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Chromium Oxide-Ruthenium Oxide Solid Solution Anode Implemented in a Solid Phosphate Electrolyzer at 240 °C and 28 Bar Overpressure

This work offers an overview of the synthesis and implementation of various chromium-ruthenium oxide materials for gas-phase solid-acid water electrolysis under hydrothermal conditions (240 °C, 28 bar of Ar and steam overpressure). The oxidic solid solutions show general stability over a broad chrom...

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Bibliographic Details
Published in:Journal of the Electrochemical Society 2024-01, Vol.171 (1), p.13505
Main Authors: Bannert, F., Christensen, E., Berg, R. W., Köhler, K., Bjerrum, N. J.
Format: Article
Language:English
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Summary:This work offers an overview of the synthesis and implementation of various chromium-ruthenium oxide materials for gas-phase solid-acid water electrolysis under hydrothermal conditions (240 °C, 28 bar of Ar and steam overpressure). The oxidic solid solutions show general stability over a broad chromium concentration range in the RuO 2 rutile structure during synthesis. Decomposition of the solid solutions is observed over a potential of around 2.1 V during electrolysis (including the Ohmic contribution of the setup and cell). Electrolysis performed below this decomposition potential shows promising results for replacing pure RuO 2 with a low ruthenium-containing anode. Special attention has been given to Cr 0.6 Ru 0.4 O 2 for being less expensive because of the lower ruthenium content and showing good stability and comparable performance to RuO 2 during continuous chronopotentiometry operation for 1 h at 75 mA cm −2 current densities.
ISSN:0013-4651
1945-7111
DOI:10.1149/1945-7111/ad2055