▎ 摘　　要

NOVELTY - Preparing graphene nano-material composite flexible electrode comprises (i) taking 0.5 g graphene oxide powder, adding it to 250 ml deionized water, ultrasonically dispersing for 3 hours at room temperature, and preparing it into graphene oxide solution with concentration of 2 mg/ml and uniform dispersion, (ii) taking 20 ml graphene oxide solution and adding to the polytetrafluoroethylene liner (25 ml) of the hydrothermal reactor, adding 0.5-1 g functional nanomaterials, stirring for 10-15 minutes to disperse evenly, then sonicating for 15-20 minutes to assist graphene oxide to disperse and load the nanomaterials, (iii) enclosing the prepared mixed solution in a polytetrafluoroethylene liner, placing into a steel reaction kettle, heating to 180-200 degrees C for hydrothermal reaction for 12 hours, and then naturally cooling, (iv) cooling to room temperature, opening the reaction kettle, and taking out the three-dimensional cylindrical porous graphene loaded with nanomaterials. USE - The method is useful for preparing graphene nano-material composite flexible electrode. ADVANTAGE - The method: reduces the cost of the process flow; has higher efficiency; is easy to control, safe and non-toxic; reduces the accumulation of nanosheets; and inhibits the agglomeration of nanomaterials. DETAILED DESCRIPTION - Preparing graphene nano-material composite flexible electrode comprises (i) taking 0.5 g graphene oxide powder, adding it to 250 ml deionized water, ultrasonically dispersing for 3 hours at room temperature, and preparing it into graphene oxide solution with concentration of 2 mg/ml and uniform dispersion, (ii) taking 20 ml graphene oxide solution and adding to the polytetrafluoroethylene liner (25 ml) of the hydrothermal reactor, adding 0.5-1 g functional nanomaterials, stirring for 10-15 minutes to disperse evenly, then sonicating for 15-20 minutes to assist graphene oxide to disperse and load the nanomaterials, (iii) enclosing the prepared mixed solution in a polytetrafluoroethylene liner, placing into a steel reaction kettle, heating to 180-200 degrees C for hydrothermal reaction for 12 hours, and then naturally cooling, (iv) cooling to room temperature, opening the reaction kettle, taking out the three-dimensional cylindrical porous graphene loaded with nanomaterials, and repeatedly absorbing water with filter paper, (v) placing the three-dimensional columnar block into the freeze-drying box, using liquid nitrogen to cool down to -55 to 60 degrees C, and performing freeze-drying, (vi) placing the freeze-dried three-dimensional graphene into a ceramic boat and placing it in a tube furnace for high-temperature annealing, before heating in the tube furnace, the ventilation flow is 517 sccm argon for half an hour to clean the tube furnace, then using mechanical pump to vacuum the tube furnace to a pressure of 7.5x 10-2 Torr, turning on the furnace heating program: the heating rate is 10 degrees C/minutes, until 550-580 degrees C, keeping it for 30 minutes, during the heating process, keeping the flow of argon gas at 26 sccm, and always using the mechanical pump to keep the pressure in the furnace stable within 7-8x 10-2 Torr, and (vii) annealing, cooling the system to room temperature, and then obtaining the graphene flexible electrode loaded with nano-materials.