Electrolysis of Water
2H2O → 2H2 + O2
Обзор
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.
Участники
| Роль | Вещество | Коэффициент | Состояние |
|---|---|---|---|
| Реагент | Water H₂O | 2 | (l) |
Пример из жизни
Green hydrogen production uses renewable electricity to electrolyze water, producing clean fuel for vehicles and industry.
Промышленное значение
Water electrolysis produces about 4% of the world's hydrogen. Green hydrogen from electrolysis is projected to reach $1.5/kg by 2030.
Свойства
- Тип
- Electrochemical
- Обратимая
- Да
- Энергия
- Эндотермическая
- ΔH
- 572,0 kJ/mol
Связанные реакции
Alkaline Battery Discharge
Anodizing of Aluminum
Chlor-Alkali Electrolysis
Nickel-Metal Hydride Battery
Daniell Cell (Zinc-Copper Galvanic Cell)
Electrolysis of Molten NaCl (Downs Process)
Lead-Acid Battery Discharge
Hall-Héroult Process (Aluminum Smelting)
Electrowinning of Zinc
Electrorefining of Copper
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.