Nitrogen-sulfur co-doping carbon material with electro-catalysis oxygen reduction activity on acid and alkali conditions and preparation method

Abstract

The invention discloses a nitrogen-sulfur co-doping carbon material with electro-catalysis oxygen reduction activity on acid and alkali conditions and a preparation method, and belongs to the technical field of novel material application. The method comprises the technological processes that clean animal hair is put into a reaction kettle liner, analytic pure ammonia water is added, a hydrothermal degradation reaction is performed, hydrothermal degradation is performed on the obtained solution, drying is performed and then grinding is performed to obtain biological organic solid powder; the solid powder is dissolved into methyl alcohol, then zinc nitrate is added, and the obtained suspension is magnetically stirred evenly and then poured into the reaction kettle liner; after the solvothermal process is finished, centrifugal separation is performed to obtain a metal organic coordination polymer which is used as a precursor, and heat treatment is performed on the precursor at the inert atmosphere; an obtained sample is cleaned with diluted hydrochloric acid, and suction filtration and drying are performed to obtain the nitrogen-sulfur co-doping carbon material. The material has the large specific surface area and the abundant hole structure. The nitrogen-sulfur co-doping carbon material obtained through the method has the excellent performance on fuel cell cathode oxygen reduction catalysis on the acid and alkali conditions.

Description

technical field [0001] The invention relates to a nitrogen-sulfur co-doped carbon material with electrocatalytic oxygen reduction activity under acid and alkali conditions and a preparation method thereof, belonging to the field of new materials. Background technique [0002] Doped carbon materials have the advantages of good stability, methanol resistance and low price. They are currently very popular materials in the field of fuel cell cathode materials, but their electrocatalytic performance needs to be improved, especially under acidic conditions. Studies have shown that the synergistic effect between heteroelements helps to improve the oxygen reduction performance of materials. Many of the precursors currently used for synthesizing co-doping are toxic organic substances, and the preparation methods of carbon materials are usually based on relatively harsh conditions, such as: high-voltage arc discharge, laser ablation, chemical vapor deposition, catalytic heat treatment...

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Problems solved by technology

Although the specific surface area of ​​the material obtained by this method is relatively large, the oxygen reduction performance of the fuel cell cathode is not ideal, and only the electrocatalytic performance of oxygen reduction under alkaline conditions has been reported. Due to the low performance under acidic conditions, it is not suitable for current research. Proton membrane fuel cells need acidic conditions, so it is very important to continue to improve the preparation method to prepare nitrogen-sulfur co-doped carbon materials that have catalytic oxygen reduction activity under acidic and alkaline conditions.

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