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Nano Research 2022, 15(6): 4958-4964 https://doi.org/10.1007/s12274-022-4128-6
Research Article | Issue | Published: 27 January 2022

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

Show Author's Information 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
Keywords:
water dissociation, interfacial construction, amorphous cobalt oxide, dual active site, electronic regulation
Topics:
Catalytic
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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Abstract Full text Electronic supplementary material About this article

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.


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Electronic supplementary material
About this article

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

Show Author's information 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

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: water dissociation, interfacial construction, amorphous cobalt oxide, dual active site, electronic regulation

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Publication history
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Acknowledgements

Publication history

Received: 10 December 2021
Revised: 29 December 2021
Accepted: 30 December 2021
Published: 27 January 2022
Issue date: June 2022

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© Tsinghua University Press 2022

Acknowledgements

Acknowledgements

This work was supported by the National Natural Science Foundation of China (No. 21875039), the Project on the Integration of Industry-Education-Research of Fujian Province (No. 2021H6020), and Fujian province’s high level innovative and entrepreneurial talents (No. 50012709).

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