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

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^-2_geo, 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.

SUBMITTER: Miao X

PROVIDER: S-EPMC6707249 | biostudies-literature | 2019 Aug

REPOSITORIES: biostudies-literature

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

Miao Xianbing X Zhang Lifu L Wu Liang L Hu Zhenpeng Z Shi Lei L Zhou Shiming S

Nature communications 20190823 1

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. Mo ...[more]

PMID: 31444337

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