▎ 摘　　要

NOVELTY - Preparing cobalt phosphide/graphene aerogel high-efficiency hydrogen evolution composite material comprises e.g. dissolving cobalt(II) nitrate hexahydrate in deionized water and stirring to obtain cobalt(II) nitrate hexahydrate solution A, adding sodium alginate into deionized water, stirring to obtain sodium alginate solution B, adding graphene oxide solution into solution B, stirring, carrying out ultrasound to obtain dispersion C, adding dispersion C into the solution A, aging, washing, freeze-drying and phosphating. USE - The method is useful for preparing cobalt phosphide/graphene aerogel high-efficiency hydrogen evolution composite material. ADVANTAGE - The material has excellent electro-catalysis hydrogen evolution performance. DETAILED DESCRIPTION - Preparing cobalt phosphide/graphene aerogel high-efficiency hydrogen evolution composite material comprises (i) dissolving cobalt(II) nitrate hexahydrate in deionized water and stirring to obtain 2.5 wt.% cobalt(II) nitrate hexahydrate solution A, (ii) adding sodium alginate (SA) into deionized water and stirring to obtain 1 wt.% sodium alginate solution B, (iii) adding graphene oxide (GO) solution into solution B, stirring, and carrying out ultrasound in the ultrasound system to obtain dispersion C, (iv) adding dispersion C into the solution A at room temperature to obtain hydrogel, and aging formed hydrogel and washing with deionized water and ethanol, (v) freeze-drying the aged, soaked, washed hydrogel in a freeze dryer until a dry gel forms, and (vi) placing the red phosphorus in the upstream of the tube furnace, placing the dry gel formed by adding graphene oxide in downstream, phosphating at high temperature to obtain final product.