Proceedings of Online nanoGe Fall Meeting 20 (OnlineNFM20)
Publication date: 4th October 2020
Currently, water electrolysers (WE) based on acidic electrolytes, viz. proton-exchange membranes (PEM), are becoming a preferred technology for the electrolytic generation of green hydrogen fuel. One key limitation of PEM-WE is the low stability of anode catalysts, which are nowadays exclusively based on one of the rarest and most expensive metals – iridium. The less expensive transition metal oxide catalysts are most commonly less active and even more unstable. The instability problem can be overcome via integration of the catalytically active component, transition metal oxide, into a highly-conductive matrix that is thermodynamically stable under the conditions of the operating PEM-WE anode, i.e. at low pH and high temperature. The present report demonstrates the effectiveness of this approach with the antimony oxide matrix that is used to stabilise non-noble third row transition metal catalysts and ruthenium. Significantly improved stability as compared to that reported in the literature is demonstrated, in particular on a week timescale at industrially relevant temperature of 80oC at pH 0.3. Factors affecting the activity and stability as well as possible strategies for further improvements will be also presented and discussed.
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