Supriya Ghosh (Editor)

Alkaline water electrolysis

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Style of membrane/diaphragm  NiO
Catalyst material on the anode  Ni/Co/Fe
Anode PTL material  Ti/Ni/zirconium
Bipolar/separator plate material  Stainless steel
Catalyst material on the cathode  Ni/C-Pt
Type of Electrolysis:  Alkaline Water Electrolysis

Alkaline water electrolysis has a long history in the chemical industry. It is a type of electrolyzer that is characterized by having two electrodes operating in a liquid alkaline electrolyte solution of potassium hydroxide or sodium hydroxide. These electrodes are separated by a diaphragm, separating the product gases and transporting the hydroxide ions from one electrode to the other. A recent comparison showed that state-of-the-art nickel based water electrolyzers with alkaline electrolytes lead to competitive or even better efficiencies than acidic polymer electrolyte membrane water electrolysis with platinum group metal based electrocatalysts.

Electrolysis requires minerals to be present in solution, tap, well, and ground water contain various minerals which are both alkaline and acidic. Water above a pH of 7.0 is considered alkaline, below 7.0 it is acidic. Electrolysis can occur only if the water is acid or alkaline, the requirement is that there are ions in the water to conduct electricity for the water electrolysis process to occur.

References

Alkaline water electrolysis Wikipedia


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