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DOI | 10.1039/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 |
ISSN | 17545692 |
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
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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 |
推荐引用方式 GB/T 7714 | 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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