hill）, 1986
Fontana, M. G. Corrosion Engineering, 3rd ed., McGraw-Hill, 1986
独立核验依据 · Independent verification: 核验依据 1 ISBN 978-0-07-100360-5 (1986, McGraw-Hill)
#腐蚀 #防护 #阴极保护
为什么铁会生锈？
Why does iron rust?
铁在潮湿空气中与氧气发生电化学腐蚀，生成红棕色的氧化铁（铁锈）。水和盐分都会加速这个过程，所以海边的铁更易生锈。
Iron undergoes electrochemical corrosion with oxygen in moist air, forming reddish-brown iron oxide (rust). Water and salt speed up the process, so iron near the sea rusts faster.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
傅献彩 等,《物理化学》第5版,高等教育出版社,2005
Fu Xiancai et al., Physical Chemistry, 5th ed., Higher Education Press, 2005
独立核验依据 · Independent verification: 核验依据 2 DOUBAN ISBN 标识 9787040167696（按标识回读: 物理化学(第五版)上册）
#铁锈 #腐蚀 #氧气
电池的正负极如何判断？
How do you identify the positive and negative electrodes of a battery?
在原电池中，发生氧化、流出电子的一极是负极（阳极），发生还原、流入电子的一极是正极（阴极）。对外电路而言电流从正极流出、经用电器回到负极。电压较高、标注+号的一般为正极。
In a galvanic cell, the electrode where oxidation occurs and electrons leave is the negative electrode (anode); the one where reduction occurs and electrons enter is the positive electrode (cathode). In the external circuit, current flows from the positive terminal through the load back to the negative. The higher-voltage, + labeled terminal is generally positive.
难度 进阶 · 适合 大众
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：著录含书名，但缺版次 / 出版社 / 年份中的一部分，需编辑补全后才能做独立比对。
Atkins 与 de Paula《物理化学》（第10版，牛津大学出版社）电化学（电极判断）章节
Atkins, P. W.; de Paula, J. Physical Chemistry, 10th ed., Oxford University Press (electrode identification)
#电池 #正负极 #电极
什么是电解质与非电解质的导电本质区别？
What is the essential difference in conduction between electrolytes and non-electrolytes?
电解质导电依靠溶液中自由移动的离子，而金属导电依靠电子，二者载流子不同。非电解质溶于水不离解成离子，因此不导电。区分二者可通过测定溶液是否能在电场下载流来判断。
Electrolytes conduct via freely moving ions in solution, whereas metals conduct via electrons; the charge carriers differ. A non-electrolyte does not dissociate into ions in water and therefore does not conduct. The distinction is made by whether the solution can carry current under an electric field.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：著录含书名，但缺版次 / 出版社 / 年份中的一部分，需编辑补全后才能做独立比对。
Atkins 与 de Paula《物理化学》（第10版，牛津大学出版社）电化学（电解质与非电解质导电）章节
Atkins, P. W.; de Paula, J. Physical Chemistry, 10th ed., Oxford University Press (conduction by electrolytes vs non-electrolytes)
#导电 #离子 #电子
标准还原电势的正负代表什么？
What do positive or negative standard reduction potentials signify?
标准还原电势 E° 以标准氢电极（0 V）为基准，越正表示该物质越易被还原（强氧化剂），越负表示其还原态越易被氧化（强还原剂）。两半反应的 E° 差决定电池能否自发。
Standard reduction potentials E° use the standard hydrogen electrode (0 V) as reference; more positive means the species is more easily reduced (strong oxidant), more negative means its reduced form is easily oxidized (strong reductant). The E° difference of two half-reactions determines spontaneity.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
傅献彩 等,《物理化学》第5版,高等教育出版社,2005
Fu Xiancai et al., Physical Chemistry, 5th ed., Higher Education Press, 2005
独立核验依据 · Independent verification: 核验依据 2 DOUBAN ISBN 标识 9787040167696（按标识回读: 物理化学(第五版)上册）
#还原电势 #氧化剂 #基准
为什么海水中的钢铁更易腐蚀？
Why does steel corrode faster in seawater?
