Abstract
NiSx-coated nickel cathodes are used for commercial water electrolysis in concentrated KOH solutions. Such electrodes have initially a high electrocatalytic performance. However, during operation the overpotential increases, which is also recognized by an increase of the cathodic Tafel slope. The sulphur content in the coating decreases rapidly from 25 mol% to 5 mol% during 16 days of electrolysis and to about 0.7 mol% after seven years of industrial operation. X-ray diffraction measurements indicate that the predominant sulphur containing compound is NiS1.00–1.03. The diameter of the particles in the coating decreases from about 50–60 µm to about 10 µm during seven years of operation.
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© 1998 Springer Science+Business Media Dordrecht
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Børresen, B., Bjørgum, A., Hagen, G., Tunold, R., Andreassen, K. (1998). Hydrogen Evolution at Activated Nisx-Cathodes in Water Electrolysis. In: Saetre, T.O. (eds) Hydrogen Power: Theoretical and Engineering Solutions. Springer, Dordrecht. https://doi.org/10.1007/978-94-015-9054-9_17
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DOI: https://doi.org/10.1007/978-94-015-9054-9_17
Publisher Name: Springer, Dordrecht
Print ISBN: 978-90-481-5029-8
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