工程化高能界面结构用于高性能含氧电催化。
Engineering High-Energy Interfacial Structures for High-Performance Oxygen-Involving Electrocatalysis.
机构信息
School of Chemical Engineering, University of Adelaide, Adelaide, SA, 5005, Australia.
Department of Chemistry and Biochemistry, Kent State University, Kent, USA.
出版信息
Angew Chem Int Ed Engl. 2017 Jul 10;56(29):8539-8543. doi: 10.1002/anie.201701531. Epub 2017 Mar 24.
Engineering high-energy interfacial structures for high-performance electrocatalysis is achieved by chemical coupling of active CoO nanoclusters and high-index facet Mn O nano-octahedrons (hi-Mn O ). 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 -O present in hi-Mn O . The CoO/hi-Mn O 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.
通过将活性 CoO 纳米团簇和高指数晶面 MnO 纳米八面体（hi-MnO）进行化学偶联，实现了用于高性能电催化的高能界面结构工程。综合利用基于同步加速器的近边 X 射线吸收精细结构等多种技术进行的深入表征揭示，两种组分之间的强相互作用促进了高能界面 Mn-O-Co 物种和高氧化态 CoO 的形成，其中 hi-MnO 中的 Mn-O 从 CoO 中提取电子。CoO/hi-MnO 在传统金属氧化物基电催化剂上表现出优异的催化性能，其析氧反应（OER）活性比 Ru/C 高 1.2 倍，氧还原反应（ORR）活性与 Pt/C 相当，而且在碱性电解质中的稳定性也优于 Ru/C（95% vs. 81%保留的 OER 活性）和 Pt/C（92% vs. 78%保留的 ORR 活性，经过 10 小时运行后）。
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