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Research Article

The “mediated molecular”-assisted construction of Mo2N islands dispersed on Co-based nanosheets for high-efficient electrocatalytic hydrogen evolution reaction

Fanyi Kong, Aiping Wu, Siyu Wang, Xinhui Zhang, Chungui Tian( ), Honggang Fu( )
Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education of the People’s Republic of China, Heilongjiang University, Harbin 150080, China
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Graphical Abstract

We reported the construction of two-dimensional (2D) Co-Mo nitrides based heterojunctions for high-efficient hydrogen evolution reaction (HER) based on the use of a “mediated molecular”. The catalyst exhibits an onset potential of 0 mV and the overpotential of 10 mA·cm−2 at 35.0 mV, which is close to that of Pt/C catalyst. It also exhibits an activity superior to Pt/C at high current density (> 100 mA·cm−2).

Abstract

The rational design of the catalysts with easily-accessible surface and high intrinsic activity is desirable for electrocatalytic hydrogen evolution reaction (HER). Here, we reported the construction of two-dimensional (2D) Co-Mo nitrides based heterojunctional catalyst for efficient HER based on a “mediated molecular” assisted route. The 2D Co(OH)2 sheet reacted partially with the “mediated molecular” (2-methylimidazole (2-MIM)) to form zeolitic imidazolate framework (ZIF)-67 at surface, giving ZIF-67/Co(OH)2 sheets. The ZIF-67 combines with [PMo12O40]3− cluster (PMo12) due to the interaction of mediated molecular with PMo12, producing 2D Mo-Co-2MIM/Co(OH)2 bimetallic precursor. After controlled nitriding, the Mo2N islands dispersed on 2D porous Co-based sheets were formed. A series of characterizations and density functional theory (DFT) calculation indicated the formation of a close contact interface, which promotes the electron transfer between Mo and Co components, enhances the electron migration/redistribution and redistribution and down-shift of d-band center and thus gives a high intrinsic activity. The 2D characteristics make the catalyst more accessible contact sites, which is favourable to promot the HER. The tests showed that the optimized catalyst exhibits an onset potential of 0 mV and an overpotential of 10 mA·cm−2 at 35.0 mV, which is quite close to that of Pt/C catalyst. It also exhibits an activity superior to Pt/C at high current density (> 100 mA·cm−2). A good stability of the catalyst was achieved with no significant decay for 100 h of continuous operation. The electrolytic cell composed of optimized catalyst and P-NiFe-layered double hydroxide (LDH) can be driven by low voltage (only 1.47 V) to reach a current density of 10 mA·cm−2.

Keywords

two-dimensional heterojunctionsnitridespolyoxometalates (POMs)zeolitic imidazole framework-67 (ZIF-67)electrocatalytic hydrogen evolution reaction (HER)

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Nano Research
Volume 16 Issue 8,
August 2023
Pages 10857-10866
DOI: 10.1007/s12274-023-5878-5
Cite this article:
Kong F, Wu A, Wang S, et al. The “mediated molecular”-assisted construction of Mo2N islands dispersed on Co-based nanosheets for high-efficient electrocatalytic hydrogen evolution reaction. Nano Research, 2023, 16(8): 10857-10866. https://doi.org/10.1007/s12274-023-5878-5
Topics:
Hydrogen evolution reaction

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Received: 01 April 2023
Revised: 15 May 2023
Accepted: 29 May 2023
Published: 17 July 2023
© Tsinghua University Press 2023
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