NiMOF-derived MoSe2@NiSe2 heterostructure with hollow core-shell for efficient hydrogen evolution reaction

Abstract

Hydrogen production by electrochemical water splitting is one of the best ways to store renewable energy. Metal organic framework (MOF)-derived non-precious metal catalysts are an effective idea for large-scale commercialization and electrolysis of water for hydrogen production. Herein, we have synthesized Ni,Mo bimetallic selenide MoSe₂@NiSe₂ heterojunctions with hollow core-shell using a selenization reaction to combine MoSe₂ with NiMOF-derived NiSe₂. The spherical clusters of MoSe₂ prevents the agglomeration and sintering of NiSe₂ and shorten the electron transfer distance form MoSe₂ to NiSe₂. The electron flow between the transition metals Ni and Mo after the selenization reaction, which alters the electronic structure of NiMOF and MoSe₂. NiSe₂ derived from NiMOF provides more active center as well as better conductivity to accelerate the electron transfer rate. Thus facilitating the HER catalytic process. Electrochemical analysis confirmed that the activity of Hydrogen evolution reaction (HER) of MoSe₂@NiSe₂ was significantly increased in 0.5 M H₂SO₄, with an overpotential of 187 mV at 10 mA cm⁻² and a tafel slope of 71.43 mV dec⁻¹. This work provides a new route for the design and preparation of the NiMOF-based catalysts in HER.