Method for preparing transition metal complex heteroatom-doped porous carbon materials by impregnating recrystallized carbonized biomass

Abstract

The invention provides a method for preparing a transition metal composite hetero atom doped porous carbon material through dipping, recrystallizing and carbonizing biomasses. The method comprises the following steps: immersing the biomasses in an aqueous solution of metal salt, and carrying out refrigeration vacuum drying on the immersed biomasses to recrystalize the metal salt in apertures of the biomasses in order to obtain a product A; and 2, placing the product A in a tubular furnace, and carrying out high temperature calcining to carbonize the biomasses at a high temperature and realize a metal salt decomposition reaction in order to obtain the transition metal composite hetero atom doped porous carbon material. The non-noble metal modified biomass carbon material is prepared from the biomasses through using the porous structure of the biomasses. Compared with routine high temperature carbonization, dipping recrystallization carbonization can synchronously realize activation and perforation, so the porous carbon prepared in the invention has a large specific surface area and good conductivity, thereby the porous carbon material still has strong energy storage and release ability under a high current density.

Description

technical field [0001] The invention relates to a preparation method of a transition metal compound-heteroatom doped porous carbon material. Background technique [0002] In recent years, carbon materials, as a cheap and stable material, have attracted close attention and have been widely used in gas separation, water purification, catalytic chromatography, energy storage, and photocatalysis. However, the electrical properties of original carbon materials are relatively weak. So far, the capacitance of traditional activated carbon materials is basically 100-200F·g -1 . due to sp 2 Hybrid carbon materials are rich in π electrons that can move freely on the surface of the material. The incorporation of heteroatoms can change the electronegativity of the connected carbon atoms, which is beneficial to improve its electrical properties. In order to improve the electrochemical performance of doped carbon materials, by changing the choice of precursors, different heteroatoms are...

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Problems solved by technology

At present, the synthesis methods for preparing heteroatom-doped carbon materials are: heat treatment method, vapor deposition method, hydrothermal method, arc discharge, plasma method, etc. The main disadvantages of these methods are high requirements for equipment and harsh reaction conditions, which lead to The cost of the synthesized materials is high, which is not conducive to industrial production, let alone the commercialization of products

[0003] In order to further improve the capacitance of carbon materials, transition metal oxides such as (Co 3 o 4 , MnO 2 , NiO, Fe 3 o 4 etc.) Due to its high specific capacitance value, a large number of redox reactions can occur, thereby recombining with carbon materials, see (Carbon, 2007, 45(7): 2365-2373), however due to the transition metal oxide The electrical conductivity is poor, so the electrochemical performance of the prepared composite still needs to be improved

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