▎ 摘　　要

NOVELTY - Preparing porous graphene, comprises (i) adding mixed solution of water/ethanol, magnetically stirring, ultrasonically dispersing, to obtain colloidal graphene oxide dispersion liquid, adding chemical foaming agent, stirring, filtering, and drying; (ii) extruding solid mixture of graphene oxide and chemical foaming agent; and (iii) soaking extruded graphene in a strong alkaline solution, stirring, and drying to obtain a mixture of graphene and strong alkaline solution, heating, and activating; and adding hydrochloric acid, and neutralizing by adding de-ionized water, and drying. USE - The method is useful for preparing porous graphene (claimed). ADVANTAGE - The method has simple preparation procedure, and easy commercial production capacity; and is economical. The porous graphene prepared has specific surface area which can reach up to 2075 m2/g, pore volume of 1.8 cm3/g, average pore diameter is 1-7 nm, and high specific capacitance, and cyclic stability; and is utilized in super-capacitor electrode material 1-silver (Ag) whose current density capacitance can reach up to 155 F/g, and the specific capacitance of the porous graphene electrode along with the current density is 84.4% which increases from 0.2 Ag-1 to 20 Ag-1. DETAILED DESCRIPTION - Preparing porous graphene, comprises (i) adding mixed solution of water/ethanol, where the pH of the solution is 9-10, and the volume ratio of water to ethanol is 2:1, and magnetically stirring for 48-72 hours, ultrasonically dispersing for 0.5-2 hours, to obtain colloidal graphene oxide dispersion liquid, and controlling the concentration of the graphene oxide at 0.5-5 mg/ml, then adding the chemical foaming agent, stirring for 2-12 hours, filtering to remove the excess chemical foaming agent, and drying to obtain solid mixture of graphene oxide and chemical foaming agent; (ii) extruding solid mixture of graphene oxide and chemical foaming agent by placing in a tubular furnace under reduced atmosphere at room temperature, slowly increasing the room temperature to 500 degrees C, controlling the heating rate at 2-10 degrees C/minute, and incubating for 15-30 minutes at 200 degrees C, and incubating for 1-2 minutes at 500 degrees C respectively, and obtaining extruded grapheme; and (iii) soaking extruded graphene in a strong alkaline solution, controlling the mass ratio of extruded graphene with strong alkaline solution to 1:4-10, completely stirring, and drying to obtain a mixture of graphene and strong alkaline solution, then placing the mixture in the tubular furnace under inert gas protection, heating at 700-1000 degrees C, activating for 0.5-3 hours under constant temperature, and obtaining activated product of graphene with strong alkali; and adding the activated product with 0.5-2 mol/l hydrochloric acid, and neutralizing by adding de-ionized water, and drying to obtain the target product.