Enhancing Activity for the Oxygen Evolution Reaction: The Beneficial Interaction of Gold with Manganese and Cobalt Oxides

Rasmus Frydendal, Michael Busch, Niels Bendtsen Halck, Elisa Antares Paoli, Petr Krtil, Ib Chorkendorff, Jan Rossmeisl

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Electrochemical production of hydrogen, facilitated in electrolyzers, holds great promise for energy storage and solar fuel production. A bottleneck in the process is the catalysis of the oxygen evolution reaction, involving the transfer of four electrons. The challenge is that the binding energies of all reaction intermediates cannot be optimized individually. However, experimental investigations have shown that drastic improvements can be realized for manganese and cobalt-based oxides if gold is added to the surface or used as substrate. We propose an explanation for these enhancements based on a hydrogen acceptor concept. This concept comprises a stabilization of an *-OOH intermediate, which effectively lowers the potential needed for breaking bonds to the surface. On this basis, we investigate the interactions between the oxides and gold by using DFT calculations. The results suggest that the oxygen evolution reaction overpotential decreases by 100–300 mV for manganese oxides and 100 mV for cobalt oxides.
Original languageEnglish
JournalChemCatChem
Volume7
Issue number1
Pages (from-to)149-157
ISSN1867-3880
DOIs
Publication statusPublished - 2014

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