海水中含有大量氯化钠等电解质，显著提高了溶液导电性，加速电化学腐蚀的电池回路。盐分还破坏金属表面的保护膜，形成差异充气等局部腐蚀电池。因此海洋环境中的钢铁腐蚀远快于淡水中。
Seawater contains abundant electrolytes such as sodium chloride, greatly raising conductivity and accelerating the electrochemical corrosion circuit. Salt also breaks the protective film and forms local corrosion cells like differential aeration. Steel therefore corrodes much faster in seawater than in fresh water.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-10-04
来源 · Source
Fontana, M. G. 《腐蚀工程》（第3版，McGraw-Hill）海水腐蚀章节, 1986
Fontana, M. G. Corrosion Engineering, 3rd ed., McGraw-Hill, 1986 (corrosion in seawater)
独立核验依据 · Independent verification: 核验依据 1 ISBN 978-0-07-100360-5 (1986, McGraw-Hill)
#海水 #腐蚀 #电解质
燃料电池同样是在烧氢气或甲醇，为什么它的能量利用效率比普通燃烧高？
Fuel cells burn hydrogen or methanol too, so why are they far more efficient than ordinary combustion?
普通燃烧先把化学能变成热能，再经热机转成机械功，受卡诺效率限制，大量热量被排掉；燃料电池则让燃料在电极上直接发生氧化还原反应，电子经外电路流动产生电能，化学能一步变成电能，不受卡诺循环限制。因此氢气燃料电池的理论效率可达80%以上，远高于内燃机的30%左右。它本质上是一个不断进食燃料的原电池，只要持续供气就能一直发电。
Ordinary combustion first turns chemical energy into heat, then a heat engine converts that heat into work, and Carnot efficiency caps how much survives. A fuel cell instead runs the fuel's redox reaction directly at the electrodes, so electrons stream through an external circuit and chemical energy becomes electricity in one step, outside the Carnot limit. That is why a hydrogen fuel cell can exceed 80% theoretical efficiency versus about 30% for an internal combustion engine. A fuel cell is essentially a galvanic cell that keeps being fed fuel and generates power as long as gases are supplied.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
傅献彩 等,《物理化学》第5版,高等教育出版社,2005
Fu Xiancai et al., Physical Chemistry, 5th ed., Higher Education Press, 2005
独立核验依据 · Independent verification: 核验依据 2 DOUBAN ISBN 标识 9787040167696（按标识回读: 物理化学(第五版)上册）
#燃料电池 #效率 #化学能
把零件挂进电镀槽接通电流后，镍或铬为什么会均匀地「长」在零件表面？
Once a workpiece hangs in a plating bath with the current switched on, why does nickel or chromium grow evenly across its surface?
这是靠阴极还原沉积实现的。直流电源把零件变成阴极，槽液里的金属离子游向零件表面夺取电子，还原成中性原子并嵌入晶格逐层析出，镀层随之增厚：每个镍离子得到两个电子变成金属镍，铬酐镀液中的六价铬则经多步还原落到表面。阳极因镀种而异：镀镍用可溶性镍板补离子，镀铬则用铅基不溶性阳极并补加铬酐。电流密度、温度与添加剂调控成核和长大的速度，从而决定镀层的致密程度、光泽与结合力。
The trick is cathodic reduction and deposition. The DC supply turns the workpiece into the cathode; metal ions in the bath migrate to its surface, capture electrons, and are reduced to neutral atoms that settle into the crystal lattice layer by layer, thickening the coating. Each nickel ion takes up two electrons to become metal, while hexavalent chromium from chromic-acid baths reaches the surface through several reduction steps. Anode practice differs by bath: nickel plating dissolves soluble nickel slabs to replenish ions, while chromium plating runs insoluble lead-based anodes topped up with chromic acid. Current density, temperature and additives control how fast nuclei form and grow, setting the coating density, brightness and adhesion.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-11-03
来源 · Source
M. Schlesinger 与 M. Paunovic 主编，《现代电镀（Modern Electroplating）》第5版，Wiley，2010
M. Schlesinger and M. Paunovic, eds., Modern Electroplating, 5th edition, Wiley, 2010
独立核验依据 · Independent verification: 核验依据 1 OPENLIBRARY 标识 /works/OL15537686W：Modern electroplating（
#电镀 #阴极还原 #电结晶
电解水时为什么阴极出氢气、阳极出氧气且体积约2:1？
Why does water electrolysis give H2 at the cathode, O2 at the anode, in a ~2:1 ratio?
