Electrolysis of Water

2H2O → 2H2 + O2

概要

An electric current passed through water splits it into hydrogen gas at the cathode and oxygen gas at the anode. The minimum voltage required is 1.23 V (thermodynamic), but practical electrolyzers operate at 1.8–2.0 V due to overpotential. A small amount of electrolyte (acid, base, or salt) is needed to make water conductive.

参加者

役割 物質 係数 状態
反応物 Water H₂O 2 (l)

日常の例

Green hydrogen production uses renewable electricity to electrolyze water, producing clean fuel for vehicles and industry.

産業上の重要性

水電解は世界の水素の約4%を製造する。再生可能エネルギーからのグリーン水素は急速に成長しており、2050年までに主要な電力貯蔵・脱炭素化手段となることが期待されている。

Frequently Asked Questions

What is the equation for Electrolysis of Water?
The balanced equation is: 2H₂O → 2H₂ + O₂.
What type of reaction is Electrolysis of Water?
Electrolysis of Water is a electrochemical reaction. It is reversible under certain conditions.
Is Electrolysis of Water exothermic or endothermic?
Electrolysis of Water is endothermic (absorbs energy). The enthalpy change (ΔH) is 572.0 kJ/mol.