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DOI10.1039/c8ee00773j
Operando X-ray spectroscopic tracking of self-reconstruction for anchored nanoparticles as high-performance electrocatalysts towards oxygen evolution
Song S.; Zhou J.; Su X.; Wang Y.; Li J.; Zhang L.; Xiao G.; Guan C.; Liu R.; Chen S.; Lin H.-J.; Zhang S.; Wang J.-Q.
发表日期2018
ISSN17545692
起始页码2945
结束页码2953
卷号11期号:10
英文摘要Exploring high-performance electrocatalysts for the oxygen evolution reaction (OER) is pivotal for renewable energy storage and conversion. The surface self-reconstruction during the OER is considered as the key of highly active catalysts, whereas identifying the local electronic and geometric structure of the reconstruction-derived components is challenging. Herein, an in situ exsolution method towards the typical LaCo0.8Fe0.2O3-δ perovskite is developed to obtain a new type of lanthana-anchored CoFe catalyst. The optimized catalyst exhibits a low overpotential of 293 mV to reach the current density of 10 mA cm-2 in 0.1 M KOH. Most importantly, operando X-ray absorption spectroscopy (XAS) measurements demonstrate that the CoFe species in the catalyst are nearly transformed into unique (Co/Fe)O(OH) with a definite coordination-unsaturated structure under electrochemical conditions, which actually contributes to this superior performance. Moreover, the presence of the lanthana support promotes this transformation. Our work not only suggests a facile reconstructive strategy to dramatically enhance the OER activity of perovskite oxides in alkaline media, but also unravels the fine structure of true active sites through operando X-ray spectroscopic tracking. © 2018 The Royal Society of Chemistry.
英文关键词Binary alloys; Electrocatalysts; Lanthanum oxides; Oxygen; Perovskite; Potassium hydroxide; X ray absorption spectroscopy; Electrochemical conditions; Electronic and Geometric Structures; Oxygen evolution; Oxygen evolution reaction; Perovskite oxides; Renewable energy storages; Self reconstruction; Unsaturated structures; Surface reconstruction; catalyst; chemical reaction; electrical method; energy storage; nanoparticle; oxygen; performance assessment; tracking; X-ray spectroscopy
语种英语
来源期刊Energy & Environmental Science
文献类型期刊论文
条目标识符http://gcip.llas.ac.cn/handle/2XKMVOVA/190097
作者单位Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, 201204, China; University of Chinese Academy of Sciences, Beijing, 100049, China; National Synchrotron Radiation Research Center, Hsinchu, 30076, Taiwan
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Song S.,Zhou J.,Su X.,et al. Operando X-ray spectroscopic tracking of self-reconstruction for anchored nanoparticles as high-performance electrocatalysts towards oxygen evolution[J],2018,11(10).
APA Song S..,Zhou J..,Su X..,Wang Y..,Li J..,...&Wang J.-Q..(2018).Operando X-ray spectroscopic tracking of self-reconstruction for anchored nanoparticles as high-performance electrocatalysts towards oxygen evolution.Energy & Environmental Science,11(10).
MLA Song S.,et al."Operando X-ray spectroscopic tracking of self-reconstruction for anchored nanoparticles as high-performance electrocatalysts towards oxygen evolution".Energy & Environmental Science 11.10(2018).
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