Preparation of a graphene composite and its application in energy storage and conversion
A composite material and graphene technology, applied in fuel cells, electrochemical generators, structural parts, etc., to achieve the effect of novel preparation methods and improved hydrogen storage capacity
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Embodiment 1
[0037] A 0.5 mol / L potassium sulfate solution was prepared as the electrolyte, the graphite rod was used as the working electrode, and the platinum sheet electrode was used as the counter electrode. The graphene solution was obtained by exfoliating the graphite rod by the multipotential step method. The multi-potential step method used 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 potential 5: 10V, time 0.5s. Five step potentials are one cycle, and five thousand cycles are cycled to obtain a graphene solution.
[0038] The prepared graphene solution is fully washed and filtered to obtain graphene powder. An appropriate amount of graphene powder was added to 50 mL of N,N-dimethylformamide solvent, and the graphene suspension was obtained by ultrasonicating at a power of 10W for 15 minutes. The graphene suspension was suction filtered at 0.01 MPa with a 0.2 μm pore size PTFE film...
Embodiment 2
[0041] A 0.5 mol / L potassium sulfate solution was prepared as the electrolyte, the graphite rod was used as the working electrode, and the platinum sheet electrode was used as the counter electrode. The graphite rod was exfoliated by the multi-potential step method. The multi-potential step method used was: 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 are one cycle, and the cycle is 5h to obtain the graphene solution.
[0042] The prepared graphene solution is fully washed and filtered to obtain graphene powder. An appropriate amount of graphene powder was added to 50 mL of N,N-dimethylformamide solvent, and the graphene suspension was obtained by ultrasonicating at a power of 10W for 15 minutes. The graphene suspension was suction filtered at 0.02 MPa with a 0.2 μm pore size PTFE film as the base. The graphene membrane obtained...
Embodiment 3
[0045] A 0.5 mol / L ammonium sulfate solution was prepared as the electrolyte, the graphite rod was used as the working electrode, and the platinum sheet electrode was used as the counter electrode. The graphite rod is exfoliated by the multi-potential step method. The multi-potential step method used 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. Four step potentials are one cycle, and the graphene solution is obtained by cycling for 7 h.
[0046] The prepared graphene solution is fully washed and filtered to obtain graphene powder. An appropriate amount of graphene powder was added to 50 mL of ethylene glycol, and the graphene suspension was obtained by ultrasound at a power of 15 W for fifteen minutes. The graphene suspension was suction filtered at 0.05 MPa using a 0.2 μm pore size PTFE film as the base. The graphene membrane obtained by suction filtration was kept for 10 hours and...
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