Engineering High-Energy Interfacial Structures for High-Performance Oxygen-Involving Electrocatalysis
Engineering High-Energy Interfacial Structures for High-Performance Oxygen-Involving Electrocatalysis
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DOI：
10.1002/anie.201701531
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发表时间：
2017-07-10
影响因子：
16.6
通讯作者：
Qiao, Shi-Zhang
中科院分区：
文献类型：
--
作者：
Guo, Chunxian;Zheng, Yao;Qiao, Shi-Zhang
通过活性CoO纳米团簇和高折射率面Mn 3 O 4纳米八面体（hi-Mn 3 O 4）的化学耦合实现了用于高性能电催化的工程高能界面结构。一个彻底的表征，包括基于同步加速器的近边X射线吸收精细结构，揭示了这两个组件之间的强相互作用，促进形成高能量的界面Mn-O-Co物种和高氧化态的CoO，从其中的电子由MnIII-O中存在的高-Mn 3 O 4。CoO/hi-Mn 3 O 4表现出优于传统金属氧化物基电催化剂的优异催化性能，其表现为析氧反应（OER）活性是Ru/C的1.2倍，氧还原反应（ORR）活性与Pt/C相当，并且稳定性优于Ru/C（95%对81%保留的OER活性）和Pt/C（运行10小时后92%对78%保留的ORR活性）。
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.