Unveiling the active sites of ultrathin Co-Fe layered double hydroxides for the oxygen evolution reaction

doi:10.1016/s1872-2067(21)64033-0

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	Unveiling the active sites of ultrathin Co-Fe layered double hydroxides for the oxygen evolution reaction
	X. Bai; Z. Y. Duan; B. Nan; L. M. Wang; T. M. Tang and J. Q. Guan
	2022
发表期刊	Chinese Journal of Catalysis
ISSN	0253-9837
卷号	43 期号:8 页码:2240-2248
摘要	Two-dimensional layered double hydroxides (LDHs) have been identified as promising electrocatalysts for the oxygen evolution reaction (OER); however, the simple and effective synthesis of high-quality LDHs remains extremely challenging and the active sites have not been clarified. Herein, we report a facile solution-reaction method for preparing an ultrathin (thickness < 2 nm) non precious CoFe-based LDH. Co1Fe0.2 LDH delivers a current density of 10 mA cm(-2) and a high turnover frequency of 0.082 s(-1) per total 3d metal atoms at a low overpotential of 256 mV. Its mass activity is 277.9 A g(-1) at an overpotential of 300 mV for the OER. Kinetic studies reveal the Co site as the main active center for the OER. The doped Fe lowers the reaction barrier by accelerating the charge-transfer process. Theoretical calculations reveal that the surface Co sites adjacent to Fe atoms are the active centers for the OER and the subsurface Fe dopants excessively weaken the OH* adsorption, thus increasing the energy barrier of the rate-determining step. This study can guide the rational design of high-performance CoFe-based LDHs for water splitting. (C) 2022, Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. All rights reserved.
DOI	10.1016/s1872-2067(21)64033-0
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收录类别	sci
语种	英语
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文献类型	期刊论文
条目标识符	http://ir.ciomp.ac.cn/handle/181722/67220
专题	中国科学院长春光学精密机械与物理研究所
推荐引用方式 GB/T 7714	X. Bai,Z. Y. Duan,B. Nan,et al. Unveiling the active sites of ultrathin Co-Fe layered double hydroxides for the oxygen evolution reaction[J]. Chinese Journal of Catalysis,2022,43(8):2240-2248.
APA	X. Bai,Z. Y. Duan,B. Nan,L. M. Wang,&T. M. Tang and J. Q. Guan.(2022).Unveiling the active sites of ultrathin Co-Fe layered double hydroxides for the oxygen evolution reaction.Chinese Journal of Catalysis,43(8),2240-2248.
MLA	X. Bai,et al."Unveiling the active sites of ultrathin Co-Fe layered double hydroxides for the oxygen evolution reaction".Chinese Journal of Catalysis 43.8(2022):2240-2248.

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