水离解成H+和OH-，阴极还原出氢气、阳极氧化出氧气。按反应计量，每生成1份氧气对应2份氢气，故体积比约2:1。
Water yields H+ and OH-; the cathode reduces H2, the anode oxidizes O2. Stoichiometry gives 2 volumes of H2 per 1 of O2, so the ratio is ~2:1.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Brown, LeMay 等,《Chemistry: The Central Science》第14版,Pearson,2017
T. L. Brown et al., Chemistry: The Central Science, 14th ed., Pearson, 2017
#电解水 #氢气 #氧气
埋在地下的钢管为什么往往比露在空气中的腐蚀得更快？
Why do buried steel pipes often corrode faster than steel exposed to air?
钢铁在空气里生锈需要水膜，而地下土壤本身就是潮湿的电解质，为电化学腐蚀创造了更有利的条件。土壤中不同部位的氧含量、酸碱度和盐分不同，会在钢管各区段形成氧浓差电池或微电池：氧多的地方是阴极，氧少的地方成为阳极而加速溶解。土壤越湿、含盐越高，导电性越好，腐蚀电流越大，所以埋地管道要涂防腐层并配合阴极保护。
Steel rusts in air only with a water film, while damp soil is itself an electrolyte that favours electrochemical corrosion. Differences in oxygen content, acidity and salinity across the soil create oxygen-concentration cells and micro-cells on different sections of the pipe: oxygen-rich zones act as cathodes while oxygen-poor zones become anodes and dissolve faster. The wetter and saltier the soil, the better it conducts and the stronger the corrosion current - which is why buried pipelines get protective coatings plus cathodic protection.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：著录仅给书名，无版次与年份；同一书名常对应多个版次，不臆测具体版本。
《普通化学》（金属腐蚀）
General Chemistry (corrosion)
#电化学腐蚀 #土壤 #氧浓差电池
什么是腐蚀和防护？
What are corrosion and its protection?
腐蚀是金属与环境发生化学或电化学反应而损耗，最常见的是铁生锈。防护方法包括涂漆、镀层、使用不锈钢和牺牲阳极保护法。
Corrosion is the loss of metal through chemical or electrochemical reaction with the environment, with rusting iron being the most common. Protection includes painting, coating, stainless steel, and sacrificial anode methods.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
傅献彩 等,《物理化学》第5版,高等教育出版社,2005
Fu Xiancai et al., Physical Chemistry, 5th ed., Higher Education Press, 2005
独立核验依据 · Independent verification: 核验依据 2 DOUBAN ISBN 标识 9787040167696（按标识回读: 物理化学(第五版)上册）
#腐蚀 #防护 #涂层
电解水时发生了什么反应？
What reactions happen during water electrolysis?
通电后阴极发生 2H₂O+2e⁻→H₂+2OH⁻，阳极发生 2H₂O→O₂+4H⁺+4e⁻，总反应把水分解为氢和氧。该过程证明水是化合物，也是制取绿氢的核心技术。
On electrolysis the cathode does 2H₂O+2e⁻→H₂+2OH⁻ and the anode 2H₂O→O₂+4H⁺+4e⁻, overall splitting water into hydrogen and oxygen. It proves water is a compound and underlies green-hydrogen production.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-11-03
来源 · Source
Bard 与 Faulkner《电化学方法》；Atkins《物理化学》
Bard & Faulkner, Electrochemical Methods; Atkins, Physical Chemistry
独立核验依据 · Independent verification: 核验依据 1 OPENLIBRARY 标识 /works/OL17203337W：Electrochemical Method
#电解水 #析氢 #析氧
标准电极电势表能告诉我们什么？
What does a table of standard electrode potentials tell us?
