Electrochemical reduction CO2 catalyst based on boron and nitrogen co-doped nano-diamond and preparation method and application of catalyst

Abstract

The invention belongs to the field of electrochemistry, and relates to an electrochemical reduction CO2 catalyst based on boron and nitrogen co-doped nano-diamond. A doping agent in the nano-diamond has the nitrogen content of 0-10 at%, the boron content of 0-5 at% and the granularity of 10-500 nm. The nano-diamond is prepared by depositing for 10-20 hours through a hot wire chemical gas-phase depositing method at the tungsten filament temperature of 1900-2200 DEG C and the pressure of 200-2000 Pa, wherein the volume percentage of N2 is 2.5-25%, and the volume percentage of CH4 is 0.5-20%. The catalyst has the advantages of being high in electro-catalysis activity, C2 product selectivity and material stability and the like for electrochemical reduction CO2 reaction, is a nonmetallic electro-catalysis material excellent in performance and low in price, and can be applied to the field of CO2 resourceful utilization.

Description

technical field [0001] The invention belongs to CO 2 In the field of resource utilization, it involves an electrochemical reduction of CO based on boron-nitrogen co-doped nano-diamonds 2 catalyst. Background technique [0002] Electrochemical reduction is CO 2 An important direction of resource utilization technology, which can reduce CO 2 Conversion to CO, formic acid, formaldehyde, methanol, CH 4 , acetic acid, ethylene and other substances are slowing down CO 2 The resulting greenhouse effect produces chemicals with economic value at the same time, which has both environmental and economic benefits, and has received extensive attention in recent years. Electrochemical reduction of CO 2 Low energy utilization, poor product selectivity, and easy catalyst deactivation are the main factors that limit its application, and the key to solving this problem is to develop electrode materials with specific selectivity and high catalytic activity. [0003] The most widely stud...

AI Technical Summary

Problems solved by technology

However, metals and their complexes electrochemically reduce CO 2 It has the following disadvantages: low current efficiency (the impact of hydrogen evolution in electrolyzed water), poor product selectivity, high overpotential and easy deactivation of materials, while precious metals are expensive and scarce materials are also important reasons affecting its application

But currently CO 2 The reduction product is mainly C 1 compound, the CO 2 Converted to C with higher energy density 2 Catalytic materials for the products are still very scarce

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