▎ 摘　　要

NOVELTY - Preparation of graphene based on layered dihydroxy metal hydroxide comprises taking layered dihydroxy metal hydroxide (I) as catalyst precursor and putting into reactor; heating the layered dihydroxy metal hydroxide to pretreatment temperature; feeding mixed gas of carbon source, hydrogen, and carrier gas into the reactor; reacting by chemical vapor deposition; depositing graphene on the layered dihydroxy metal oxide film; purifying the product; and obtaining high-purity graphene. USE - Preparation of graphene based on layered dihydroxy metal hydroxide (claimed). ADVANTAGE - The method is simple and easy for large-scale implementation. DETAILED DESCRIPTION - Preparation of graphene based on layered dihydroxy metal hydroxide comprises: (A) taking layered dihydroxy metal hydroxide of formula M2+1-xM3+x(OH)2(A raised to n-)x/n.mH2O (I) as catalyst precursor and putting into reactor, where the molar ratio of M2+ and M3+ is 1-4; (B) heating the layered dihydroxy metal hydroxide to pretreatment temperature of 300-1200 degrees C; (C) feeding mixed gas of carbon source, hydrogen, and carrier gas at 0-2:1:0.1-6 volume ratio into the reactor; reacting at 600-1200 degrees C by chemical vapor deposition; and depositing graphene on the layered dihydroxy metal oxide film; and (D) purifying the product and obtaining high-purity graphene. x=molar ratio of M3+ and (M2+ plus M3+); m=number of water molecules in the layer; M2+=Mg2+, Ca2+, Mn2+, Fe2+, Co2+, Ni2+, and/or Cu2+; M3+=Al3+, Co3+, Fe3+, and/or Ru3+;and A raised to n-=anion of n valence, where anion is Cl-, OH-, NO3-, SO42-, and/or CO32-, and can also include organic anion and isopolyacid or heteropolyacid anion containing Mo or W.