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Plasma-sprayed nickel cathode coatings for hydrogen evolution in alkaline electrolytes

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Abstract

Hydrogen evolution cathodes with plasma-sprayed nickel coatings were much more efficient in alkaline electrolytes than either uncoated cathodes or cathodes with porous sintered nickel coatings. This efficiency improvement could not be attributed to either superior coating morphology or increased surface area. The degree of coating oxidation appeared to be the main factor influencing the hydrogen evolution overpotentials at either the plasma-sprayed or sintered nickel cathode coatings studied. Highly-oxidized nickel surfaces produced much lower Tafel slopes than similar unoxidized surfaces. Plasma-sprayed nickel cathode coatings made with fine, high surface area nickel powder produced hydrogen evolution overpotentials in the range 0.10–0.14 V.

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  1. Inco Alloy Products Company Research Center, Inco-Sterling Forest, 10901, Suffern, New York, USA

    D. E. Hall

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  1. D. E. Hall
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Hall, D.E. Plasma-sprayed nickel cathode coatings for hydrogen evolution in alkaline electrolytes. J Appl Electrochem 14, 107–115 (1984). https://doi.org/10.1007/BF00611266

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  • DOI: https://doi.org/10.1007/BF00611266

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