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Research Article

Reduced water dissociation barrier on constructing Pt-Co/CoOx interface for alkaline hydrogen evolution

Yandong Wang1, Wei Wu1, Runzhe Chen1, Caoxin Lin1, Shichun Mu2, Niancai Cheng1( )
College of Materials Science and Engineering, Fuzhou University, Fuzhou 350108, China
State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China
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Graphical Abstract

The introduced dual active sites and strong electronic interaction in PtCo/CoOx interface providethe boosted water dissociation ability for catalysts, which results in the excellent alkalinehydrogen evolution reaction (HER) activity.

Abstract

Water dissociation process is generally regarded as the rate-limiting step for alkaline hydrogen evolution reaction (HER), and severely inhibits the catalytic efficiency of Pt based catalysts. To overcome this problem, the in-situ constructed interfaces of Pt-Co alloy and amorphous cobalt oxide (CoOx) on the carbon powder are designed. The amorphous CoOx at Pt-Co/CoOx interfaces not only provide active sites for water dissociation to facilitate Volmer step, but also produce the strong electronic transfer with Pt-Co. Accordingly, the obtained interfacial catalysts exhibit outstanding alkaline HER performance with a Tafel slope of 29.3 mV·dec−1 and an ultralow overpotential of only 28 mV at 10 mA·cm−2. Density functional theory (DFT) reveals that the electronic accumulation on the interfacial Co atom in Pt-Co/CoOx constructing the novel active site for water dissociation. Compared to the Pt-Co, all of the energy barriers for water adsorption, water dissociation and hydrogen adsorption/desorption are reduced in Pt-Co/CoOx interfaces, suggesting a boosted HER kinetics for alkaline HER.

Keywords

interfacial constructionamorphous cobalt oxidewater dissociationdual active siteelectronic regulation

Electronic Supplementary Material

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Nano Research
Volume 15 Issue 6,
June 2022
Pages 4958-4964
DOI: 10.1007/s12274-022-4128-6
Cite this article:
Wang Y, Wu W, Chen R, et al. Reduced water dissociation barrier on constructing Pt-Co/CoOx interface for alkaline hydrogen evolution. Nano Research, 2022, 15(6): 4958-4964. https://doi.org/10.1007/s12274-022-4128-6
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Received: 10 December 2021
Revised: 29 December 2021
Accepted: 30 December 2021
Published: 27 January 2022
© Tsinghua University Press 2022
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