Application of Nutshell Activated Carbon in Electric Double Layer Capacitors

Nutshell activated carbon is also the most widely used electrode material for electric double layer capacitors (EDLC). As early as 1954, nutshell activated carbon was used for EDLC electrodes. powdered carbon bulk It is generally believed that the larger the specific surface area of the shell activated carbon, the higher its specific volume. It is generally believed that the electrode material with a larger specific surface area is used to obtain a high specific volume area.

Since the EDLC mainly relies on the electrolyte to enter the pores of the activated carbon in the nut shell to form an electric double layer to store charges, it is generally believed that the 2nm pores in the carbon material in the aqueous solution are more advantageous to form the electric double layer. Layer composition; for non-aqueous electrolyte, the pore size is 5nm.

It is difficult for the electrolyte solution to enter and infiltrate these micropores because the pore size is too small. Therefore, the outer surface area corresponding to these micropores becomes an invalid outer surface area. Therefore, it is necessary to select a good range value for the pore size and specific surface of the activated carbon from the husk to increase the content of mesopores. The effective outer surface area of the components is applied to increase the electrode.的比容.

Since the 1970s, people have stopped a lot of work in order to obtain high specific capacity AC electrode materials. At present, the specific capacity of AC electrodes activated with potassium hydroxide solution can reach 400F/g. activated carbon pellets for sale Zhang Baohong and others use vacuum impregnation and alkaline The disposal method stopped the modification of the AC electrode, and the result showed that the specific capacity of the modified AC electrode increased by 26.80%. The capacitor was cycled 1000 words, and the capacitance remained above 91%, and the leakage current of the capacitor was small. This is the large specific volume that can be reached by current nutshell activated carbon materials.