Issue 5, 2020

Highly active hydrogen evolution catalysis on oxygen-deficient double-perovskite oxide PrBaCo2O6−δ

Abstract

Efficient hydrogen evolution on water splitting is a crucial issue to achieve a sustainable society based on renewable energy. Highly active and cost-effective catalysts for oxygen/hydrogen evolution reactions (OERs/HERs) are desired to suppress the intrinsically significant overpotential of these reactions. Perovskite-related transition-metal oxides have been widely investigated as promising candidates for electrochemical catalysts, whereas their complex composition and structure inhibit the elucidation of essential factors for activating HER. Herein, we report a systematic study on predominant factors affecting HER catalysis for Co-containing perovskite-related oxides. The A-site-ordered double perovskite oxide PrBaCo2O6−δ exhibits HER activity with a volcano-type plot associated with oxygen deficiency content, and shows the highest activity at a moderate value of δ = 0.2, in addition to the significant superiority to the simple ABO3-type perovskite, ACoO3 (A = La, La0.5Ca0.5, Ca). Based on the Tafel slope, electric conductivity, and charge-transfer resistance analyses, we have found that complementary factors dominate the HER catalysis; Co–O covalency and water dissociation site, which are respectively induced by high Co valence and oxygen deficiency. This finding provides new insight into the rational design of transition-metal oxide catalysts for HER.

Graphical abstract: Highly active hydrogen evolution catalysis on oxygen-deficient double-perovskite oxide PrBaCo2O6−δ

Supplementary files

Article information

Article type
Research Article
Submitted
31 Jan 2020
Accepted
24 Mar 2020
First published
24 Mar 2020

Mater. Chem. Front., 2020,4, 1519-1529

Highly active hydrogen evolution catalysis on oxygen-deficient double-perovskite oxide PrBaCo2O6−δ

H. Togano, K. Asai, S. Oda, H. Ikeno, S. Kawaguchi, K. Oka, K. Wada, S. Yagi and I. Yamada, Mater. Chem. Front., 2020, 4, 1519 DOI: 10.1039/D0QM00056F

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