Journal
ADVANCED MATERIALS
Volume 32, Issue 30, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202001292
Keywords
adaptive junctions; cycling; delithiation; oxygen evolution; reconstruction
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Funding
- Singapore Ministry of Education Tier 2 Grant [MOE2018-T2-2-027]
- Singapore National Research Foundation under its Campus for Research Excellence and Technological Enterprise (CREATE) program
- National Natural Science Foundation of China (NSFC) [11804014]
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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 (O-2)(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 (O-2)(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 LiNiO(2)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 (O-2)(n)(-)for water oxidation.
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