Preparation method of graphene electrode material for supercapacitor
A technology for supercapacitors and electrode materials, applied in the field of materials science, can solve problems such as stacking and poor conductivity, and achieve the effects of reducing aggregation and stacking, good conductivity, and good structural stability
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Embodiment 1
[0024] The graphene quantum dot / nanoporous gold composite structure supercapacitor electrode material is prepared by the following steps:
[0025] (1) Take the nanoporous gold film, wash it twice with deionized water, and take it out with a copper sheet.
[0026] (2) The NPG film was placed in an aqueous solution of graphene quantum dots with a concentration of 0.02 g / L, and a mass concentration of 0.05% PEG was added. A three-electrode system was used to deposit graphene quantum dots by cyclic voltammetry with a voltage window of 0-1V, 50 cycles, and a scan rate of 20mVs -1 . That is, the graphene quantum dot / nanoporous gold composite structure supercapacitor electrode material is obtained.
[0027] The above graphene quantum dots / nanoporous gold composites were tested by transmission electron microscopy, see appendix figure 1 . from figure 1 It can be seen that the graphene quantum dots are spherical single particles distributed on the nanoporous gold pore walls, and th...
Embodiment 2
[0031] The graphene oxide / nanoporous gold composite structure supercapacitor electrode material is prepared by the method of the following steps:
[0032] (1) Take the nanoporous gold film, wash it twice with deionized water, and take it out with a copper sheet.
[0033] (2) The NPG film was placed in a graphene oxide aqueous solution with a concentration of 0.5 g / L. Using a three-electrode system, the graphene oxide material was deposited by cyclic voltammetry, the voltage window was 0-2V, the number of cycles was 500, and the scan rate was 200mVs -1 . That is, the graphene oxide / nanoporous gold composite structure supercapacitor electrode material is obtained.
[0034] (3) The prepared graphene oxide / nanoporous gold composite structure supercapacitor electrode material is at 500 o C, heat treatment for 120 minutes.
[0035] The above graphene oxide / nanoporous gold composites were tested by transmission electron microscopy, see appendix image 3 . from image 3 It can ...
Embodiment 3
[0038] The nitrogen-doped graphene quantum dot / nanoporous gold composite structure supercapacitor electrode material is prepared by the method of the following steps:
[0039] (1) Take the nanoporous gold film, wash it twice with deionized water, and take it out with a copper sheet.
[0040](2) The NPG film was placed in an aqueous solution of nitrogen-doped graphene quantum dots with a concentration of 0.1 g / L, and a mass concentration of 0.05% vitamin C was added. Using a three-electrode system, the graphene quantum dots were deposited by cyclic voltammetry, the voltage window was 0-1.6V, the number of cycles was 200 cycles, and the scan rate was 100mVs -1 . The nitrogen-doped graphene quantum dots / nanoporous gold composite structure supercapacitor electrode material is obtained.
[0041] The above nitrogen-doped graphene quantum dots / nanoporous gold composites were tested by transmission electron microscopy, see appendix Figure 5 . from Figure 5 It can be seen that t...
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