▎ 摘　　要

NOVELTY - Two-dimensional porous carbon composite material comprises two-dimensional graphene alkenyl or MXene-based porous carbon and metal, alloy or intermetallic compound nanoparticles distributed in the porous carbon pores. USE - Two-dimensional porous carbon composite material used as electrode catalyst of fuel cell, and as catalyst for electrolysis of water to produce hydrogen and oxygen, and to reduce carbon dioxide (all claimed). ADVANTAGE - The two-dimensional porous carbon composite material exhibits very high electro-catalytic activity for oxidation of hydrogen and methanol and reduction of oxygen and stability, so as to improve performance of fuel cell. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing two-dimensional porous carbon composite material, which involves graphene nanometer sheet by electrochemical peeling method, preparing MXene nanosheet by hydrofluoric acid (HF) etching method, dispersing graphene or MXene nanosheet ultrasonically in polar aprotic solvent, adding organic ligand and metal precursor into solution, stirring for 10 hours at room temperature to obtain graphene or MXene nanosheet whose surface is covered by metal organic frame material, preparing alloy, adding two metal precursors at the same time, preparing inter-metallic compound, adding second metal precursor into suspension, adding reducing agent to suspension, stirring for 2-4 hours, centrifuging and washing, vacuum drying, and roasting the obtained solid powder in tubular furnace at 500-1000 degrees C for 2-5 hours to obtain two-dimensional porous carbon composite material.