标准电极电势（E°）衡量半反应在标准状态下得电子的趋势，数值越正越容易被还原。通过比较两电对的 E°，可判断氧化还原反应自发方向及电池电压。例如 E°(F₂/F⁻) 很高，说明氟是最强氧化剂之一。
Standard electrode potential (E°) measures a half-reaction's tendency to gain electrons under standard conditions; the more positive, the easier reduction. Comparing two E° values predicts a redox reaction's spontaneity and cell voltage. For example, E°(F₂/F⁻) is very high, marking fluorine among the strongest oxidants.
难度 进阶 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
傅献彩 等,《物理化学》第5版,高等教育出版社,2005
Fu Xiancai et al., Physical Chemistry, 5th ed., Higher Education Press, 2005
独立核验依据 · Independent verification: 核验依据 2 DOUBAN ISBN 标识 9787040167696（按标识回读: 物理化学(第五版)上册）
#标准电极电势 #氧化性 #还原
电化学测量中为什么要使用"参比电极"（如饱和甘汞电极）？它起什么作用？
Why is a "reference electrode" (such as the saturated calomel electrode) used in electrochemical measurements, and what does it do?
测一个工作电极的电位必须有一个已知且稳定的基准与之配对，参比电极就提供这个恒定不变的电位。例如饱和甘汞电极（SCE，约 +0.241 V vs 标准氢电极）不受待测溶液组成影响，使测得的电池电动势只反映工作电极的变化。
Measuring one electrode's potential requires a stable, known benchmark paired with it, which the reference electrode supplies. The saturated calomel electrode (SCE, about +0.241 V vs SHE), for instance, is unaffected by the test solution, so the measured cell emf reflects only the working electrode.
难度 进阶 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-10-04
来源 · Source
Bard & Faulkner《电化学方法：基础与应用》（第2版），第2章
Bard & Faulkner, "Electrochemical Methods: Fundamentals and Applications" (2nd ed.), Ch.2
独立核验依据 · Independent verification: 核验依据 1 ISBN 978-0-471-04372-0 (2000, Wiley)
#参比电极 #甘汞电极 #标准氢电极 #电位测量
法拉第电解定律（Faraday's laws）的内容是什么？它对电解工业有何意义？
What do Faraday's laws of electrolysis state, and why are they important to the electrolysis industry?
法拉第第一定律：电解时在电极上析出物质的质量与通过的电量成正比；第二定律：相同电量下析出不同物质的量与它们的化学当量（摩尔质量/电子数）成正比。据此可由电量精确计算产物量，是电解、电镀等工业定量控制的理论基础。
Faraday's first law states that the mass of substance deposited at an electrode is proportional to the charge passed; the second law states that for the same charge, the amount of different substances deposited is proportional to their chemical equivalent (molar mass divided by electrons transferred). This lets industry calculate product amounts precisely from charge, underpinning electrolysis and electroplating.
难度 进阶 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-11-02
来源 · Source
M. 法拉第《电的化学分解》（1834）；傅献彩《物理化学》
M. Faraday, 'Experimental Researches in Electricity' (1834); Fu Xiancai, 'Physical Chemistry'
独立核验依据 · Independent verification: 核验依据 1 CROSSREF 标识 10.1017/cbo9781139383158：Experimental Resear
#法拉第定律 #电解 #电量 #当量 #电镀
为什么湿手碰电更危险？
Why is touching electricity with wet hands more dangerous?
