Quadruple perovskite ruthenate as a highly efficient catalyst for acidic water oxidation

Miao, Zhang, Wu, Hu, Shi, Zhou (2019) Quadruple perovskite ruthenate as a highly efficient catalyst for acidic water oxidation Nat Commun (IF: 16.6) 10(1) 3809

Abstract

Development of highly active and durable oxygen-evolving catalysts in acid media is a major challenge to design proton exchange membrane water electrolysis for producing hydrogen. Here, we report a quadruple perovskite oxide CaCu3Ru4O12 as a superior catalyst for acidic water oxidation. This complex oxide exhibits an ultrasmall overpotential of 171 mV at 10 mA cm-2geo, which is much lower than that of the state-of-the-art RuO2. Moreover, compared to RuO2, CaCu3Ru4O12 shows a significant increase in mass activity by more than two orders of magnitude and much better stability. Density functional theory calculations reveal that the quadruple perovskite catalyst has a lower Ru 4d-band center relative to RuO2, which effectively optimizes the binding energy of oxygen intermediates and thereby enhances the catalytic activity.

Links

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6707249
http://www.ncbi.nlm.nih.gov/pubmed/31444337
http://dx.doi.org/10.1038/s41467-019-11789-3

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