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Quadruple Perovskite Ruthenate As a Highly Efficient Catalyst for Acidic Water Oxidation

Overview
Journal Nat Commun
Specialty Biology
Date 2019 Aug 25
PMID 31444337
Citations 17
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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 CaCuRuO as a superior catalyst for acidic water oxidation. This complex oxide exhibits an ultrasmall overpotential of 171 mV at 10 mA cm, which is much lower than that of the state-of-the-art RuO. Moreover, compared to RuO, CaCuRuO 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 RuO, which effectively optimizes the binding energy of oxygen intermediates and thereby enhances the catalytic activity.

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