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What is it?

Water is split into hydrogen and oxygen via the application of an electric current, using a porous diaphragm and an alkaline electrolyte.

Why is it important?

Alkaline electrolysis is an established technology which is already being employed at industrial scale.


  • Inputs: Water, electricity
  • By-products: Oxygen
  • Operating temperature: <100°C
  • Energy efficiency: ~69%


  • Well established supply chain and manufacturing capacity
  • Large stack sizes available
  • Long-term stability
  • Low capital cost
  • Non-noble materials
  • Mature technology
  • Large stack sizes available (in MW range)


  • High minimum load requirement (20%–40%)
  • Limited dynamic operation (requires stable load)
  • Corrosive liquid electrolyte
  • Large footprint
  • Does not accommodate variability of power supply as well as other electrochemical methods
  • Crossover of gases leads to lower degree of purity, and reduced efficiency due to re-formation of water
  • Low current density

RD&D priorities

  • Improve operational flexibility
  • Enable higher temperature operation
  • Improve oxygen evolution
  • Achieve higher pressure operation

Known active organisations

  • Curtin University
  • Monash University
  • Queensland University of Technology
  • The University of Adelaide
  • The University of Melbourne
  • The University of New South Wales
  • The University of Western Australia

Other opportunities like this

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