▎ 摘　　要

NOVELTY - Preparing nitrogen-boron doped graphene/silver-doped polypyrrole oxide (NBGA/RGO/PPy/Ag) asymmetric elastic supercapacitive piezoelectric sensor involves preparing nitrogen-boron doped graphene aerogel electrode, mixing 2 mg/ml boric acid solution, 5 mg/ml graphene oxide solution and 28 wt.% ammonia solution according to volume ratio of 3-18:600:10. The mixed solution is ultrasonically processed for 60-90 minutes to make it uniformly distributed. The mixed solution is put in an autoclave at 120-140 degrees C for a hydrothermal reaction for 12-14 hours, after the reaction is completed, stand at room temperature to form a hydrogel. The hydrogel is taken out in the reaction vessel, dialyzed under solvent for 6 hours, rinsed off the excess dialysate and freeze-dried at -18 degrees C for 48 hours, then taken out the sample and dried naturally to form nitrogen-boron doped graphene (NBGA). The NBGA is used as the positive electrode material, where NBGA stands for nitrogen-boron doped graphene aerogel. USE - Method for preparing NBGA/RGO/PPy/Ag asymmetric elastic supercapacitive piezoelectric sensor. ADVANTAGE - The method enables to prepared NBGA/RGO/PPy/Ag asymmetric elastic supercapacitive piezoelectric sensor in a simple and efficient way, has good reproducibility, and can be prepared on a large scale, and prepared device has the characteristics of larger power density, wider operating voltage window, rapid charge and discharge and the like, and combined with the field of piezoelectric sensors, it broadens the application fields of supercapacitors and optimizes the resistance of sensor modules in complex environments. DETAILED DESCRIPTION - Preparing nitrogen-boron doped graphene/silver-doped polypyrrole oxide (NBGA/RGO/PPy/Ag) asymmetric elastic supercapacitive piezoelectric sensor involves preparing nitrogen-boron doped graphene aerogel electrode, mixing 2 mg/ml boric acid solution, 5 mg/ml graphene oxide solution and 28 wt.% ammonia solution according to volume ratio of 3-18:600:10. The mixed solution is ultrasonically processed for 60-90 minutes to make it uniformly distributed. The mixed solution is put in an autoclave at 120-140 degrees C for a hydrothermal reaction for 12-14 hours, after the reaction is completed, stand at room temperature to form a hydrogel. The hydrogel is taken out in the reaction vessel, dialyzed under a solvent for 6 hours, rinsed off the excess dialysate and freeze-dried at -18 degrees C for 48 hours, then taken out the sample and dried naturally to form nitrogen-boron doped graphene (NBGA). The NBGA is used as the positive electrode material, where NBGA stands for nitrogen-boron doped graphene aerogel. The 3 mg/ml graphene oxide solution, 1mg/ml silver nitrate (AgNO3) solution, 10 mg/ml polypyrrole (PPy) ethanol solution is taken according to the volume ratio of 40:5-15:1. The mixed solution is ultrasonically treated for 60-90 minutes to make uniformly distributed. The mixed solution is placed in an autoclave at 120-140 degrees C for 12-14 hours for hydrothermal reaction. The reaction is completed, and kept at room temperature to form a hydrogel. The hydrogel is taken out in the reaction kettle, dialyzed under the solvent for 6 hours, rinsed off the excess dialysate and put into -18 degrees C for 48 hours to freeze-dried. The sample is taken out and dried naturally to form silver-doped polypyrrole oxide (RGO/PPy/Ag), where using RGO/PPy/Ag as the negative electrode material. The solid-state asymmetric supercapacitor piezoelectric sensor are assembled, and cut the positive and negative electrode materials into slices of a certain area. The two nickel sheets are taken with an area of 2x 2 cm. The area of the positive and negative electrode materials is smaller than that of the nickel sheet. A tablet press is used to press the positive and negative electrode materials on the nickel sheet respectively under a pressure of 10 megapascal, and soaked the pressed nickel sheet in 6mol/L potassium hydroxide (KOH) for 6 hours. The potassium hydroxide/polyvinly alcohol (KOH/PVA) gel electrolyte is prepared, taken an appropriate amount and coated on the nickel sheet with the positive and negative electrode materials, so that the positive and negative electrode materials of the nickel sheet are facing, and pressed and dried at room temperature to complete the assembly of the all-solid asymmetric supercapacitor.