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Constructing an Adaptive Heterojunction as a Highly Active Catalyst for the Oxygen Evolution Reaction

Journal Article · · Advanced Materials
 [1];  [2];  [1];  [3];  [3];  [4];  [1];  [5];  [5];  [4];  [4];  [6];  [3];  [1]
  1. Nanyang Technological Univ. (Singapore)
  2. Nanyang Technological Univ. (Singapore); The Cambridge Center for Advanced Research and Education in Singapore (Singapore)
  3. Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Physics. Beijing National Lab. for Condensed Matter Physics (BNLCP-CAS)
  4. Beihang University, Beijing (China)
  5. Institute of Chemical and Engineering Sciences (Singapore)
  6. The Cambridge Center for Advanced Research and Education in Singapore (Singapore); Univ. of Cambridge (United Kingdom)
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. Here, 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.
Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
National Natural Science Foundation of China (NSFC); Singapore Ministry of Education (MOE); Singapore National Research Foundation; USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0012704
OSTI ID:
1807940
Report Number(s):
BNL--221794-2021-JAAM
Journal Information:
Advanced Materials, Journal Name: Advanced Materials Journal Issue: 30 Vol. 32; ISSN 0935-9648
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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