Porous graphene powder as well as preparation method and application thereof

The invention discloses porous graphene powder as well as a preparation method and application thereof, belonging to the technical field of graphene material preparation. The preparation method for the porous graphene powder comprises the following steps: S1, dissolving expanded graphite in deionized water, and carrying out uniform stirring in a reaction kettle to obtain a dispersion liquid; S2, feeding the dispersion liquid obtained in the step S1 into micro-jet equipment for treatment, and repeating the above steps 3-5 times; S3, subjecting the solution obtained in the step S2 to freeze drying or microwave drying treatment so as to prepare powder; S4, introducing carbon dioxide into the powder obtained in the step S3 for activating treatment; and S5, continuously introducing water vapor into the powder obtained in the step S4 for activation to obtain the porous graphene powder. The preparation method is simple in process, friendly to environment and good in process stability, the pore diameter of the porous