Engineering High‐Energy Interfacial Structures for High‐Performance Oxygen‐Involving Electrocatalysis. Issue 29 (24th March 2017)

• Record Type: Journal Article
• Authors: Guo, Chunxian; Zheng, Yao; Ran, Jingrun; Xie, Fangxi; Jaroniec, Mietek; Qiao, Shi‐Zhang
• Is Part Of: Angewandte Chemie international edition. Volume 56:Issue 29(2017)
• Page Start: 8539
• Page End: 8543
• Publication Date: 2017-03-24
• Subjects: electrocatalysts -- electrode materials -- high-energy interfaces -- nanocatalysis -- oxygen evolution; Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.201701531
• Languages: English
• ISSNs: 1433-7851

Abstract

Abstract: Engineering high‐energy interfacial structures for high‐performance electrocatalysis is achieved by chemical coupling of active CoO nanoclusters and high‐index facet Mn3 O4 nano‐octahedrons (hi‐Mn3 O4 ). 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‐Mn3 O4 . The CoO/hi‐Mn3 O4 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. Abstract : Nanocatalysis : Engineering high‐energy interfacial structures is achieved by chemical coupling of active CoO nanoclusters with high‐index facet Mn3 O4 nano‐octahedrons. The structures display synergistic effects enhancing their electrocatalytic performance and stability as compared to conventional electrocatalysts for bifunctional oxygen‐involving reactions.