Lead Dioxide and Sulfuric Acid (Lead-Acid Battery Discharge)

PbO2 + Pb + 2H2SO4 → 2PbSO4 + 2H2O

概述

During discharge, lead dioxide (cathode, Pb⁴⁺) is reduced to lead sulfate while lead metal (anode, Pb⁰) is oxidized to lead sulfate. Both electrodes convert to PbSO₄, and the sulfuric acid electrolyte is consumed. The cell potential is 2.05 V. Charging reverses the reaction.

参与者

角色 物质 系数 状态
反应物 Lead Pb 1 (s)
反应物 Sulfuric Acid H₂SO₄ 2 (aq)
产物 Water H₂O 2 (l)

日常示例

Every car battery is a lead-acid battery using this reversible redox reaction. Starting your car draws hundreds of amps from this reaction.

工业重要性

铅酸蓄电池是一个逾400亿美元的全球产业，用于汽车启动、UPS系统和通信基站储能，铅回收率超99%，是最成熟的储能与回收循环体系。

属性

类型
Redox
可逆
是
能量
放热
ΔH
-359.4 kJ/mol

相关反应

Iron(II) to Iron(III) Oxidation by Oxygen Bleaching with Sodium Hypochlorite Copper Reduction of Silver Ion Aqua Regia Dissolving Gold Cerium(IV) Reduction by Iron(II) Copper Oxidation by Nitric Acid Hypochlorite Oxidation of Hydrogen Peroxide Hydrogen Peroxide as Oxidizing Agent (Acidic) Hydrogen Peroxide Disproportionation Displacement of Hydrogen from Acid by Magnesium

Frequently Asked Questions

What is the equation for Lead Dioxide and Sulfuric Acid (Lead-Acid Battery Discharge)?
The balanced equation is: PbO₂ + Pb + 2H₂SO₄ → 2PbSO₄ + 2H₂O.
What type of reaction is Lead Dioxide and Sulfuric Acid (Lead-Acid Battery Discharge)?
Lead Dioxide and Sulfuric Acid (Lead-Acid Battery Discharge) is a redox reaction. It is reversible under certain conditions.
Is Lead Dioxide and Sulfuric Acid (Lead-Acid Battery Discharge) exothermic or endothermic?
Lead Dioxide and Sulfuric Acid (Lead-Acid Battery Discharge) is exothermic (releases energy). The enthalpy change (ΔH) is -359.4 kJ/mol.