Journal
ACS NANO
Volume 14, Issue 12, Pages 17640-17651Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.0c08571
Keywords
oxygen evolution reaction; electronic structures; adsorption energies; high-entropy multimetal oxide catalysts; kinetic modeling
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Funding
- Singapore MOE AcRF Tier 2 [2017-T2-2069]
- Singapore MOE MOE Tier 1 [2017-T1-002-009, 2020-T1-001-031]
- National Research Foundation of Singapore (NRF) Investigatorship [NRF2016NRF-NRFI001-22]
- 111 project from Zhengzhou University [D18023]
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Highly active oxygen evolution reaction (OER) electrocatalysts are important to effectively transform renewable electricity to fuel and chemicals. In this work, we construct a series of multimetal oxide nanoplate OER electrocatalysts through successive cation exchange followed by electrochemical oxidation, whose electronic structure and diversified metal active sites can be engineered via the mutual synergy among multiple metal species. Among the examined multimetal oxide nanoplates, CoCeNiFeZnCuOx nanoplates exhibit the optimal adsorption energy of OER intermediates. Together with the high electrochemical active surface area, the CoCeNiFeZnCuOx nanoplates manage to deliver a small overpotential of 211 mV at an OER current density of 10 mA cm(-2) (eta(10)) with a Tafel slope as low as 21 mV dec(-1) in 1 M KOH solution, superior to commercial IrO2 (339 mV at eta(10), Tafel slope of 55 mV dec(-1)), which can be stably operated at 10 mA cm(-2) (at an overpotential of 211 mV) and 100 mA cm(-2) (at an overpotential of 307 mV) for 100 h.
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