▎ 摘　　要

NOVELTY - Multi-stage structure composite material comprises graphene and Nafion poly ions forming macroporous framework, metal nanoparticle nucleation site supported on the macroporous framework, and array of conductive polymer nano-clusters grown in situ on nucleation sites. USE - The composite material is useful for proton exchange membrane fuel cell, super capacitors, or lithium ion battery electrode materials (claimed). ADVANTAGE - The composite material has high conductivity. The method is simple and suitable for batch preparation. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing multi-grade structure composite material, comprising (a) preparing a macroporous framework material carrying metal nanoparticle nucleation site by adding graphite oxide, precious metal precursor salt and Nafion polyion solution into water, uniformly mixing and evaporating the solvent to solid content of 0.5-20%, and carrying out chemical reduction treatment after freeze-drying; and (b) preparing multi-stage structure composite material by taking electrolytic solution containing a conductive polymer precursor small molecule and topography directing agent, and added buffer solution having a pH of 2-13, taking step (a) product as working electrode, subjecting small molecules of conductive polymer and macroporous framework to electrochemical polymerization reaction, to obtain macroporous framework material of three-electrode system.