What are Green Hydrogen Electrolysers?

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Prelims: Science & Technology
What are Green Hydrogen Electrolysers? Blog Image

About Green Hydrogen Electrolysers:

  • Hydrogen electrolysers are devices that use electricity to split water into hydrogen and oxygen.
  • When electricity input to the electrolyser is obtained from renewable sources like wind and solar, then the hydrogen produced is called green hydrogen.
  • Typically, electrolysers consume 50-55 kilowatt-hours or units of electricity to produce one kilogram of hydrogen.
  • Electrolysers produce hydrogen at about 50-90 degree Celsius and at a pressure of 30-50 bar.
  • Electrolysers are commercially available at a size of a few kilowatts (kW) to megawatts (MW).


What are the different electrolyser technologies?

  • There are various electrolyser technologies available currently.
  • Alkaline electrolysers and polymer electrolyte membrane (PEM) electrolysers are commercially available technologies.
  • Alkaline electrolysers use liquid alkaline electrolyte solution of sodium or potassium hydroxide while PEM electrolysers are based on solid polymer membrane.
  • In addition to these, there are other proprietary technologies like electrochemical, thermally-activated chemical (E-TAC) and anion exchange membrane (AEM) that claim to be more efficient than existing technology options.


Q1) What is India's National Green Hydrogen Mission?

The National Green Hydrogen Mission was approved by the Union Cabinet on 4 January 2022, with the intended objectives of: Making India a leading producer and supplier of Green Hydrogen in the world & Creation of export opportunities for Green Hydrogen and its derivatives.

Source: The Hindu