▎ 摘　　要

NOVELTY - Method for preparing hydrogel electrode, involves (a) preparing dopamine-modified graphene filler, (b) preparing composite of bimetallic oxide and metal nitride by (i) uniformly mixing and dissolving nitrate, nickelate, ammonium fluoride and urea with pseudocapacitance performance, and uniformly stirring, (ii) soaking nickel substrate wrapped by graphene oxide, and performing hydrothermal reaction, and (iii) thermally treating bimetallic hydroxide, (c) preparing metal organic framework by (I) dissolving at least one nitrate with pseudocapacitance performance, and magnetically stirring, (II) uniformly mixing terephthalic acid and polyvinylpyrrolidone, dissolving, adding solution (A), and uniformly stirring and mixing, and (III) performing hydrothermal reaction, and (d) preparing hydrogel electrode using dopamine-modified graphene, hydrogel monomer and composite of metal organic framework or bimetal oxides and metal nitrides as raw materials. USE - The method is used for preparing multifunctional hydrogel electrode (claimed). The prepared composite energy storage material is used in electrode preparation, cold and heat stimulation or electrical stimulation medical and healthcare applications. ADVANTAGE - The hydrogel electrode has excellent self-adhesion, temperature tolerance, electrical conductivity and energy storage performance, and is adapted to various extreme working environments. DETAILED DESCRIPTION - Method for preparing hydrogel electrode, involves (a) preparing dopamine-modified graphene filler, (b) preparing composite of bimetallic oxide and metal nitride by (i) uniformly mixing and dissolving nitrate, nickelate, ammonium fluoride and urea with pseudocapacitance performance, and uniformly stirring for 0.5-2 hours, (ii) soaking nickel substrate wrapped by graphene oxide in obtained solution for 0.5-1 hour, performing hydrothermal reaction at 120-150degrees Celsius for 15-20 hours, cooling to room temperature, cleaning and drying to obtain bimetallic hydroxide, and (iii) thermally treating bimetallic hydroxide at 400-600degrees Celsius for 2-5 hours, and performing heat treatment at 400-500degrees Celsius for 2-3 hours in ammonia atmosphere to obtain composite of bimetallic oxide and metal nitride, (c) preparing metal organic framework by (I) dissolving at least one nitrate with pseudocapacitance performance, and magnetically stirring for 10-30 minutes to obtain solution (A), (II) uniformly mixing terephthalic acid and polyvinylpyrrolidone, dissolving to obtain solution (B), adding solution (A), and uniformly stirring and mixing for 10-20 minutes, and (III) performing hydrothermal reaction on obtained solution at 100-150degrees Celsius for 20-25 hours, cooling to room temperature, and washing with vacuum to obtain metal organic framework, and (d) preparing hydrogel electrode using dopamine-modified graphene, hydrogel monomer and composite of metal organic framework or bimetal oxides and metal nitrides as raw materials to obtain hydrogel electrode in free radical polymerization manner.