Engineering high-energy interfacial structures for high performance oxygen-involving electrocatalysis
Date
2017
Authors
Guo, C.
Zheng, Y.
Ran, J.
Xie, F.
Jaroniec, M.
Qiao, S.-Z.
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Journal article
Citation
Angewandte Chemie International Edition, 2017; 59(29):8539-8543
Statement of Responsibility
Chunxian Guo, Yao Zheng, Jingrun Ran, Fangxi Xie, Mietek Jaroniec, and Shi-Zhang Qiao
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Abstract
Engineering high-energy interfacial structures for high-performance electrocatalysis is achieved by chemical coupling of active CoO nanoclusters and high-index facet Mn₃O₄ nano-octahedrons (hi-Mn₃O₄). A thorough characterization, including synchrotron-based near edge X-ray absorption fine structure, reveals that strong interactions between both components promote the formation of high-energy interfacial Mn-O-Co species and high oxidation state CoO, from which electrons are drawn by MnIII-O present in hi-Mn₃O₄. The CoO/ hi-Mn₃O₄ demonstrates an excellent catalytic performance over the conventional metal oxide-based electrocatalysts, which is reflected by 1.2 times higher oxygen evolution reaction (OER) activity than that of Ru/C and a comparable oxygen reduction reaction (ORR) activity to that of Pt/C as well as a better stability than that of Ru/C (95% vs. 81% retained OER activity) and Pt/C (92% vs. 78% retained ORR activity after 10 h running) in alkaline electrolyte.
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© 2017 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim