Preparation of graphene composite material and application of graphene composite material in energy storage and conversion
A composite material and graphene technology, applied in fuel cells, electrochemical generators, electrodes, etc., to achieve the effect of improving hydrogen storage capacity and novel preparation methods
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Embodiment 1
[0037] The potassium sulfate solution of 0.5 mol / L was prepared as the electrolyte, the graphite rod as the working electrode, the platinum sheet electrode as the counter electrode. The graphite rod is peeled off through the multi-potential step method to obtain a graphene solution. The multi-potential step method is: step potential 1: -0.5V, time 0.5s; step potential 2: 7V, time 0.5s; step potential 3: 8V, time 0.5s; step potential 4: 9V, Time 0.5s; Step 5: 10V, time 0.5s. The five step potentials were one cycle, cycled for 5,000 cycles to obtain graphene solutions.
[0038] The resulting graphene solution was sufficiently washed and filtered to give graphene powder. A appropriate amount of graphene powder was added to 50 mL of N, N-dimethylformamide solvent, and the graphene suspension was obtained at a 10 W power ultrasound. The grade insertion fluid was filtered in 0.01 MPa by a polytetrafluoroethylene film of 0.2 μm aperture. The graphene film obtained by filtration was all...
Embodiment 2
[0041] The potassium sulfate solution of 0.5 mol / L was prepared as the electrolyte, the graphite rod as the working electrode, the platinum sheet electrode as the counter electrode. Through the multi-potential step method, the graphite rod is peeled, and the multi-potential step method is: step potential 1: -0.3V, time 0.5s; step potential 2: 5V, time 0.5s; step potential 3: 6V, time 0.5S; Step potential 4: 7V, time 0.5s; step potential 5: 8V, time 0.5s. The five step potentials were one cycle, cycled for 5 h, gave a graphene solution.
[0042] The resulting graphene solution was sufficiently washed and filtered to give graphene powder. A appropriate amount of graphene powder was added to 50 mL of N, N-dimethylformamide solvent, and the graphene suspension was obtained at a 10 W power ultrasound. The substrate was filtered in a 0.02 MPa-filtered grade insertion in a substrate with a 0.2 μm aperture. The graphene film obtained by filtration was allowed to be allowed to heat for 4...
Embodiment 3
[0045] The ammonium sulfate solution of 0.5 mol / L was prepared as the electrolyte, the graphite rod was the working electrode, the platinum sheet electrode as the counter electrode. Through the multi-potential step method, the graphite rod is peeled off, and the multi-potential step method is: step potential 1: -0.5V, time 1s; step potential 2: 7V, time 0.2s; step potential 3: 8V, time 0.2 S; step potential 4: 9V, time 0.2s. The four step potentials were one cycle, and the cycle is 7h to obtain a graphene solution.
[0046] The resulting graphene solution was sufficiently washed and filtered to give graphene powder. A appropriate amount of graphene powder was added to 50 mL of ethylene glycol, and the graphene suspension was obtained at a 15 W power ultrasound. The basement is filtered elutiene suspension at 0.05 MPa of the polytetrafluoroethylene film with a pore diameter of 0.2 μm. The graphene film obtained by filtration was allowed to hold at 50 ° C in an oven at 50 ° C for ...
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