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Electrolysis GK Guide: Faraday Laws, Water Splitting & Green Hydrogen Technologies
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In physical chemistry and industrial electrochemistry, electrolysis is a chemical process that employs direct electrical current (DC) to drive an otherwise non-spontaneous oxidation-reduction (redox) reaction within an ionic solution or molten electrolyte. First discovered in May 1800 by English scientists William Nicholson and Anthony Carlisle, who utilized Alessandro Volta's newly invented electric battery to split water into its constituent elements, electrolysis provides the foundational electrochemical mechanism for metallic refining, electroplating, and renewable fuel manufacturing. The quantitative relationships governing the process were systematically codified in 1834 by British polymath Michael Faraday in his celebrated Two Laws of Electrolysis, linking electric charge passage directly to deposited chemical mass.
The operational mechanics of water electrolysis involve the decomposition of liquid water molecules into gaseous hydrogen and gaseous oxygen through coupled, simultaneous half-reactions occurring at opposing electrodes immersed in an electrically conductive medium. At standard temperature and pressure, the thermodynamic splitting of water requires an endothermic input with an enthalpy change of 285.8 kilojoules per mole and a theoretical minimum reversible potential of 1.23 volts. In an operational electrolytic cell, pure water is an exceptionally poor electrical conductor due to its negligible self-ionization; consequently, strong electrolytes such as dilute sulfuric acid or potassium hydroxide are introduced to supply free charge-carrying ions without decomposing themselves during charge transport.
During water electrolysis, the continuous application of direct electric current establishes distinct half-cell reactions at the cathode and anode. At the negatively charged cathode, reduction takes place as hydrogen ions (or water molecules in alkaline media) gain electrons through the Hydrogen Evolution Reaction to form diatomic hydrogen gas (2H++2e−→H2​). Simultaneously, at the positively charged anode, oxidation occurs through the Oxygen Evolution Reaction as water molecules surrender electrons to form diatomic oxygen gas and protons (2H2​O→O2​+4H++4e−). In adherence to Avogadro's law and water's molecular stoichiometry (H2​O), the volume of hydrogen gas liberated at the cathode is exactly twice the volume of oxygen gas evolved at the anode. In modern clean energy architectures, water electrolysis powered by solar or wind electricity produces Green Hydrogen, forming the primary technological foundation of India's National Green Hydrogen Mission.
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