手上的汗水和水含有盐分，是能导电的电解质，会大大降低皮肤电阻。电流更容易通过身体，所以湿手触电更危险。
Sweat and water on the hands contain salts, which are conductive electrolytes that greatly lower skin resistance. Current passes through the body more easily, so wet-hand shocks are more dangerous.
难度 入门 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
傅献彩 等,《物理化学》第5版,高等教育出版社,2005
Fu Xiancai et al., Physical Chemistry, 5th ed., Higher Education Press, 2005
独立核验依据 · Independent verification: 核验依据 2 DOUBAN ISBN 标识 9787040167696（按标识回读: 物理化学(第五版)上册）
#湿手 #电解质 #导电
电池是怎么产生电的？
How does a battery produce electricity?
电池内部发生化学反应，使电子从负极流向正极，形成电流。不同金属和电解液的搭配决定了电压大小。
Inside a battery, a chemical reaction drives electrons to flow from the negative to the positive terminal, creating an electric current. The choice of metals and electrolyte determines the voltage.
难度 入门 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
傅献彩 等,《物理化学》第5版,高等教育出版社,2005
Fu Xiancai et al., Physical Chemistry, 5th ed., Higher Education Press, 2005
独立核验依据 · Independent verification: 核验依据 2 DOUBAN ISBN 标识 9787040167696（按标识回读: 物理化学(第五版)上册）
#电池 #电流 #化学反应
盐水能导电吗？
Can salt water conduct electricity?
可以。食盐溶解后会电离出钠离子和氯离子，这些带电离子能在水中自由移动，把电流传递过去。纯水几乎不导电，但盐水可以。
Yes. When salt dissolves it releases sodium and chloride ions that move freely in water and carry electric current. Pure water barely conducts, but salt water does.
难度 入门 · 适合 小学高段(9-12)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
傅献彩 等,《物理化学》第5版,高等教育出版社,2005
Fu Xiancai et al., Physical Chemistry, 5th ed., Higher Education Press, 2005
独立核验依据 · Independent verification: 核验依据 2 DOUBAN ISBN 标识 9787040167696（按标识回读: 物理化学(第五版)上册）
#盐水 #离子 #导电
为什么手电筒电池放久了会没电？
Why do flashlight batteries die if left too long?
电池里的化学物质会随时间缓慢反应或自放电，把存储的化学能逐渐消耗掉。即使不用，内部的反应也会让电量慢慢减少。
The chemicals inside a battery slowly react or self-discharge over time, gradually using up the stored chemical energy. Even when unused, internal reactions slowly reduce the charge.
难度 入门 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
傅献彩 等,《物理化学》第5版,高等教育出版社,2005
Fu Xiancai et al., Physical Chemistry, 5th ed., Higher Education Press, 2005
独立核验依据 · Independent verification: 核验依据 2 DOUBAN ISBN 标识 9787040167696（按标识回读: 物理化学(第五版)上册）
#电池 #自放电 #化学能
电解质溶液如何导电？
How does an electrolyte solution conduct electricity?
电解质溶于水后电离出正、负离子，在外加电场作用下离子分别向两极定向移动，形成电流。溶液导电能力取决于离子浓度和离子所带电荷数。纯水和多数有机物溶液几乎不导电。
When an electrolyte dissolves, it ionizes into positive and negative ions that migrate toward the electrodes under an applied electric field, carrying current. Conductivity depends on ion concentration and the charges they carry. Pure water and most organic solutions barely conduct.
难度 入门 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-11-03
来源 · Source
Brown、LeMay、Bursten 等《化学：中心科学》（第14版，Pearson）电解质溶液导电章节
Brown, T. L.; LeMay, H. E.; Bursten, B. E.; et al. Chemistry: The Central Science, 14th ed., Pearson (electrolyte conduction)
独立核验依据 · Independent verification: 核验依据 1 ARCHIVE 标识 studentlectureno00theo：Chemistry, the central
#电解质 #离子 #导电
在电池里，阳极和阴极、正极和负极为什么在原电池和电解池中是反着称呼的？
Why are the labels "anode" and "cathode" assigned oppositely in a galvanic cell versus an electrolytic cell?
