Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/148440
Title: Anodic oxidation enabled cation leaching for promoting surface reconstruction in water oxidation
Authors: Duan, Yan
Lee, Jun Yan
Xi, Shibo
Sun, Yuanmiao
Ge, Jingjie
Ong, Samuel Jun Hoong
Chen, Yubo
Dou, Shuo
Meng, Fanxu
Diao, Caozheng
Fisher, Adrian C.
Wang, Xin
Scherer, Günther G.
Grimaud, Alexis
Xu, Zhichuan J.
Keywords: Science::Chemistry::Physical chemistry::Electrochemistry
Engineering::Materials::Energy materials
Issue Date: 2021
Source: Duan, Y., Lee, J. Y., Xi, S., Sun, Y., Ge, J., Ong, S. J. H., Chen, Y., Dou, S., Meng, F., Diao, C., Fisher, A. C., Wang, X., Scherer, G. G., Grimaud, A. & Xu, Z. J. (2021). Anodic oxidation enabled cation leaching for promoting surface reconstruction in water oxidation. Angewandte Chemie International Edition, 60(13), 7418-7425. https://dx.doi.org/10.1002/anie.202015060
Journal: Angewandte Chemie International Edition
Abstract: A rational design on oxygen evolution reaction (OER) catalysts is pivotal to the overall efficiency of water electrolysis. Numerous works have been devoted to understanding the cation leaching and surface reconstruction of some very active electrocatalysts, while few have been on intentionally promoting the surface in a controlled fashion. In this work, we report controllable anodic leaching of Cr in CoCr2O4 by activating the pristine material at high potential, which enables the transformation of inactive spinel CoCr2O4 into a highly active catalyst. The depletion of Cr and consumption of lattice oxygen facilitate surface defects and oxygen vacancies, exposing Co species to reconstruct into active Co oxyhydroxides differ from CoOOH. A novel mechanism with the evolution of tetrahedrally coordinated surface cation into octahedral configuration via non-concerted proton-electron transfer is proposed. This work shows the importance of controlled anodic potential in modifying the surface chemistry of electrocatalysts.
URI: https://hdl.handle.net/10356/148440
ISSN: 1433-7851
DOI: 10.1002/anie.202015060
Rights: This is the peer reviewed version of the following article: Duan, Y., Lee, J. Y., Xi, S., Sun, Y., Ge, J., Ong, S. J. H., Chen, Y., Dou, S., Meng, F., Diao, C., Fisher, A. C., Wang, X., Scherer, G. G., Grimaud, A. & Xu, Z. J. (2021). Anodic oxidation enabled cation leaching for promoting surface reconstruction in water oxidation. Angewandte Chemie International Edition, 60(13), 7418-7425. https://dx.doi.org/10.1002/anie.202015060, which has been published in final form at https://doi.org/10.1002/anie.202015060. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.
Fulltext Permission: embargo_20220322
Fulltext Availability: With Fulltext
Appears in Collections:MSE Journal Articles

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  Until 2022-03-22
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