New Low to Medium Temperature Electrolyte Separation Method and System for Alkaline Water Electrolysis
A new electrolysis method of maintaining product gas separation by using fluid flow perpendicularly through porous electrodes rather than using a gas impermeable membrane has been developed. This eliminates the need for any type of membrane. Eliminating the need for a membrane in alkaline electrolysis allows the device to operate at temperatures above 120°C, where most ion conducting membranes would degrade and fail. Operating at higher temperatures reduces the anode and cathode overpotentials substantially. The reduction in overpotentials allows non-platinum group metals to be used, while increasing the electrical efficiency at comparable current densities.
J. L. Hartvigsen et al., "New Low to Medium Temperature Electrolyte Separation Method and System for Alkaline Water Electrolysis," ECS Transactions, vol. 68, no. 3, pp. 133 - 137, The Electrochemical Society (ECS), Jul 2015.
The definitive version is available at https://doi.org/10.1149/06803.0133ecst
14th International Symposium on Solid Oxide Fuel Cells, SOFC 2015, held as part of the Electrochemical Society, ECS Conference on Electrochemical Energy Conversion and Storage (2015: Jul. 26-31, Glasgow, UK)
Chemical and Biochemical Engineering
Materials Science and Engineering
Keywords and Phrases
Electrodes; Electrolysis; Electrolytes; Energy conversion; Flow of fluids; Fuel storage; Hydrogen; Solid oxide fuel cells (SOFC); Temperature; Alkaline electrolysis; Alkaline water electrolysis; Electrical efficiency; Ion-conducting membranes; Medium temperature; Over potential; Porous electrodes; Separation methods; Gas permeable membranes
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31 Jul 2015