Chemical and structural origin of lattice oxygen oxidation in Co–Zn oxyhydroxide oxygen evolution electrocatalysts

Zhen-Feng Huang, Jiajia Song, Yonghua Du, Shibo Xi, Shuo Dou, Jean Marie Vianney Nsanzimana, Cheng Wang, Zhichuan J. Xu () and Xin Wang ()
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Zhen-Feng Huang: Nanyang Technological University
Jiajia Song: Nanyang Technological University
Yonghua Du: A*STAR
Shibo Xi: A*STAR
Shuo Dou: Nanyang Technological University
Jean Marie Vianney Nsanzimana: Nanyang Technological University
Cheng Wang: Tianjin University of Technology
Zhichuan J. Xu: Nanyang Technological University
Xin Wang: Nanyang Technological University

Nature Energy, 2019, vol. 4, issue 4, 329-338

Abstract: 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.

Date: 2019
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DOI: 10.1038/s41560-019-0355-9

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