Self-annealing graphene self-supporting high-temperature electrothermal film and preparation method thereof
A graphene film, self-supporting technology, applied in graphene, electric heating device, ohmic resistance heating and other directions, can solve the problems of complex process, complicated preparation process of electric heating film and high cost, and achieve simple processing process, short response time and cost. low effect
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Embodiment 1
[0038] A kind of preparation method of self-annealing graphene self-supporting high temperature electric heating film, specifically comprises the following steps:
[0039] (1) Immerse the graphite paper as the positive electrode in 98wt% concentrated sulfuric acid, intercalate for 20min under the condition of constant current 0.1A; wrap the graphite paper electrode with PE film after taking out and then completely immerse it in 50wt% sulfuric acid as the positive electrode, at a constant voltage of 10V The exfoliation was complete under the condition of condition; then the electrochemically exfoliated graphene containing functional groups on the surface was obtained by negative pressure filtration, washing with deionized water and drying at room temperature.
[0040] (2) Disperse the electrochemically exfoliated graphene containing functional groups on the surface in deionized water, and ultrasonically disperse it for 60 min to obtain a graphene dispersion with a concentration ...
Embodiment 2
[0045] A kind of preparation method of self-annealing graphene self-supporting high temperature electric heating film, specifically comprises the following steps:
[0046] (1) Immerse the graphite paper as the positive electrode in 98wt% concentrated sulfuric acid, and intercalate for 10 minutes at a constant current of 0.2A; wrap the graphite paper electrode with a PE film after taking it out, and then completely immerse it in 40wt% sulfuric acid as the positive electrode, under a constant current of 12V The exfoliation was complete under the condition of condition; then the electrochemically exfoliated graphene containing functional groups on the surface was obtained by negative pressure filtration, washing with deionized water and drying at room temperature.
[0047] (2) Disperse the electrochemically exfoliated graphene containing functional groups on the surface in deionized water, and ultrasonically disperse for 5 minutes to obtain 0.5 mg / mL graphene dispersion; then filt...
Embodiment 3
[0051] A kind of preparation method of self-annealing graphene self-supporting high temperature electric heating film, specifically comprises the following steps:
[0052] (1) The graphite paper was immersed in 98wt% concentrated sulfuric acid as the positive electrode, and intercalated for 30 minutes at a constant current of 0.1A; after taking out, the graphite paper electrode was wrapped with a PE film and then completely immersed in 60wt% sulfuric acid as the positive electrode, and the constant voltage was 8V. The exfoliation was complete under the condition of condition; then the electrochemically exfoliated graphene containing functional groups on the surface was obtained by negative pressure filtration, washing with deionized water and drying at room temperature.
[0053] (2) The electrochemically exfoliated graphene containing functional groups on the surface was dispersed in deionized water, and ultrasonically dispersed for 90 min to obtain a 5 mg / mL graphene dispersio...
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