Grapheme-polyaniline super capacitor electrode material and preparation method thereof

A technology for supercapacitors and electrode materials, which is applied in the manufacture of hybrid capacitor electrodes and hybrid/electric double layer capacitors. The effect of pseudocapacitance

Inactive Publication Date: 2013-06-05
YANSHAN UNIV
3 Cites 23 Cited by

AI-Extracted Technical Summary

Problems solved by technology

This method mainly obtains graphite oxide single-layer/polyaniline single-layer conductive film through electrostatic attraction and oxidative doping, and the substrate is directly used as a current collector, which simplifies the operation, but becau...
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Abstract

The invention provides a grapheme-polyaniline super capacitor electrode material which refers to a composite electrode material composed of the polyaniline which deposits on the surface of the grapheme in a constant potentials mode. The shape of the polyaniline is self-supporting and is gained by electrolyzing graphite paper. The polyaniline is on the basement of the graphite paper. The preparation comprise a step of connecting the graphite paper with a positive and negative electrode, immersing the graphite paper in the electrolyte with the process of electrolyzation in 5-50 minutes; a step of taking out the graphite paper of the positive electrode which is washed with distilled water and is dried in a vacuum drying oven; a step of regarding a saturated Ag/AgC1 electrode as a reference electrode and a platinum sheet as a auxiliary electrode. The electrolytic graphite paper which is dealt with positive electrode is regarded as a working electrode. The polyaniline is deposited in the mixed solution of aniline and H2SO4, the deposition voltage is 0.5-1.2 V and the polyaniline is deposited for 1-40minutes. The graphite paper is washed by the distilled water and then is dried by putting into the vacuum drying oven after the graphite paper is taken out. The method has the advantages of being simple in preparation technology, low in cost and avoiding effectively the grapheme from overlapping so as to gain a well conductive electrode material.

Application Domain

Hybrid capacitor electrodesHybrid/EDL manufacture

Technology Topic

Cvd grapheneAuxiliary electrode +16

Image

  • Grapheme-polyaniline super capacitor electrode material and preparation method thereof
  • Grapheme-polyaniline super capacitor electrode material and preparation method thereof
  • Grapheme-polyaniline super capacitor electrode material and preparation method thereof

Examples

  • Experimental program(6)

Example Embodiment

[0032] Example 1
[0033] Cut the graphite paper sheet into a 1×3cm rectangle with scissors, and the edges of the cut graphite paper sheet should be neat. Use a red carbon pen to draw a line 1cm away from one end of the graphite paper on one side of the graphite paper to make it a 1×1cm square as the electrolysis site. Add 20mL of electrolyte solution into a round dry and clean glass dish with a specification of 50×30mm. The electrolyte solution is sulfuric acid with a pH value of 1.3. The electrolysis device is a DC power supply. Take two cut graphite paper sheets and connect them to the power supply For the positive and negative electrodes, the ends (1×1cm) of the two pieces of graphite paper closest to the straight line are completely submerged below the liquid level of the electrolyte, the straight line is level with the liquid level, and the two electrodes are facing each other in parallel with a distance of 1 cm. When starting electrolysis, slowly adjust the voltage to 8.0V (the field strength is 800V/m), and the electrolysis time is 10min. After that, take out the graphite paper sheet of the anode, and rinse the electrolysis part with distilled water until the pH is 7. At this time, it can be seen in the electrolysis part Turned graphene. The rinsed graphite paper sheets were dried in a vacuum oven at 80°C for 30 min.
[0034] like figure 1 As shown, it can be seen that the originally smooth graphite paper becomes rolled-up tulle-like folds under electrolytic conditions, which is the appearance of self-supporting graphene.
[0035] With the saturated Ag/AgCl electrode as the reference electrode, the platinum sheet as the counter electrode, and the above-mentioned dried graphite paper sheet as the working electrode, add 50 mL of aniline with a concentration of 0.05 mol/L and a concentration of 0.5 mol into a 150 mL beaker. /L of H 2 SO 4 The mixed solution was used as the bottom liquid, and the deposition was started, the deposition voltage was kept at 1.0V, and the deposition time was 5min. After the deposition was completed, the graphite paper sheet was taken out, washed with distilled water until the pH was 7, and then dried in a vacuum oven at 80°C for 4 h.
[0036] like figure 2 As shown, a layer of polyaniline (PANI) is profilically grown on the turned-up graphene surface, and graphene and polyaniline are tightly combined to form a graphene-polyaniline composite material.
[0037] like image 3 As shown, the scan rates are 100, 50, 20, and 10 mV/s respectively, and the mass specific capacitance based on the polyaniline (PANI) graphene-polyaniline electrode material is calculated to be 210 F/g.

