A kind of graphene composite catalyst for fuel cell and preparation method thereof

Abstract

The invention provides a graphene composite catalyst for a fuel cell and a preparation method of the graphene composite catalyst. The method comprises the steps of evenly dispersing graphite and a metal salt as raw materials in a starch solution; gelatinizing the starch solution; forming gel; and carrying out shearing and peeling to obtain an evenly dispersed graphene composite material, and then reducing the metal salt and decomposing starch through heating to obtain metal nanoparticles of which the surfaces are coated with carbon layers, wherein the metal nanoparticles are evenly dispersed on a graphene carrier, and the resistivity performance of catalyst proton flow is excellent. According to the graphene composite catalyst, the problem of high cost due to the fact that graphene is directly adopted as the raw material in the prior art and the problem of graphene aggregation are solved, so that continuous and stable preparation of the graphene composite material is achieved, meanwhile, the problem of uneven distribution of the nanoparticles and the problem of poor stability of iron, cobalt and nickel metal catalysts are solved, mass production of the graphene catalyst for the fuel cell is further promoted and the graphene composite catalyst has significant market application value.

Description

technical field [0001] The invention relates to a graphene composite fuel cell catalyst, in particular to a graphene composite catalyst for a fuel cell and a preparation method thereof. Background technique [0002] In 2004, two scientists from the University of Manchester in the United Kingdom discovered graphene using the method of micromechanical exfoliation, and won the Nobel Prize in Physics in 2010. Graphene is a single atom thick and has sp 2 The flat plate structure of bonded carbon atoms, in theory, has a perfect hexagonal network structure, showing excellent electronic stability, thermal conductivity, optical properties, mechanical properties, etc. Since the discovery of graphene, due to its excellent performance and huge market application prospects, it has triggered a research boom in the fields of physics and material science. [0003] With the depletion of fossil energy such as coal and oil, human society is facing an increasingly serious energy crisis. In th...

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Problems solved by technology

[0009] Aiming at the problem that graphene and precious metals are directly used as raw materials for fuel cell catalysts at present, the cost is high, the process continuity is poor, and large-scale production cannot be carried out, and the catalyst prepared by compounding graphene and iron-cobalt-nickel metal has poor stability. Graphene composite catalysts for fuel cells and their preparation methods, so as to achieve continuous and stable preparation of graphene composite materials, while solving the problem of uneven distribution of nanoparticles and poor stability of iron-cobalt-nickel metal catalysts, further promoting large-scale Production of graphene fuel cell catalysts