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Preparation method of layered cobalt-zinc double hydroxide-graphene compound supercapacitor electrode

A double hydroxide and supercapacitor technology, which is applied in the manufacture of hybrid capacitor electrodes and hybrid/electric double-layer capacitors, can solve the problems of low specific surface area and ion diffusion rate, high theoretical specific capacitance, and low cycle performance. Effects of high specific surface area, efficient ion diffusion channels, and high rate capability

Inactive Publication Date: 2016-12-07
HENAN NORMAL UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Graphene is a new type of carbon material with a large specific surface area and excellent electrical conductivity. It is an ideal supercapacitor electrode material, but the π-π stacking effect between graphene sheets makes it very easy to agglomerate, resulting in Low specific surface area and ion diffusion rate, the actual specific volume is significantly different from the theoretical value
Hydrotalcite-like layered cobalt-zinc double hydroxides have high theoretical specific capacitance and low element cost, and are a promising class of electrode materials, but have low cycle performance

Method used

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  • Preparation method of layered cobalt-zinc double hydroxide-graphene compound supercapacitor electrode
  • Preparation method of layered cobalt-zinc double hydroxide-graphene compound supercapacitor electrode

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Effect test

Embodiment 1

[0014] 4mg graphene oxide and 4mg sodium dodecylbenzene sulfonate are ultrasonically dispersed in 40mL molar concentration of 2mol / L aqueous urea solution to form a graphene oxide suspension, then add 1 × 10 to the graphene oxide suspension respectively -3 mol of cobalt nitrate hexahydrate and 3×10 -3 mol of zinc acetate dihydrate, stirred to form a uniform precursor solution, and then transferred the precursor solution to the hydrothermal reaction kettle, and at the same time, the foamed nickel current collector with a size of 1cm×1cm×0.1cm was immersed in the hydrothermal reaction kettle In the precursor solution, the hydrothermal reaction was carried out at 120°C for 5 hours, and the hydrotalcite-like layered cobalt-zinc double hydroxide-graphene composite was deposited on the surface of the nickel foam current collector, and the composite active electrode was obtained after ultrasonic washing and drying.

[0015] Two sheets of the prepared composite active electrodes were ...

Embodiment 2

[0017] 40mg graphene oxide and 40mg polyvinylpyrrolidone are ultrasonically dispersed in 40mL molar concentration of 2mol / L aqueous urea solution to form a graphene oxide suspension, then add 1 × 10 -3 mol of cobalt nitrate hexahydrate and 3×10 -3 mol of zinc acetate dihydrate, stirred to form a uniform precursor solution, and then transferred the precursor solution to the hydrothermal reaction kettle, and at the same time, the foamed nickel current collector with a size of 1cm×1cm×0.1cm was immersed in the hydrothermal reaction kettle In the precursor solution, the hydrothermal reaction was carried out at 150°C for 8 hours, and a hydrotalcite-like layered cobalt-zinc double hydroxide-graphene composite was deposited on the surface of the nickel foam current collector, and the composite active electrode was obtained after ultrasonic washing and drying.

[0018] Two sheets of the prepared composite active electrodes were separated by a hydrophilic glass fiber separator, immerse...

Embodiment 3

[0020] 40mg graphene oxide and 200mg P123 ultrasonic dispersion in 40mL molar concentration is the urea aqueous solution of 2mol / L to form graphene oxide suspension, add 2 * 10 respectively in this graphene oxide suspension -2 mol of cobalt nitrate hexahydrate and 2×10 -2 mol of zinc acetate dihydrate, stirred to form a uniform precursor solution, and then transferred the precursor solution to the hydrothermal reaction kettle, and at the same time, the foamed nickel current collector with a size of 1cm×1cm×0.1cm was immersed in the hydrothermal reaction kettle In the precursor solution, the hydrothermal reaction was carried out at 180°C for 5 hours, and a hydrotalcite-like layered cobalt-zinc double hydroxide-graphene composite was deposited on the surface of the nickel foam current collector. After ultrasonic washing and drying, the composite active electrode was obtained. The active electrode The complex on the surface presents a sheet-assembled structure (such as figure 1 ...

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Abstract

The invention relates to a preparation method of a layered cobalt-zinc double hydroxide-graphene compound supercapacitor electrode. The preparation method comprises the following steps of firstly, dispersing graphene oxide and a surfactant in an urea aqueous solution with ultrasound to form a graphene oxide suspension liquid; secondly, adding cobalt nitrate hexahydrate and zinc acetate dehydrate to the graphene oxide suspension liquid, and stirring the liquid to form a uniform precursor solution; and finally, transferring the precursor solution to a hydrothermal reaction kettle, simultaneously placing a foamed nickel current collector in the precursor solution in the hydrothermal reaction kettle for hydrothermal reaction at 120-180 DEG C, depositing a hydrotalcite layered cobalt-zinc hydroxide-graphene compound on the surface of the foamed nickel current collector, and drying the foamed nickel current collector after ultrasonic washing to form the compound active electrode. The preparation method is simple, is easy to control and is low in cost, and the prepared compound active electrode is endowed with relatively high special capacitance and rate performance.

Description

technical field [0001] The invention belongs to the technical field of preparation of supercapacitor electrodes, and in particular relates to a method for preparing layered cobalt-zinc double hydroxide-graphene composite supercapacitor electrodes. Background technique [0002] With the increasing demand for human energy and the increasing pressure on the environment, efficient, clean and recyclable new energy has become a hot spot in current research and development. Supercapacitor is a new type of electrochemical energy storage device, which has the remarkable characteristics of high power density, short charge and discharge time, and long cycle life. Its research and development have attracted widespread attention from the society. The energy storage of supercapacitors is mainly through ion adsorption on the surface of porous electrode materials and reversible redox reactions on the surface of active materials. Therefore, electrode materials are the core part of supercapac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/30H01G11/86
CPCY02E60/13H01G11/86H01G11/30
Inventor 高志永张玲翠常玖利武大鹏徐芳蒋凯
Owner HENAN NORMAL UNIV
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