Preparation method of highly dispersed NiCo alloy-graphene nanometer composite catalyst

Abstract

The invention belongs to the field of electrochemistry, and relates to a preparation method of a highly dispersed NiCo alloy-graphene nanometer composite catalyst. The preparation method comprises following steps: functionalized nanometer graphene is prepared; oxidized graphene is dispersed in deionized water, the above functionalized nanometer graphene is added with stirring, the pH value is adjusted to 7, a nickel source compound solution and a cobalt source compound solution are added drop by drop, an obtained precipitate is collected, and is washed with deionized water, and dried so as toobtain a nickel cobalt-oxidized graphene compound; calcination is carried out at a gas atmosphere so as to obtain the NiCo alloy-graphene nanometer composite catalyst. According to the preparation method, synthesis process is simplified; small size NiCo alloy nanometer particles are uniformly dispersed on graphene sheet layers; accumulation of nanometer particles is avoided; the NiCo alloy particles are provided with relatively large specific surface area; cost is low; and batch production can be realized.

Description

technical field [0001] The invention belongs to the field of electrochemistry and relates to a preparation method of a highly dispersed NiCo alloy-graphene nanocomposite catalyst. Background technique [0002] As a point active material, NiCo alloy has been widely used in supercapacitors, lithium-ion batteries, fuel cell electrochemical sensors and electrocatalysis. In order to further improve the catalytic activity, many technologies have been developed for the improvement of NiCo alloy catalysts. One method is to increase the specific surface area by constructing a variety of NiCo alloy nanomaterials with different morphologies, such as NiCo alloys with hollow structures. This hollow structure helps to improve the conduction efficiency of electrons in the electrolyte, but the hollow structure does not Stable, carbon materials are often required as supporting templates to prevent the structure from collapsing during the reaction (Ling Yang, Zhang Min, Zheng Jing, Xu Jingli...

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Problems solved by technology

Another method is to increase the specific surface area by synthesizing ultra-small NiCo alloy nanomaterials. If you want to obtain nanoparticles with small particle sizes, the process required is complicated and the production cost is high, and it is difficult to achieve large-scale production.

On the other hand, based on the principle of thermodynamic minimization, nanoscale catalysts are prone to serious aggregation, resulting in a decrease in mass transfer efficiency (Natalia J. S. Costa, Liane M. Rossi. Synthesis of supported metalnanoparticle catalysts using ligand assisted methods. Nanoscale, 2012, 4( 19):5826-5834)

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