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Title: Constructing an adaptive heterojunction as a highly active catalyst for the oxygen evolution reaction
Authors: Ren, Xiao
Wei, Chao
Sun, Yuanmiao
Liu, Xiaozhi
Meng, Fanqi
Meng, Xiaoxia
Sun, Shengnan
Xi, Shibo
Du, Yonghua
Bi, Zhuanfang
Shang, Guangyi
Fisher, Adrian C.
Gu, Lin
Xu, Jason Zhichuan
Keywords: Engineering::Materials
Issue Date: 2020
Source: Ren, X., Wei, C., Sun, Y., Liu, X., Meng, F., Meng, X., Sun, S., Xi, S., Du, Y., Bi, Z., Shang, G., Fisher, A. C., Gu, L. & Xu, J. Z. (2020). Constructing an adaptive heterojunction as a highly active catalyst for the oxygen evolution reaction. Advanced Materials, 32(30), 2001292-.
Project: MOE2018-T2-2-027
Journal: Advanced Materials
Abstract: Electrochemical water splitting is of prime importance to green energy technology. Particularly, the reaction at the anode side, namely the oxygen evolution reaction (OER), requires a high overpotential associated with OO bond formation, which dominates the energy-efficiency of the whole process. Activating the anionic redox chemistry of oxygen in metal oxides, which involves the formation of superoxo/peroxo-like (O2 )n - , commonly occurs in most highly active catalysts during the OER process. In this study, a highly active catalyst is designed: electrochemically delithiated LiNiO2 , which facilitates the formation of superoxo/peroxo-like (O2 )n - species, i.e., NiOO*, for enhancing OER activity. The OER-induced surface reconstruction builds an adaptive heterojunction, where NiOOH grows on delithiated LiNiO2 (delithiated-LiNiO2 /NiOOH). At this junction, the lithium vacancies within the delithiated LiNiO2 optimize the electronic structure of the surface NiOOH to form stable NiOO* species, which enables better OER activity. This finding provides new insight for designing highly active catalysts with stable superoxo-like/peroxo-like (O2 )n - for water oxidation.
ISSN: 0935-9648
DOI: 10.1002/adma.202001292
Schools: School of Materials Science and Engineering 
Organisations: The Cambridge Centre for Advanced Research and Education in Singapore
Research Centres: Energy Research Institute @ NTU (ERI@N) 
Solar Fuels Laboratory 
Rights: © 2020 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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