Nitrogen and boron co-doped porous carbon material and preparation method and application thereof

Abstract

The invention discloses a nitrogen and boron co-doped porous carbon material. The nitrogen and boron co-doped porous carbon material is prepared by taking glucose, melamine and boric acid as raw materials, preparing a nitrogen and boron precursor after reaction and then performing calcination and activation. The specific surface area of the nitrogen and boron co-doped porous carbon material is (1,027-1,432) m<2> g<-1>, the average pore size distribution is 1.686-3.826 nanometers, and the micropore content accounts for 77-81%. The preparation method comprises the steps of 1) preparing the nitrogen- and boron-containing precursor; 2) activating the nitrogen- and boron-containing precursor; and 3) performing post-processing on the nitrogen- and boron-containing precursor. When the nitrogen and boron co-doped porous carbon material is used as a supercapacitor electrode material, the specific capacitance value is 230-309 F g<-1> when the current density is 0.5A G<-1>. The melamine has a unique and rich macropore framework structure, the microstructure morphology of the material is controlled, porous microstructure morphology in a honeycomb shape similar to cheese and with thick slice structure is obtained, so that the nitrogen and boron co-doped porous carbon material has favorable electrochemical performance. The nitrogen and boron co-doped porous carbon material has wide application prospect in the field of a supercapacitor, a fuel cell and the like.

Description

Technical field [0001] The invention relates to the technical field of supercapacitors, in particular to a porous carbon material co-doped with nitrogen and boron, and a preparation method and application thereof. Background technique [0002] With the increasing depletion of fossil energy and the more serious environmental pollution on which mankind depends, mankind urgently needs a green power source. Supercapacitors are a new type of green energy storage device between secondary batteries and physical capacitors. Supercapacitors have the characteristics of fast charge and discharge time, long cycle life, good temperature characteristics, and high power density. They are used in mobile communications, electric vehicles, aerospace and defense technology and other fields. The electrode materials of supercapacitors mainly include: metal oxides, conductive poly and carbon materials. [0003] Carbon materials have received widespread attention due to their low price, high specific s...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a nitrogen-boron co-doped porous carbon material and its preparation method and its application as an electric double layer capacitor. By modifying the porous carbon material and improving the pore size distribution, a cheese-like honeycomb And it presents an electrode material with a porous microscopic morphology of a thick slice structure, and at the same time solves the current problems of low capacitance storage, high-capacity electrode materials, cumbersome preparation process, and high cost

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