Passion fruit shell based porous carbon material as well as preparation method and application thereof

Abstract

The invention discloses a passion fruit shell based porous carbon material. The passion fruit shell based porous carbon material is prepared by carrying out low-temperature carbonization treatment on passion fruit shells, mixing the passion fruit shells with a nitrogen-containing compound and calcining and activating a mixture by adopting an alkaline inorganic matter; a specific surface area range is 1500m<2>g<-1> to 2603m<2>g<-1>, the pore diameter distribution is uniform and pores are distributed in a range of 1.80nm to 2.40nm. A preparation method of the passion fruit shell based porous carbon material comprises the following steps: step 1) carrying out low-temperature carbonization on the passion fruit shells; step 2) activating a passion fruit shell based carbon material; step 3) carrying out post-treatment on the passion fruit shell based carbon material. The passion fruit shell based porous carbon material is used as an electrode material of a supercapacitor; when the current density is 0.5Ag<-1>, a specific capacitance value range is 261Fg<-1> to 347Fg<-1>. According to the passion fruit shell based porous carbon material, the passion fruit shells are used as a carbon source so that the comprehensive utilization rate of passion fruit shell resources is improved and a product with high-addition value is obtained. The material has good supercapacitor performance, such as good cycling stability and rate performance, and has a wide application prospect in the fields of energy storage and conversion.

Description

technical field [0001] The invention relates to the technical field of porous materials, in particular to a passion fruit shell-based multistructured carbon material and a preparation method and application thereof. Background technique [0002] As a new type of high-efficiency energy storage device, supercapacitors have a series of advantages such as high power density, long cycle life, high charge and discharge efficiency, maintenance-free, energy saving and environmental protection, etc. It has been applied in many fields. At present, there are three main categories of electrode materials used in supercapacitors: carbon-based materials, metal oxides, and conductive polymers. Porous carbon materials in carbon-based materials are currently the most widely used type of electrode materials. Due to their good physical and chemical properties, such as large specific surface area, controllable pore structure, stable chemical properties, high thermal conductivity, high electrica...

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Problems solved by technology

However, the specific surface area of ​​the prepared porous carbon material is low, and the specific capacity decreases rapidly at high current density, at 5 A g −1 Specific capacity at current density is only 240 F g −1

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