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A kind of preparation method of zinc oxide/graphene supercapacitor composite electrode material

A technology of supercapacitors and composite electrodes, which is applied in the manufacture of hybrid capacitor electrodes and hybrid/electric double-layer capacitors, can solve the problems of large internal resistance of transition metal oxides, limited application of supercapacitors, poor cycle stability, etc., and saves preparation. Cost, good rate capability and cycle stability, good effect of stability and conductivity

Active Publication Date: 2018-07-03
HAINAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Generally speaking, the capacitance of transition metal oxides is greater than that of carbon materials, but the internal resistance of transition metal oxides is large, the volume changes during charging and discharging, and the cycle stability is poor, which limits its application in the field of supercapacitors. Applications

Method used

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  • A kind of preparation method of zinc oxide/graphene supercapacitor composite electrode material
  • A kind of preparation method of zinc oxide/graphene supercapacitor composite electrode material
  • A kind of preparation method of zinc oxide/graphene supercapacitor composite electrode material

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Experimental program
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Effect test

Embodiment 1

[0032] Accurately weigh 1.0 g of n-hexylpyridinium hexafluorophosphate and 2.0 g of carbon powder, grind them evenly with an agate mortar to obtain a black paste solid, and then insert the above solid into a glass electrode with a length of 6 cm and an inner diameter of 4 mm Compacted in the tube to obtain the base electrode (CILE), and the surface of the CILE was polished to a mirror surface on a clean weighing paper before use.

Embodiment 2

[0034] Accurately weigh 10.0 mg of graphene oxide and 106.4 mg of lithium perchlorate, dissolve and distill the volume to 10.0 ml with double distilled water, and after ultrasonic dispersion is uniform, nitrogen gas is introduced to remove the oxygen in the solution. CILE was used as the working electrode, the platinum sheet was used as the auxiliary electrode, and the saturated calomel electrode was used as the reference electrode. Graphene was prepared on the surface of CILE by the constant potential deposition method, and the parameters were set as: deposition potential -1.3 V (vs. SCE), time 300 s . At this time, graphene rich in wrinkles can be obtained on the surface of CILE. After washing with distilled water, a graphene-modified electrode (GR / CILE) is obtained. After vacuum drying, the surface morphology is shown in Fig. figure 1 b.

Embodiment 3

[0036] Accurately configure 50 mL of 0.005 mol / L zinc nitrate solution as the electrolyte, CILE and GR / CILE as the working electrode, platinum as the auxiliary electrode, and a saturated calomel electrode as the reference electrode. Nano-zinc oxide materials were obtained on the surface of CILE and GR / CILE, and the deposition conditions were: deposition potential -1.0 V (vs. The surface of GR / CILE can uniformly deposit nano-zinc oxide material, see figure 1 C and figure 1 E, capacitance performance test see figure 2 , 4 and 5.

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Abstract

The invention discloses a preparing method for a zinc oxide / graphene super-capacitor composite electrode material. The zinc oxide / graphene nanometer composite material is prepared on the surface of a matrix electrode with the electrochemical method, then the morphology is characterized, it is discovered that nanometer zinc oxide is evenly distributed on the surface of graphene with rich folds, and the three-dimensional structure is shown. The zinc oxide / graphene nanometer composite material is an electrode material, the electrode material is subjected to a capacitive performance test with the electrochemical method, it is discovered that the specific capacitance of the electrode material is 46.31 mF / cm<2> when the current density is 1.0 mA / cm<2>, the retention rate of the specific capacitance is 93% when circulation charging and discharging are carried out for 100 times under the large current density, it is shown that the zinc oxide / graphene nanometer composite material has the good cycling stability, and the zinc oxide / graphene nanometer composite material is suitable for the electrode material of a super capacitor.

Description

technical field [0001] The invention relates to a method for preparing an electrode material of a supercapacitor and testing the capacitance performance. Background technique [0002] Supercapacitors have the advantages of high power density, fast charging and discharging, and long cycle life, and can be used as energy storage and conversion devices. According to the working principle, supercapacitors can be divided into electric double layer supercapacitors and pseudocapacitor supercapacitors. Electric double layer supercapacitors are constructed based on Helmholtz's electric double layer theory, which has a tighter charge layer than ordinary capacitors and can provide higher capacitance. Pseudocapacitive supercapacitors are generally electroactive materials with a large specific surface area, and a chemical reaction of gaining and losing electrons can occur in the electrolyte, thereby realizing the function of storing and releasing charges. [0003] Electrode material is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/46H01G11/86H01G11/32
CPCY02E60/13
Inventor 孙伟王文成牛学良李小宝文作瑞闫丽君陈玮
Owner HAINAN NORMAL UNIV