气候变化领域集成服务门户(CCPortal): Electrochemically accessing ultrathin Co (oxy)-hydroxide nanosheets and: Operando identifying their active phase for the oxygen evolution reaction

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DOI	10.1039/c8ee03208d
	Electrochemically accessing ultrathin Co (oxy)-hydroxide nanosheets and: Operando identifying their active phase for the oxygen evolution reaction
	Zhou J.; Wang Y.; Su X.; Gu S.; Liu R.; Huang Y.; Yan S.; Li J.; Zhang S.
发表日期	2019
ISSN	17545692
起始页码	739
结束页码	746
卷号	12 期号:2
英文摘要	Cobalt (oxy)-hydroxide (CoOOH) has recently been identified as a realistic active species under operando conditions for the electrocatalytic oxygen evolution reaction (OER), which plays a pivotal role in multiple energy conversion technologies. Therefore, searching for a high-yield method to fabricate advanced nanostructures and understanding their reactivity are challenging but urgent tasks. Here, rather than conventional liquid exfoliation, we report an electrochemical route for potentially large-scale production of ultrathin CoOOH nanosheets, which deliver exceptionally high OER activity. This "nearly-all-surface" material provides an excellent platform to study the surface chemistry for electrocatalytic activity. Combining operando X-ray spectroscopy and theoretical calculations demonstrated a potential-dependent deprotonation reaction, i.e., Co 3+ OOH is transformed into an active Co 3+/4+ OOH 1-x phase for water oxidation under the applied potential. Comprehensive analysis suggested that reducing the deprotonation energy is the key to enhance the OER activity, and oxidized oxygen ions might act as electrophilic centers for the OER. © 2019 The Royal Society of Chemistry.
英文关键词	Energy conversion; Nanosheets; Oxygen; Surface chemistry; X ray spectroscopy; Comprehensive analysis; Deprotonation reaction; Electrocatalytic activity; Electrochemical routes; Energy conversion technologies; Large scale productions; Oxygen evolution reaction; Theoretical calculations; Cobalt compounds; activation energy; cobalt; electrochemical method; electrochemistry; hydroxide; nanomaterial; operations technology; oxygenation; 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/189984
作者单位	Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, 201800, China; Shanghai Synchrotron Radiation Facility, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai, 201210, China; University of Chinese Academy of Sciences, Beijing, 100049, China
推荐引用方式 GB/T 7714	Zhou J.,Wang Y.,Su X.,et al. Electrochemically accessing ultrathin Co (oxy)-hydroxide nanosheets and: Operando identifying their active phase for the oxygen evolution reaction[J],2019,12(2).
APA	Zhou J..,Wang Y..,Su X..,Gu S..,Liu R..,...&Zhang S..(2019).Electrochemically accessing ultrathin Co (oxy)-hydroxide nanosheets and: Operando identifying their active phase for the oxygen evolution reaction.Energy & Environmental Science,12(2).
MLA	Zhou J.,et al."Electrochemically accessing ultrathin Co (oxy)-hydroxide nanosheets and: Operando identifying their active phase for the oxygen evolution reaction".Energy & Environmental Science 12.2(2019).