Three-dimensional nitrogen-doped transition metal oxide/nickel sulfide composite catalyst and preparation method and application thereof

Abstract

The invention discloses a three-dimensional nitrogen-doped transition metal oxide/nickel sulfide composite catalyst. The catalyst includes nickel foam, nitrogen-doped transition metal oxide and nickelsulfide, wherein the nickel foam serves as a substrate, and the nitrogen-doped transition metal oxide grows on the nickel foam in situ. The invention further discloses a preparation method of the three-dimensional nitrogen-doped transition metal oxide/nickel sulfide composite catalyst. The method includes the following steps that the nickel foam substrate is impregnated in an ammonium tetrathiomolybdate solution and dried after impregnation, and an ammonium tetrathiomolybdate contained nickel foam precursor is obtained; the nickel foam precursor is subjected to vacuum high-temperature calcination, and the molybdenum dioxide/nickel sulfide composite catalyst is obtained; the molybdenum dioxide/nickel sulfide composite materials are subjected to thermal ammoniation, and the three-dimensional nitrogen-doped transition metal oxide/nickel sulfide composite catalyst is obtained. The invention further provides the application of the composite catalyst as a cathode catalyst material in an electrolytic water cathode HER reaction, the composite catalyst shows excellent electrocatalytic performance in alkaline electrolyte and has good stability, and the possibility of hydrogen energy development and utilization is further improved.

Description

technical field [0001] The invention belongs to the technical field of nanometer material technology and electrochemical energy conversion, in particular to a three-dimensional nitrogen-doped transition metal oxide / nickel sulfide composite catalyst, its preparation method and application. Background technique [0002] Hydrogen energy is widely considered to be an ideal substitute for traditional fossil fuels. At present, among various hydrogen evolution methods, electrochemical water splitting hydrogen production is one of the most promising methods and has been extensively and deeply studied. However, among the current active electrocatalysts for the hydrogen evolution reaction (HER), noble metal Pt-based catalysts are the best reported electrocatalysts, but their high cost and scarcity hinder the large-scale industrial application of Pt-based catalysts. In recent years, many research efforts have been devoted to the development of low-cost non-noble metal HER electrocataly...

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