Preparation of sulfur and nitrogen co-doped three-dimensional graphene/manganese sulfide composite material and application of composite material in electrocatalytic reduction of oxygen

Abstract

The invention relates to preparation of a sulfur and nitrogen co-doped three-dimensional graphene / manganese sulfide (MnS / S,N-3DG) composite material and an application of the composite material in electrocatalytic reduction of oxygen. The preparation includes the following steps: preparing a MnS / S,N-3DG composite material, modifying a glassy carbon electrode surface with the MnS / S,N-3DG composite material, and testing the reduction electrocatalytic activity of the material on oxygen. The preparation has the beneficial effects that the sample and feasible way is adopted for preparation of the MnS / S,N-3DG composite material. Along with the introduction of nitrogen atoms, sulfur atoms and manganese sulfide, the composite material shows excellent oxygen reduction electrocatalytic activity. The stability and methanol resistance of the material are better than those of a commercial Pt / C catalyst.

Description

technical field [0001] The invention relates to the preparation of a sulfur and nitrogen co-doped three-dimensional graphene / manganese sulfide (MnS / S, N-3DG) composite material and its application to the electrocatalytic reduction of oxygen. It belongs to the field of material synthesis and electrocatalysis. technical background [0002] In energy conversion devices such as fuel cells, the oxygen reduction reaction (ORR) is a very important reaction. As we all know, platinum-based materials have the most prominent catalytic activity among many oxygen reduction catalysts, but the disadvantages of platinum catalysts, such as high price, scarce reserves and poor stability, are the main factors restricting its development. In order to improve the utilization of platinum catalysts or find other catalysts with high oxygen reduction activity, scientists have done a lot of research. [0003] Recently, a large number of studies have used heteroatom-doped carbon materials to replace...

AI Technical Summary

Problems solved by technology

[0004] Although the oxygen reduction activity of carbon materials can be greatly improved due to the co-doping of nitrogen atoms and sulfur atoms, the oxygen reduction activity of carbon materials is still inferior to that of platinum catalysts, and carbon materials are not suitable for O 2 The electrocatalytic reduction reaction is usually a two-electron transfer process, which greatly reduces the efficiency of the oxygen reduction reaction.

In addition, hydrogen peroxide will be generated during the two-electron transfer process, and hydrogen peroxide will reduce the stability of the oxygen reduction catalyst.

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