A kind of three-dimensional graphene-based composite electrode and its preparation method and application
A graphene-based composite electrode technology, which is applied in the field of composite electrodes for lithium-air batteries, can solve the problems of no three-dimensional graphene-based composite electrode materials, and achieve the effects of improved cycle stability, improved catalytic performance, and low cost
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Embodiment 1
[0035] Put nickel foam into a tube furnace, and raise the temperature to 1000°C at a rate of 100°C / min under an Ar (500s.c.c.m.) atmosphere; after holding for 5 minutes, introduce ethanol into the quartz tube with an Ar (250s.c.c.m.) airflow , reacted for 5 minutes; finally, cooled to room temperature at a cooling rate of 100°C / min in an Ar atmosphere to obtain three-dimensional graphene (Ni / 3D-G) grown on a nickel foam substrate, in which the loading capacity of graphene was 0.85mg / cm 2 ; the KMnO 4 and 96wt%H 2 SO 4 (molar KMnO 4 0.25) dissolved in deionized water, stirred evenly, prepared with K + A solution with a concentration of 0.01mol / L. Use Ni / 3D-G as the matrix, immerse in the above solution, and then transfer it into the reaction kettle, seal it and keep it in an oven at 85°C for 2 hours, then rinse it with deionized water and absolute alcohol several times, and put it in an oven at 60°C Manganese hydroxide loaded on Ni / 3D-G was obtained after vacuum drying f...
Embodiment 2
[0045] Put nickel foam into a tube furnace, and raise the temperature to 1000°C at a rate of 100°C / min under an Ar (500s.c.c.m.) atmosphere; after holding for 5 minutes, introduce ethanol into the quartz tube with an Ar (250s.c.c.m.) airflow , reacted for 8 minutes; finally, cooled to room temperature at a cooling rate of 100°C / min in an Ar atmosphere to obtain three-dimensional graphene (Ni / 3D-G) grown on a nickel foam substrate, in which the loading capacity of graphene was 1.3mg / cm 2 ; the KMnO 4 and 96wt%H 2 SO 4 (molar mass is KMnO 4 0.5) was dissolved in deionized water, stirred evenly, prepared in K + A solution with a concentration of 0.005 mol / L. Use Ni / 3D-G as the matrix, immerse in the above solution, and then transfer it into the reaction kettle, seal it and keep it in an oven at 90°C for 2 hours, then rinse it with deionized water and absolute alcohol several times, and put it in an oven at 60°C After vacuum drying for 12 hours, the Ni / 3D-G loaded with mang...
Embodiment 3
[0049] Put nickel foam into a tube furnace, and raise the temperature to 1000°C at a rate of 100°C / min under an Ar (500s.c.c.m.) atmosphere; after holding for 5 minutes, introduce ethanol into the quartz tube with an Ar (250s.c.c.m.) airflow , reacted for 3 minutes; finally, cooled to room temperature at a cooling rate of 100°C / min in an Ar atmosphere to obtain three-dimensional graphene (Ni / 3D-G) grown on a nickel foam substrate, in which the loading capacity of graphene was 0.5mg / cm 2 ; the KMnO 4 and 96wt%H 2 SO 4 (molar KMnO 4 0.3) was dissolved in deionized water, stirred well, prepared in K + A solution with a concentration of 0.02mol / L. Use Ni / 3D-G as the matrix, immerse in the above solution, and then transfer it into the reaction kettle. After sealing it, keep it in an oven at 80°C for 1 hour, then rinse it with deionized water and absolute alcohol several times, and put it in an oven at 60°C. After vacuum drying for 12 hours, the Ni / 3D-G loaded with manganese ...
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