▎ 摘　　要

NOVELTY - A three-dimensional graphene or graphene-like foam is prepared by successively performing step (a) of providing three-dimensional metal foam framework, step (b) of depositing graphene onto metal foam framework, so that graphene reproduces morphology of metal foam framework for forming three-dimensional graphene or graphene-like foam deposited onto metal foam framework, and step (c) of introducing three-dimensional graphene or graphene-like foam deposited onto metal foam framework obtained in step (b) in electrochemical cell, in which electrochemical cell comprises greater than or equal to 3 electrodes. USE - Preparation of three-dimensional graphene or graphene-like foam for electrode and current collector used for electrochemical energy storage device (all claimed). ADVANTAGE - The preparation method is simple and straightforward, and allows obtaining high quality graphene foams or graphene-like foam in one step for reducing production costs. Damage of foam's structure during metal foam removal is avoided. DETAILED DESCRIPTION - A three-dimensional graphene or graphene-like foam is prepared by successively performing step (a) of providing three-dimensional metal foam framework, step (b) of depositing graphene onto metal foam framework, so that graphene reproduces morphology of metal foam framework for forming three-dimensional graphene or graphene-like foam deposited onto metal foam framework, step (c) of introducing three-dimensional graphene or graphene-like foam deposited onto metal foam framework obtained in step (b) in electrochemical cell, in which electrochemical cell comprises greater than or equal to 3 electrodes, and electrochemical solution having standard reduction potential (E0) of less than or equal to 0.22 V, and electrochemical solution is devoid of any complexing agent, and step (d) of applying voltage scanning within - 0.8-0.8 V to electrochemical cell used in step (c) to produce partial or total dissolution of metal foam framework. INDEPENDENT CLAIMS are included for: (1) three-dimensional graphene foam or graphene-like foam in which metal foam framework is partially dissolved, so as graphene foam or graphene-like foam comprises metal foam framework having uniform thickness of 50-500 nm homogeneously distributed throughout the graphene foam or graphene-like foam; (2) preparation of functionalized three-dimensional graphene or graphene-like foam which involves successively performing step (a) of providing three-dimensional metal foam framework, step (b) of depositing graphene onto metal foam framework, so that graphene reproduces the morphology of metal foam framework for forming three-dimensional graphene or graphene-like foam deposited onto metal foam framework, step (c) of introducing three-dimensional graphene or graphene-like foam deposited onto metal foam framework obtained in step (b) in electrochemical cell, step (d) of applying voltage scanning at - 0.8-0.8 V to electrochemical cell used in step (c) to produce partial or total dissolution of metal foam framework, and step (e) of functionalizing three-dimensional graphene or graphene-like foam obtained in step (d) by electrodeposition in electrochemical solution comprising functionalizing agents or its precursors; and (3) functionalized three-dimensional graphene or graphene-like foam.