Method for preparing porous carbon from scallions and waste

Abstract

The invention relates to a method for preparing porous carbon from a green Chinese onion and a waste, and relates to the technical field of preparation of the porous carbon. The method comprises the following steps: (1) drying and pulverizing the raw material of the green Chinese onion, putting in a heating furnace, introducing a protective gas, heating and carbonizing; (2) pickling a produced obtained in the step (1), then washing to neutral, and drying; (3) mixing and soaking a produced obtained in the step (2) with an activating agent, heating and activating under the protective atmospherein the heating furnace; (4) pickling and drying a product obtained in the step (3), to obtain the green Chinese onion based porous carbon. The green Chinese onion and the waste of the green Chinese onion are taken as the raw materials, the prepared porous carbon is low in ash content and good in wettability, an assembled double-electrode system double-electric-layer supercapacitor has the advantages of high specific capacitance, low equivalent series resistance, high charge-discharge efficiency, and low time constant, and particularly has an excellent high-current charge-discharge capacity andenergy density when charging and discharging at high rate.

Description

technical field

[0001] The invention relates to the technical field of preparation of porous carbon, in particular to a supercapacitor porous carbon electrode material and a preparation method thereof. Background technique

[0002] As a new type of energy storage device between traditional capacitors and rechargeable batteries, supercapacitors have the advantages of high energy density, high power density, long cycle life, fast charge and discharge speed, large temperature window and excellent rate performance. Information technology, electric vehicles, aerospace and defense technology and other fields have extremely important and broad application prospects.

[0003] At present, supercapacitor electrode materials mainly include the following categories: transition metal oxides, conductive polymers, and carbon-based materials. Among the electrode materials for supercapacitors, various carbon materials, such as activated carbon, carbon nanotubes, graphene, and carbon aerogel...

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