Manganese oxides are promising as catalysts for this reaction. Recent reports show that their activity can be drastically enhanced when modified with gold. Herein, we investigate highly active mixed Au-MnOxthin films for the oxygen evolution reaction, which exhibit more than five times improvement over pure MnOx. These films are characterized with operando X-ray Absorption Spectroscopy, which reveal that Mn assumes a higher oxidation state under reaction conditions when Au is present. The magnitude of the enhancement is correlated to the size of the Au domains, where larger domains are the more beneficial.
Rasmus Frydendal, Linsey C. Seitz, Dimosthenis Sokaras, Tsu-Chien Weng, Dennis Nordlundc, Ib Chorkendorff, Ifan E.L. Stephens and Thomas F. Jaramillo
Electrochimica Acta
Volume 230, 10 March 2017, Pages 22–28
doi.org/10.1016/j.electacta.2017.01.085
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