High-Performance Pyrochlore-Type Yttrium Ruthenate Electrocatalyst for Oxygen Evolution Reaction in Acidic Media

被引：425

作者：

Kim, Jaemin ^{[1
]}

Shih, Pei-Chieh ^{[1
]}

Tsao, Kai-Chieh ^{[1
]}

Pan, Yung-Tin ^{[1
]}

Yin, Xi ^{[1
]}

Sun, Cheng-Jun ^{[2
]}

Yang, Hong ^{[1
]}

机构：

[1] Univ Illinois, Dept Chem & Biomol Engn, 600 South Mathews Ave, Urbana, IL 61801 USA

[2] Argonne Natl Lab, Xray Sci Div, 9700 South Cass Ave, Argonne, IL 60439 USA

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2017年 / 139卷 / 34期

关键词：

WATER-OXIDATION; BIFUNCTIONAL ELECTROCATALYST; FUEL-CELL; CATALYSTS; EFFICIENT; ELECTROLYSIS; ARCHITECTURE; TRANSITION; REDUCTION; MECHANISM;

D O I：

10.1021/jacs.7b06808

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Development of acid-stable electrocatalysts with low overpotential for oxygen evolution reaction (OER) is a major challenge to produce hydrogen directly from water. We report in this paper a pyrochlore yttrium ruthenate (Y2Ru2O7-delta) electrocatalyst that has significantly enhanced performance toward OER in acid media over the best-known catalysts, with an onset overpotential of 190 mV and high stability in 0.1 M perchloric acid solution. X-ray absorption near-edge structure (XANES) indicates Y2Ru2O7-delta electrocatalyst had a low valence state that favors the high OER activity. Density functional theory (DFT) calculation shows this pyrochlore has lower band center energy for the overlap between Ru 4d and O 2p orbitals and is therefore more stable Ru-O bond than RuO2, highlighting the effect of yttrium on the enhancement in stability. The Y2Ru2O7-delta pyrochlore is also free of expensive iridium metal and thus is a cost-effective candidate for practical applications.

引用

页码：12076 / 12083

页数：8

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