A cu7s4@mos2 heterogeneous nanoskeleton material and its application in catalytic water electrolysis for hydrogen production

Abstract

The invention discloses a Cu7S4@MoS2 heterogeneous nanometer framework material and application thereof in producing hydrogen by catalytically electrolysing water.By means of a method for conducting thermal decomposition on a precursor, Cu7S4 serves as a supporting framework, and a tiny annular Cu7S4@MoS2 heterogeneous nanometer framework structure which is extremely high in activity and stability is obtained through MoS2 etching, wherein the surface of the Cu7S4@MoS2 heterogeneous nanometer framework structure is rich in active edge loca; after the surface ligands of the Cu7S4@MoS2 heterogeneous nanometer framework structure are removed, the Cu7S4@MoS2 heterogeneous nanometer framework structure is mixed with C powder, and the mixture is coated on electrodes to be applied to the process of catalytically electrolysing the water to produce hydrogen.Serving as a non-noble metal catalyst, due to the fact that the Cu7S4@MoS2 heterogeneous nanometer framework material has good crystallinity and is rich in MoS2 active edge loca, deposition potential of hydrogen in water can be reduced, the Cu7S4@MoS2 heterogeneous nanometer framework material can replace platinum to serve as an effective electro-catalysis material for hydrogen evolution, when electric current density reaches 10 mA / cm<2> and 200 mA / cm<2>, the overpotentials are only 133 mV and 206 mV respectively, and the highest activity and stability are shown in reported MoS2 nanometer catalysts.Due to the fact that a solvothermal method can be subjected to reasonable extension, by means of the Cu7S4@MoS2 heterogeneous nanometer framework material and the application thereof in producing hydrogen by catalytically electrolysing the water, a new way is paved for massively developing other non-noble sulfide catalysts.

Description

technical field [0001] The invention belongs to the technical field of preparation of nanomaterials, in particular to a kind of Cu with extremely high catalytic hydrogen evolution activity 7 S 4 @MoS 2 The nano-heterostructure framework material can be applied to catalyze the electrolysis of water to produce hydrogen. Background technique [0002] The hydrogen evolution reaction, which is a fundamental step in water electrolysis, requires efficient and low-cost catalysts to achieve fast kinetics for practical applications. For a long time, Pt has been considered as the most active hydrogen evolution catalyst for water electrolysis, but its low content and high price limit its wide-scale application. Nanostructured MoS as a promising alternative to Pt as a hydrogen evolution catalyst 2 has been extensively studied. So far, many researchers have confirmed the layered MoS through a large number of experiments and calculations. 2 The catalytic activity of is located at its...

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Problems solved by technology

However, the poor crystallinity of amorphous S atom leads to its relatively high solubility in acid and poor electrochemical stability, which limits its practical applications.

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