A kind of graphene-gold composite electrode and its preparation method and application
A composite electrode and graphene technology, which is applied in the field of composite electrodes for lithium-air batteries, can solve problems such as complex methods, and achieve the effects of simple process, reduced overpotential, and improved catalytic performance
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Embodiment 1
[0039] Put porous nickel (96% porosity, 1.6mm thickness) into a tube furnace, heat up to 1000°C at a rate of 100°C / min under an Ar (500s.c.c.m.) atmosphere; Ar (250s.c.c.m.) air flow introduces ethanol into the quartz tube and reacts for 5 minutes; finally, cools to room temperature at a cooling rate of 100°C / min under Ar atmosphere to obtain graphene (Ni / G) grown on a porous nickel substrate. , where the loading capacity of graphene is 0.82mg / cm 2 ; the HAuCl 4 4H 2 O was dissolved in deionized water and stirred evenly to prepare a solution with a concentration of 0.16 mg / mL, and the beaker containing the above solution was placed in an ice bath and stirred slowly for 1 hour; Ni / G was immersed in the above solution and stood for 3 hour, the reaction product was taken out, washed repeatedly by deionization and vacuum-dried at 60°C; the resulting product was baked at 300°C for 2 hours under an Ar atmosphere, then cooled to room temperature to obtain a G-Au composite electrode...
Embodiment 2
[0050] Put porous nickel (90% porosity, 2.5mm thickness) into a tube furnace, and heat up to 1000°C at a rate of 100°C / min under an Ar (500s.c.c.m.) atmosphere; Ar (250s.c.c.m.) air flow introduces ethanol into the quartz tube and reacts for 8 minutes; finally, it is cooled to room temperature at a cooling rate of 100°C / min under Ar atmosphere to obtain graphene (Ni / G) grown on a porous nickel substrate. , where the loading capacity of graphene is 1.25mg / cm 2 ; the HAuCl 4 4H 2 O was dissolved in deionized water and stirred evenly to prepare a solution with a concentration of 0.1 mg / mL, and the beaker containing the above solution was placed in an ice bath and stirred slowly for 1 hour; Ni / G was immersed in the above solution and stood for 3 hour, the reaction product was taken out, washed repeatedly by deionization and vacuum-dried at 60°C; the resulting product was baked at 200°C under Ar atmosphere for 4 hours, then cooled to room temperature to obtain a G-Au composite el...
Embodiment 3
[0054] Put porous aluminum (85% porosity, 2mm thickness) into a tube furnace, and heat up to 1000°C at a rate of 100°C / min in an Ar (500s.c.c.m.) atmosphere; (250s.c.c.m.) air flow introduces ethanol into the quartz tube and reacts for 3 minutes; finally, it is cooled to room temperature with a cooling rate of 100°C / min under Ar atmosphere to obtain graphene (Al / G) grown on the porous aluminum substrate. Among them, the loading capacity of graphene is 0.55mg / cm 2 ; the HAuCl 4 4H 2 O was dissolved in deionized water and stirred evenly to prepare a solution with a concentration of 0.2 mg / mL, and the beaker containing the above solution was placed in the ice-water mixture, and stirred slowly for 1.5 hours; the Al / G was immersed in the above solution, and the Leave it for 4 hours, take out the reaction product, wash it repeatedly with deionization, and dry it in vacuum at 60°C; bake the obtained product at 300°C for 2.5 hours in an Ar atmosphere, and then cool to room temperatu...
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