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Preparation method of novel cobaltous dihydroxycarbonate-nitrogen-doped graphene combined electrode material

A technology of nitrogen-doped graphene and composite electrodes, which is applied in the manufacture of hybrid capacitor electrodes, hybrid/electric double layer capacitors, etc., can solve problems such as difficulty in upgrading and pseudocapacitance bottlenecks, and achieve large effective specific surface area and good pseudocapacitive performance , the effect of good conductivity

Inactive Publication Date: 2015-12-23
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the limitation of the chemical structure of these pseudocapacitive materials, the pseudocapacitance value has also reached a bottleneck, and it is difficult to improve it.

Method used

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  • Preparation method of novel cobaltous dihydroxycarbonate-nitrogen-doped graphene combined electrode material
  • Preparation method of novel cobaltous dihydroxycarbonate-nitrogen-doped graphene combined electrode material
  • Preparation method of novel cobaltous dihydroxycarbonate-nitrogen-doped graphene combined electrode material

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Experimental program
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Effect test

Embodiment 1

[0025] Add 0.2g of graphite oxide powder into 100ml of deionized water, and sonicate for 1.0h at a power of 100W to obtain a graphene oxide suspension with a concentration of 2.0mg / ml; add 7.0mg of cobalt acetate under continuous stirring conditions to obtain Co 2+ The concentration of the solution is 8mM; then add ammonia water dropwise under the condition of 80°C water bath, adjust the pH of the mixed solution to 9.5, and then stir for 40min; transfer the 35ml water bath reaction solution into a 50ml reaction kettle, and react at 180°C for 12h; Cool naturally after the reaction, centrifuge the obtained product, wash repeatedly with absolute ethanol and deionized water for 3-5 times, and freeze-dry the precipitate for 12 hours to obtain the final product.

[0026] figure 1 (a) is the SEM picture of the product obtained in Example 1, as can be seen from the figure cobalt basic carbonate nanowires are evenly distributed in the nitrogen-doped graphene framework. figure 1 (b) Th...

Embodiment 2

[0031] Change Co 2+ The concentration is 2ml, and other conditions are identical with embodiment 1.

Embodiment 3

[0033] Change Co 2+ The concentration is 12ml, and other conditions are identical with embodiment 1.

[0034] Figure 5 (a)~(d) are in different Co 2+ The SEM and TEM images of the complex formed under concentration-response conditions. It can be seen from the figure that with the Co 2+ As the content increases, the number of basic cobalt carbonate nanowires increases, the length becomes longer, and the stacking becomes serious. When the reactant Co 2+ When the concentration is very high, the generated nanowires will cover the graphene, thereby reducing the capacitance performance of the composite, such as Figure 4 (b) (d) shown.

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Abstract

The invention discloses a preparation method of a novel cobaltous dihydroxycarbonate-nitrogen-doped graphene combined electrode material. The preparation method is characterized in that on the basis of simple one-step hydro-thermal reaction, cobaltous dihydroxycarbonate nano wires are uniformly distributed at a two-dimensional nitrogen-doped graphene skeleton uniformly in a product. According to the invention, the graphene with high specific surface area, high conductivity, and high flexibility is combined with the faradaic-pseudocapacitance cobaltous dihydroxycarbonate nanometer material, so that defects of low capacitance of the dual-electrode-layer material and poor conductivity of the faradaic pseudocapacitance can be overcome. Especially, the shape of the combined electrode material can be regulated by the reactant concentration, thereby realizing performance optimization. The specific capacitance of the combined material under the electric current density of 1.0Ag<-1> can reach 1690Fg<-1>; and the capacitance retention rate can reach 94.2% after the ten thousand of times of charging and discharging circulation. The preparation method has advantages of simple operation, low cost, and easy control.

Description

technical field [0001] The present invention relates to a preparation method of a novel pseudocapacitive supercapacitor electrode material, especially a preparation method of a novel basic cobalt carbonate-nitrogen-doped graphene composite electrode material, which combines rod-shaped nano basic cobalt carbonate and nitrogen-doped graphite The advantages of alkenes are combined. The preparation method is simple, low in cost and easy for industrialization. Background technique [0002] As a new type of electrochemical energy storage unit, supercapacitor has the advantages of large capacity, high power density, maintenance-free, no pollution to the environment, long cycle life, and wide temperature range. It has been used in backup power systems, portable electronic devices and electric There are a wide range of applications in the automotive field. In recent years, the basic research on supercapacitor energy storage technology at home and abroad has shown explosive growth, ...

Claims

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Application Information

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IPC IPC(8): H01G11/86H01G11/24H01G11/30H01G11/36
Inventor 唐少春谢浩孟祥康
Owner NANJING UNIV
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