▎ 摘　　要

NOVELTY - A composite graphene aerogel comprises regenerated silk protein and graphene material. The aerogel has a density of 11.1-14.1 mg.cm-3, and a beta -folded microcrystalline structure having beta -chains. The mass ratio of an aerogel electrode is 113.2-128.4 Fg-1. The adjacent beta -chains in the structure is connected by strong hydrogen bonds in an anti-parallel arrangement, and contain 65-75 atomic% carbon, 6-20 atomic% nitrogen, 8-23 atomic% oxygen and 0.1-0.5 atomic% calcium. USE - Composite graphene aerogel used in supercapacitive pressure sensor (claimed) for electrochemical energy storage applications. ADVANTAGE - The aerogel has excellent mechanical strength, elasticity, compressibility, sensitivity of 0.73 kPa, stable strain electrical response and ultra-sensitive detection limit, and provides sensor having excellent supercapacitor characteristics and cycle stability. The sensor can effectively sense strain of 0.012% and even small changes in pressure (0.25Pa) to effectively detect low pressure. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) preparation of the aerogel, which involves boiling 0.2-0.3 M sodium carbonate solution with silk for 30-40 minutes, washing with deionized water for 2-3 times, drying for 3-4 days at 60-70 degrees C to obtain a degumming fiber, mixing anhydrous calcium chloride, ethanol, water in a mol ratio of 1:(6-8):(1-2) to obtain a mixed solution (A), dissolving the degumming fiber in the mixed solution (A) at 80-110 degrees C, stirring for 30-40 minutes, pouring into a dialysis bag having 3500-4500 intercepted molecular weight, dialyzing for 3-4 days in the deionized water, centrifuging for 30-40 minutes at 6000-7000 rpm and extracting supernatant to obtain a regenerated silk protein solution, ultrasonically dispersing 80-100 mg graphene oxide in 8-10 mL deionized water and 0.5-0.6 mL ammonia solution for 60-80 minutes to obtain a precursor solution (A), mixing 3-4 mL precursor solution (A) with 0.1-0.6 mL regenerated silk protein solution and 3-4 mL deionized water to obtain a precursor solution (B), reacting precursor solution (B) with PTFE lining for 12-14h in a high pressure kettle at 100-120 degrees C, cooling to room temperature to obtain a composite graphene hydrogel, mixing ethanol and deionized water in a volume ratio of 1:(90-110) to obtain a mixed solution (B), dialyzing the hydrogel in the mixed solution (B) for 6-8 hours, freezing for 22-24 hours, and freeze-drying for 20-24 hours; and (2) application of the aerogel in a supercapacitive pressure sensor.