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Engineering High‐Energy Interfacial Structures for High‐Performance Oxygen‐Involving Electrocatalysis
Author(s) -
Guo Chunxian,
Zheng Yao,
Ran Jingrun,
Xie Fangxi,
Jaroniec Mietek,
Qiao ShiZhang
Publication year - 2017
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201701531
Subject(s) - electrocatalyst , oxygen evolution , catalysis , nanoclusters , chemistry , electrolyte , oxygen , oxide , materials science , chemical engineering , inorganic chemistry , nanotechnology , electrode , electrochemistry , biochemistry , organic chemistry , engineering
Engineering high‐energy interfacial structures for high‐performance electrocatalysis is achieved by chemical coupling of active CoO nanoclusters and high‐index facet Mn 3 O 4 nano‐octahedrons (hi‐Mn 3 O 4 ). 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 Mn III ‐O present in hi‐Mn 3 O 4 . The CoO/hi‐Mn 3 O 4 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.