Cobalt diselenide/graphite carbon composite material, namely oxygen reduction catalyst, and preparation method thereof

Abstract

The invention belongs to the technical field of chemical catalysts, and particularly relates to a cobalt diselenide / graphite carbon composite material, namely an oxygen reduction catalyst, and a preparation method thereof. The oxygen reduction catalyst provided by the invention is the cobalt diselenide / graphite carbon composite material and obtained by uniformly embedding cobalt diselenide nano-particles, the diameter of which is several nanometres, in a porous graphite carbon polyhedron. According to the invention, a synthesis method is simple; the production cost is low; large-scale preparation can be realized; compared with cobalt diselenide and a carbon materialwhich are subjected tomechanical mixing, the prepared composite material has the advantages of being high in interface coupling, uniform in cobalt diselenide particle distribution and the like; a carbon substrate has a mesoporous structure; and the oxygen reduction catalytic performance of the oxygen reduction catalyst in an alkaline environment is superior to that of the commercial platinum-carbon catalyst.

Description

technical field [0001] The invention belongs to the technical field of chemical catalysts, in particular to a cobalt diselenide / graphite carbon composite oxygen reduction catalyst and a preparation method thereof. Background technique [0002] With the development of social economy, a series of problems such as energy crisis and environmental pollution have become increasingly prominent. Fuel cells are considered to be the most promising chemical power sources for automobile power and other vehicles due to their high energy conversion efficiency, high energy, high power density, and zero emissions. However, the oxygen reduction reaction on the cathode of the fuel cell has a slow kinetic speed because it involves a multi-electron transfer process, which has become a bottleneck restricting the performance of the fuel cell. At present, the precious metal platinum / carbon is often used as a catalyst to improve the efficiency of cathode oxygen reduction, but the scarcity and high...

AI Technical Summary

Problems solved by technology

[0003] Most of the existing cobalt diselenide nanomaterials are prepared by solvothermal synthesis, which requires surfactants, and the reaction takes a long time and the reaction route is relatively complicated.

Images