Preparation method and application of a graphene-supported cobalt disulfide oxygen reduction catalyst

Abstract

The invention relates to a preparation method of a graphene-supported cobalt disulphide oxygen reduction catalyst. The preparation method comprises the following specific preparation steps: (1) reacting, namely, dissolving cobalt sulphate and sodium thiosulphate into deionized water, adding sulphur powder into a mixed solution, and then performing mixed reaction on the mixed solution and a graphene oxide dispersing liquid; (2) separating, namely, cooling after the reaction is completed, performing centrifugal washing and drying on obtained solid precipitate, and finally obtaining the graphene-supported cobalt disulphide oxygen reduction catalyst. According to the preparation method, the graphene-supported cobalt disulphide oxygen reduction catalyst is prepared through a one-step hydrothermal method; a preparation process is simple and safe; reaction conditions are mild and controllable, low in cost and short in period. The invention also discloses application of the catalyst to an oxygen reduction reaction, and the catalyst shows high current density and good oxygen reduction kinetics. According to the preparation method of the graphene-supported cobalt disulphide oxygen reductioncatalyst, a platinum-based catalyst with high cost and scarce resources is replaced by a transition metal sulphide, so that the cost of a fuel battery is reduced to a great extent.

Description

technical field [0001] The invention belongs to the technical field of fuel cell electrocatalysis, and in particular relates to a preparation method and application of a graphene-supported cobalt disulfide oxygen reduction catalyst. Background technique [0002] Traditional fuel vehicles are one of the main sources of environmental pollution, and controlling the energy consumption and emissions of fuel vehicles is an important means to solve environmental problems. In recent years, with the increasingly prominent environmental and energy issues, new energy vehicles are gradually replacing the use of traditional fuel vehicles due to their clean and pollution-free features, and have become a research hotspot for major automobile manufacturers and scientific research institutions in the world. Fuel cell vehicles can truly achieve zero emissions and are considered to be the ultimate solution for new energy vehicles. There are still many difficulties in the large-scale commercia...

AI Technical Summary

Problems solved by technology

Cobalt disulfide materials are being used as electrode materials for lithium batteries and sodium batteries due to their good conductivity and thermal stability. There are still few studies on the application of cobalt disulfide to oxygen reduction reactions.

However, the control process of the existing preparation technology is complicated, and it needs to be carried out at a relatively high temperature, and the reaction conditions are harsh.

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