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

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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.