Nickel based electrocatalysts for oxygen evolution in high current density, alkaline water electrolysers

Literature Information

Publication Date 2010-11-15
DOI 10.1039/C0CP00993H
Impact Factor 3.676
Authors

Xiaohong Li, Frank C. Walsh, Derek Pletcher


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Abstract

A number of nickel based materials are investigated as potential oxygen evolution catalysts under conditions close to those met in modern, high current density alkaline water electrolysers. Microelectrodes are used to avoid distortion of voltammetric data by IR drop even at the high current densities employed in such water electrolysers. High surface area nickel metal oxides prepared by cathodic deposition and mixed oxides prepared by thermal methods are considered. A mixed Ni/Fe oxide is the preferred electrocatalyst. The influence of hydroxide ion concentration and temperature on the voltammetry is defined. Preliminary stability tests in a zero gap cell with an OH− conducting membrane show no significant increase in overpotential during 10 days operation in 4 M NaOH electrolyte at a current density of 1 A cm−2 at 333 K.

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
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