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Confined synthesis of edge-rich V-doped MoSe2 nanosheets on carbon black for advanced hydrogen evolution reaction
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  • Xianpei Ren,
  • Fei Wu,
  • Yonghua Wang ,
  • Fei Li
Xianpei Ren
Sichuan University of Science and Engineering

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Fei Wu
Sichuan University of Science and Engineering
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Yonghua Wang
Sichuan University of Science and Engineering
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Fei Li
Chengdu University of Science and Technology
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Abstract

MoSe2 as one graphene-like 2D transition metal selenide has attracted great attention. However, its application for the hydrogen evolution reaction (HER) is still restricted by the poor electrical conductivity and structural restacking. In this work, an excellent electro-catalyst for hydrogen production is developed based on the in-situ synthesis of V-doped MoSe2 confined on carbon black nanoparticles (denoted as V-MoSe2/CB) via a sol-gel process. The characterization results show the carbon black nanoparticles can protect the V-MoSe2 nanosheets from agglomeration, resulting in ultra-thin thickness and short vertical lattice arrays. Meanwhile, Density func-tional theory (DFT) calculations indicate that vanadium doping can optimize the electronic structure of MoSe2. Accordingly, compared to pure MoSe2, V-MoSe2 and MoSe2/CB electrocatalyst, V-MoSe2/CB exhibits improved electrocatalytic activity with a small overpoten-tial of 166 mV at -10 mA cm-2 and a small Tafel slope of 65 mV dec-1. This work paves a new way for improving the HER performance through synergistic morphology, structure and electronic regulation.