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

Xianbing Miao, Lifu Zhang, Liang Wu, Zhenpeng Hu (), Lei Shi and Shiming Zhou ()
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Xianbing Miao: University of Science and Technology of China
Lifu Zhang: Nankai University
Liang Wu: University of Science and Technology of China
Zhenpeng Hu: Nankai University
Lei Shi: University of Science and Technology of China
Shiming Zhou: University of Science and Technology of China

Nature Communications, 2019, vol. 10, issue 1, 1-7

Abstract: 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.

Date: 2019
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DOI: 10.1038/s41467-019-11789-3

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