▎ 摘　　要

NOVELTY - A heavy-load nano-catalyst preparing method involves dispersing oxidation graphene powder in deionized water and graphene oxide solution by using ultrasonic condition. An ultrasonic treatment process is carried out. A drying process is carried out by using liquid nitrogen. The porous graphite is placed in a tubular furnace to carry out annealing process. The porous graphite is provided in a system for cooling process at room temperature to obtain a heavy-load nano-catalyst. USE - Method for preparing heavy-load nano-catalyst for use in three-dimensional graphene electrode for PEC battery. . DETAILED DESCRIPTION - A heavy-load nano-catalyst preparing method involves dispersing oxidation graphene powder in deionized water and graphene oxide solution by using ultrasonic condition. Oxidation graphite alkene solution and active nano material are taken and added with catalyst in a hydro-thermal reaction kettle. The taken solution is mixed uniformly. An ultrasonic treatment process is carried out. The mixed solution is provided in the kettle, and cooling process is performed at room temperature to obtain a three-dimension cylindrical loading semiconductor nano material that is provided as porous graphite. The porous graphite is provided in a freeze drying box for carrying out freezing process. A drying process is carried out by using liquid nitrogen. The porous graphite is provided in a ceramic boat after freezing and drying process. The porous graphite is placed in a tubular furnace to carry out annealing process. The porous graphite is provided in a system for cooling process at room temperature to obtain a heavy-load nano-catalyst..