Example Embodiment

[0038] Example 2
[0039] Cut the graphite paper sheet into a 1×3cm rectangle with scissors, and the edges of the cut graphite paper sheet should be neat. Use a red carbon pen to draw a line 1cm away from one end of the graphite paper on one side of the graphite paper to make it a 1×1cm square as the electrolysis site. Add 20mL of electrolyte solution into a round dry and clean glass dish with a specification of 50×30mm. The electrolyte solution is sulfuric acid with a pH value of 2.3. For the positive and negative electrodes, the ends (1×1cm) of the two pieces of graphite paper closest to the straight line are completely submerged below the liquid level of the electrolyte, the straight line is level with the liquid level, and the two electrodes are facing each other in parallel with a distance of 1 cm. When starting electrolysis, slowly adjust the voltage to 8.0V (the field strength is 800V/m), and the electrolysis time is 10min, then take out the graphite paper sheet of the anode, and rinse the electrolysis part with distilled water until the pH reaches 7. The rinsed graphite paper sheets were dried in a vacuum oven at 80°C for 30 min.
[0040]With the saturated Ag/AgCl electrode as the reference electrode, the platinum sheet as the counter electrode, and the above-mentioned dried graphite paper sheet as the working electrode, add 50 mL of aniline with a concentration of 0.05 mol/L and a concentration of 0.5 mol into a 150 mL beaker. /L H 2 SO 4 The mixed solution was used as the bottom liquid, and the deposition was started, the deposition voltage was kept at 1.0V, and the deposition time was 10min. After the deposition was completed, the graphite paper sheet was taken out, washed with distilled water until the pH reached 7, and then dried in a vacuum oven at 80 °C for 4 h.
[0041] like Figure 4 As shown, a layer of polyaniline (PANI) is profilically grown on the turned-up graphene surface, and graphene and polyaniline are tightly combined to form a graphene-polyaniline composite material.
[0042] like Figure 5 As shown, the scan rates are 100, 50, 20, and 10 mV/s respectively, and the mass specific capacitance of the graphene-polyaniline electrode material based on polyaniline (PANI) is calculated to be 228 F/g.

Example Embodiment

[0043] Example 3
[0044] Cut the graphite paper sheet into a 2×4cm rectangle with scissors, and the edges of the cut graphite paper sheet should be neat. Use a red carbon pen to draw a straight line 2cm away from one end of the graphite paper on one side of the graphite paper to make it a 2×2cm square as the electrolysis site. Add 30mL of electrolyte solution into a round dry and clean glass dish with a specification of 50×30mm. The electrolyte solution is hydrochloric acid with a pH value of 1.0. The electrolysis device is a DC power supply. Take two cut graphite paper sheets and connect them to the power supply For the positive and negative electrodes, the ends (2×2cm) of the two pieces of graphite paper closest to the straight line are completely submerged below the liquid level of the electrolyte, the straight line is level with the liquid level, and the two electrodes are facing each other in parallel with a distance of 5 cm. When starting electrolysis, slowly adjust the voltage to 5.0V (the field strength is 100V/m), and the electrolysis time is 50min, then take out the graphite paper sheet of the anode, and rinse the electrolysis part with distilled water until the pH is 7. The rinsed graphite paper sheets were dried in a vacuum oven at 80°C for 30 min.
[0045] With the saturated Ag/AgCl electrode as the reference electrode, the platinum sheet as the counter electrode, and the above-mentioned dried graphite paper sheet as the working electrode, add 50 mL of aniline with a concentration of 0.05 mol/L and a concentration of 0.5 mol into a 150 mL beaker. /L H 2 SO 4 The mixed solution was used as the bottom liquid, and the deposition was started, the deposition voltage was constant at 0.6V, and the deposition time was 30min. After the deposition was completed, the graphite paper sheet was taken out, rinsed with distilled water, and dried in a vacuum oven at 80°C for 4 h.
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