▎ 摘　　要

NOVELTY - Preparing multilevel structure composite material involves: pyrolyzing and carbonizing powdered ZIF-67 materials prepared by using a mixed solution of 40-60 mmol/l cobalt(II) nitrate hexahydrate and 110-130 mmol/l 2-methylimidazole to obtain cobalt-nitrogen doped carbon material; mixing graphene oxide suspension with cobalt-nitrogen doped carbon suspension to obtain a mixture (B), ultrasonically dispersing, vacuum filtering, drying, and grinding to obtain a powdered cobalt-nitrogen doped carbon/graphene oxide composite material; oxidizing the composite material to obtain cobalt oxide-nitrogen doped carbon/graphene oxide composite material; and phosphating and selenizing the composite material, and reducing graphene oxide at high temperature to obtain cobalt phosphide-cobalt(II) selenide-nitrogen doped carbon/reduced graphene oxide. USE - The method is useful for preparing multilevel structure composite material used as catalyst for hydrogen evolution by water electrolysis (claimed). ADVANTAGE - The method enables large-scale industrial preparation of multilevel structure composite material using inexpensive raw materials. The composite material has uniform carbon nanotubes growth, controllable doping, multi-stage catalytic site, and high catalytic hydrogen evolution performance.