阳极永远是发生氧化（失电子）的电极，阴极永远是发生还原（得电子）的电极，这个命名只取决于反应类型，与带电正负无关。在原电池中阳极恰好是负极（电子流出的一端），而在电解池中阳极接电源正极、反而成了正极，所以两类装置里阴阳极与正负极的对应关系正好相反。
The anode is always the electrode where oxidation occurs and the cathode always where reduction occurs; the names depend only on the reaction type, not on charge. In a galvanic cell the anode is the negative terminal, but in an electrolytic cell it is connected to the positive supply, so the anode/cathode-to-positive/negative relationship is reversed between the two setups.
难度 入门 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-10-04
来源 · Source
Bard & Faulkner《电化学方法：基础与应用》（第2版），第1章电极术语
Bard & Faulkner, "Electrochemical Methods: Fundamentals and Applications" (2nd ed.), Ch.1
独立核验依据 · Independent verification: 核验依据 1 ISBN 978-0-471-04372-0 (2000, Wiley)
#阳极 #阴极 #原电池 #电解池 #电极命名
为什么在钢质船壳上镶锌块，船体就不容易生锈？
Why do ships bolt blocks of zinc onto their steel hulls to keep them from rusting?
这靠的是牺牲阳极的阴极保护法。锌的标准电极电位（约-0.76伏）比铁（约-0.44伏）低，两者在海水里构成原电池后，锌作为负极优先发生氧化而溶解，放出的电子源源不断流向船壳，使壳体表面富余电子，铁原子难以失去电子变成离子，于是船体充当受保护的阴极而停止锈蚀。锌块消耗殆尽时换上新块，保护得以延续。
They act as sacrificial anodes. Zinc sits below iron on the electrochemical series, so in seawater the two metals form a galvanic couple in which zinc oxidizes and dissolves first. The electrons it releases flow into the hull and keep the steel electron-rich, preventing iron atoms from leaving as ions; the hull behaves as a protected cathode. Periodically replacing the worn zinc blocks keeps the protection going.
难度 入门 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-11-02
来源 · Source
曹楚南，《腐蚀电化学原理》（第3版），化学工业出版社，2004 ; 另见: R. W. Revie and H. H. Uhlig, Corrosion and Corrosion Control, 4th edition, Wiley, 2008
R. W. Revie and H. H. Uhlig, Corrosion and Corrosion Control, 4th edition, Wiley, 2008 ; see also: 曹楚南，《腐蚀电化学原理》（第3版），化学工业出版社，2004
独立核验依据 · Independent verification: 核验依据 1 OPENLIBRARY 标识 /works/OL13487131W：Corrosion and corrosio
#牺牲阳极 #阴极保护 #原电池腐蚀
干电池（锌锰电池）的原理是什么？
How does a dry cell (zinc-carbon battery) work?
干电池以锌壳为负极、二氧化锰为正极材料、氯化铵为电解质。放电时锌被氧化失去电子，二氧化锰被还原，电子经外电路从负极流向正极产生电流。干电池是一次电池，通常不能反复充电。
A dry cell uses a zinc shell as the negative electrode, manganese dioxide as the positive material and ammonium chloride as the electrolyte. During discharge, zinc is oxidized and loses electrons while manganese dioxide is reduced, and electrons flow through the external circuit to produce current. It is a primary battery and usually cannot be recharged.
难度 入门 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-11-03
来源 · Source
Brown、LeMay、Bursten 等《化学：中心科学》（第14版，Pearson）电化学与原电池（干电池）章节
Brown, T. L.; LeMay, H. E.; Bursten, B. E.; et al. Chemistry: The Central Science, 14th ed., Pearson (electrochemistry; dry cells)
独立核验依据 · Independent verification: 核验依据 1 ARCHIVE 标识 studentlectureno00theo：Chemistry, the central
#干电池 #锌锰电池 #一次电池