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Published September 2020 | Supplemental Material
Journal Article Open

Photochemically deposited Ir-doped NiCo oxyhydroxide nanosheets provide highly efficient stable electrocatalysts for the oxygen evolution reaction

Abstract

To achieve practical production of fuel from water, it is essential to develop efficient and durable electrocatalysts for the oxygen evolution reaction (OER). We report here that doping NiCoOOH nanosheets with 8% Ir leads to a low overpotential of only 260 mV for 50 mA/cm², far better than previous OER catalysts. We synthesized this catalyst using a novel photochemical deposition method that leads to a uniform distribution of dopant, large catalytic active area, high interfacial charge transfer efficiency, good adhesion between catalyst and matrix, and long lifetime. Moreover, these nanosheets show significant stable performance for 70 h in alkaline media. Our density functional theory calculations show that Ir and Co both play essential bifunctional roles in stabilizing the key O radical intermediate on Ir and promoting the O–O bond coupling on Co, which are optimum for the 8% Ir.

Additional Information

© 2020 Published by Elsevier Ltd. Received 16 February 2020, Revised 25 March 2020, Accepted 23 April 2020, Available online 16 May 2020. The Zhejiang University part of this research was supported by the National Natural Science Foundation of China (No. 21373182) and the Zhejiang Provincial Natural Science Foundation of China (LY17B030004). The research in Korea was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (No. 2020R1C1C1008458). The Caltech portion of the work was supported by the the US National Science Founation (CBET-1805022, Bob McCabe program manager). The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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August 22, 2023
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