Sulfur/nitrogen co-doped graphene and preparation method thereof

Abstract

The invention discloses sulfur/nitrogen co-doped graphene and a preparation method thereof. The preparation method comprises the following steps: firstly, preparing graphene oxide based on a Hummers method, secondly, adding anhydrous dimethyl sulfoxide, performing ultrasonic dispersion, adding phosphorus pentasulfide for stirring and reaction, then performing vacuum suction filtration, performingdrip washing through anhydrous tetrahydrofuran, heating obtained black powder in a tubular furnace, preserving the heat to treat the black powder under a certain gas atmosphere, and finally, naturallycooling the black powder to room temperature, thereby obtaining the sulfur/nitrogen co-doped graphene. The method is simple in step and low in cost. The sulfur/nitrogen co-doped graphene prepared through the preparation method disclosed by the invention is excellent in catalytic activity of electrocatalytic oxygen reduction reaction (ORR), and has an extreme current density of -4.7 mA cm<-2> andan electron transfer number of 3.9; the catalysis performance of the sulfur/nitrogen co-doped graphene is close to that of a commercial platinum/carbon catalyst. The sulfur/nitrogen co-doped graphenehas a great application potential in the field of green energy conversion.

Description

technical field [0001] The invention relates to the field of graphene material preparation, in particular to a sulfur / nitrogen co-doped graphene and a preparation method thereof. Background technique [0002] Graphene is a "star material" with a typical planar two-dimensional nano-carbon skeleton structure, which exhibits outstanding properties such as high specific surface area, high carrier mobility, and excellent mechanical properties, which has attracted scientists extensive exploration and research. In addition, the carbon skeleton structure of graphene also has excellent designability; various excellent properties can be obtained by functionalizing the carbon skeleton structure of graphene. Therefore, more in-depth research on graphene-based functional materials is of great significance for the development of new-generation materials and devices. [0003] At present, due to various problems caused by environmental pollution and the greenhouse effect, green energy con...

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Problems solved by technology

[0005] In view of the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is to develop a kind of sulfur / nitrogen co-doped graphene and its preparation method, to solve the shortcomings of complex preparation method, low doping content, low catalytic performance, etc. The invention prepares a dual-element doped graphene material with excellent catalytic performance by a mild, simple and low-cost method, which has excellent performance and is of great significance to the development of the field of green energy conversion

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