A kind of porous carbon electrode material supporting metal oxide and preparation method thereof

Abstract

The invention provides a porous carbon electrode material loaded with metal oxides and a preparation method thereof, comprising the following steps: A. placing activated carbon powder in a hydrochloric acid solution with a volume concentration of 8-10%, and heating and refluxing for 4-6h, and pumping The precipitate obtained by filtering is dried; B, the material obtained in step A is stirred and washed with deionized water, and the precipitate obtained by suction filtration is dried to obtain an activated carbon material; C, the activated carbon material obtained in step B is placed in a container In the method, metal ion modification is carried out by vacuum vibration equal volume impregnation method, and 0.03~0.1mol / LFeCl is mixed with a burette 3 The aqueous solution was dripped in a vacuum state and kept shaking to obtain a paste state mixture, then ultrasonicated at 25-60°C for 1-3h, then dried under vacuum at 110-120°C for 5-8h, and finally in the tube The temperature was raised to 400-450°C for 2-4 hours in a type furnace, and the sintering atmosphere was an inert atmosphere to obtain the target material. The electrode prepared by the invention improves the energy storage of the supercapacitor without changing the surface structure of the original activated carbon basically.

Description

technical field [0001] The invention relates to the field of preparation of supercapacitor electrode materials, in particular to a metal oxide-supported porous carbon electrode material and a preparation method thereof. Background technique [0002] The energy storage of traditional activated carbon-based supercapacitors is mostly limited by the electric double layer theory. According to the electric double layer theory, the specific capacity of activated carbon material is proportional to its specific surface area, that is, the larger the specific surface area, the larger the specific capacity. When the specific surface area of ​​the activated carbon material used is not high, the specific capacitance it can contribute is extremely limited, so that the energy density of the activated carbon-based supercapacitor is also low. In addition, the surface modification of general activated carbon materials is difficult to achieve uniform loading, and it is easy to produce agglomer...

AI Technical Summary

Problems solved by technology

When the specific surface area of ​​the activated carbon material used is not high, the specific capacitance it can contribute is extremely limited, making the energy density of activated carbon-based supercapacitors low

In addition, the surface modification of general activated carbon materials is difficult to achieve uniform loading, and it is easy to agglomerate, which greatly affects the performance of electrode materials.

Images