Thermodynamics aspect of high pressure hydrogen production by water electrolysis

Hydrogen can be produced from water electrolysis which can operate at atmospheric
pressure or high pressure. Today’s industry including vehicle one, devotes efforts to produce high
pressure hydrogen by using pressurized electrolyser. The purpose of this work is to estimate the ideal
electrical energy needed for high pressure hydrogen under high pressure water electrolysis
conditions. Calculations are based on the estimation of the enthalpy and free Gibbs energy of water
electrolysis at various pressures and temperatures, referring to both the work of LeRoy & Onda.