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Title: Chemical and structural origin of lattice oxygen oxidation in Co–Zn oxyhydroxide oxygen evolution electrocatalysts
Authors: Huang, Zhenfeng
Song, Jiajia
Du, Yonghua
Xi, Shibo
Dou, Shuo
Nsanzimana, Jean Marie Vianney
Wang, Cheng
Xu, Jason Zhichuan
Wang, Xin
Keywords: Engineering::Chemical engineering
Issue Date: 2019
Source: Huang, Z., Song, J., Du, Y., Xi, S., Dou, S., Nsanzimana, J. M. V., Wang, C., Xu, J. Z. & Wang, X. (2019). Chemical and structural origin of lattice oxygen oxidation in Co–Zn oxyhydroxide oxygen evolution electrocatalysts. Nature Energy, 4(4), 329-338.
Project: M4020246
Journal: Nature Energy
Abstract: The oxygen evolution reaction (OER) is a key process in electrochemical energy conversion devices. Understanding the origins of the lattice oxygen oxidation mechanism is crucial because OER catalysts operating via this mechanism could bypass certain limitations associated with those operating by the conventional adsorbate evolution mechanism. Transition metal oxyhydroxides are often considered to be the real catalytic species in a variety of OER catalysts and their low-dimensional layered structures readily allow direct formation of the O–O bond. Here, we incorporate catalytically inactive Zn2+ into CoOOH and suggest that the OER mechanism is dependent on the amount of Zn2+ in the catalyst. The inclusion of the Zn2+ ions gives rise to oxygen non-bonding states with different local configurations that depend on the quantity of Zn2+. We propose that the OER proceeds via the lattice oxygen oxidation mechanism pathway on the metal oxyhydroxides only if two neighbouring oxidized oxygens can hybridize their oxygen holes without sacrificing metal–oxygen hybridization significantly, finding that Zn0.2Co0.8OOH has the optimum activity.
ISSN: 2058-7546
DOI: 10.1038/s41560-019-0355-9
Rights: © 2019 The Author(s), under exclusive licence to Springer Nature Limited. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:SCBE Journal Articles

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