A kind of method and application of preparing nitrogen-doped porous carbon material with coconut shell as raw material

Abstract

The invention discloses a method of preparing a nitrogen-doped porous carbon material with coconut shells as a raw material and an application of the nitrogen-doped porous carbon material. The methodcomprises the steps: with coconut shells as the raw material, screening out filamentous shredded coconut, carbonizing at high temperature to obtain a material A, and carrying out alkali washing and pickling of the material A successively to obtain a material B; dispersing the material B in a mixed solution of potassium hydroxide and potassium bicarbonate, activating for 1 h, then adding a melaminesolution, continuing to stir for 2 h, and next freeze-drying the solution to obtain a material C; and carrying out high temperature carbonization treatment of the material C, pickling, filtering, washing with water, and drying to obtain the nitrogen-doped porous carbon material. The nitrogen-doped porous carbon material prepared from the agricultural and forestry waste coconut shells with rich resources and low cost and as the raw material has large specific surface area and multi-stage porous structure, wherein macropores are advantageous to mass transfer, and micropores and mesopores can provide more active sites to improve catalytic activity; moreover, the carbon material has strong resistance to a methanol solution, has good cycling stability, and has potential application prospects on oxygen reduction catalysts.

Description

technical field [0001] The invention belongs to the field of inorganic nanometer materials and electrochemistry, relates to a nitrogen-doped porous carbon material, in particular to a method and application for preparing a nitrogen-doped porous carbon material from coconut shells. Background technique [0002] Oxygen reduction reaction is an important process in new energy conversion devices such as fuel cells and metal-zinc-air batteries. Because of its slow kinetics and many side reactions, catalysts with excellent performance are required to catalyze it. For a long time, the oxygen reduction reaction in actual devices is catalyzed by platinum, palladium, iridium and other noble metal catalysts. These noble metal catalysts are not only expensive, but also have poor durability and are easily poisoned by substances such as carbon monoxide and methanol, which limits new energy sources such as fuel cells. Commercial development of the device. Therefore, the development of low...

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Problems solved by technology

Although this method obtains doped porous carbon materials with high specific surface area and high nitrogen content, it needs to use strong acid solution of concentrated sulfuric acid, which is not environmentally friendly, and ammonia gas is injected at high temperature, which has low safety.

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