Cobalt nitride embedded porous nitrogen-doped graphene material and preparation method, application and process

The large consumption of traditional fossil fuels has led to serious climate and environmental problems, which has aroused people's attention to the development of clean and efficient electrochemical energy conversion and storage technologies, such as fuel cells, metal-air batteries, and water electrolysis devices. The performance of these energy storage and conversion devices is determined by several basic electrochemical reactions. For example, rechargeable zinc-air batteries are receiving more and more attention due to their low cost, environmental friendliness and high theoretical energy density. Oxygen evolution reaction (oer) and oxygen reduction reaction (orr) are two key half-reactions that determine the final performance of the zinc-air battery. In addition, electrolysis of water mainly includes hydrogen evolution reaction (her) and oxygen evolution reaction (oer), which is a very promising method for obtaining clean hydrogen energy. Due to the multi-electron transfer process and slow kinetics of orr, oer, and her, high-efficiency electrocatalysts are needed to reduce the reaction overpotential and improve the conversion efficiency. So far, single-function oer or orr electrocatalysts have made important progress. For example, platinum (pt) and its alloy-based catalysts are effective orr/her catalysts, while ruthenium (ru)/iridium (ir) and their oxides represent the most advanced catalyst materials for oer.

A cobalt nitride embedded porous nitrogen-doped graphene material, which is characterized in that it comprises nitrogen-doped graphene and co5.47n nanoparticles. The surface of the nitrogen-doped graphene has a hole-like structure with a worm-like trace. The .47n nanoparticles are embedded at the end of the hole-like structure of the worm-like trace.

Add cobalt acetate and tannic acid to the dispersion of graphene oxide in sequence to obtain a suspension. After separating the solid materials in the suspension, heat it to no less than 600°C under a mixed atmosphere of nitrogen and ammonia. untie.

Cobalt acetate was added to the graphene oxide dispersion to disperse evenly, then tannic acid was added and mixed uniformly to obtain a suspension. After the solid materials in the suspension were separated, washed and dried, and then heated to dryness under a mixed atmosphere of nitrogen and ammonia. Pyrolysis is performed below 600°C.

A cobalt nitride embedded porous nitrogen-doped graphene material and preparation method and application thereof, which include nitrogen-doped graphene and Co5.47N nanoparticles, and the surface of the nitrogen-doped graphene has a hole-like structure with a worm-like trace , Co5.47N nanoparticles are embedded in the end of the hole-like structure of the worm-like trace. The preparation method is as follows: sequentially add cobalt acetate and tannic acid to the dispersion of graphene oxide and mix uniformly to obtain a suspension; after separating the solid materials in the suspension, heating it to a minimum under a mixed atmosphere of nitrogen and ammonia Pyrolysis is carried out at 600°C. The materials provided in the present disclosure exhibit effective multifunctional catalytic activities for ORR, HER and OER in alkaline solutions.

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