A catalyst for electrochemical reduction of CO2 based on boron-nitrogen co-doped nano-diamond, preparation method and application thereof

Abstract

The invention belongs to the field of electrochemistry, and relates to a catalyst for electrochemical reduction of CO2 based on boron-nitrogen co-doped nano-diamond, in which the dopant nitrogen content is 0-10 at%, the boron content is 0-5 at%, Size 10 ~ 500nm. The boron-nitrogen co-doped nano-diamond of the present invention is prepared by hot-wire chemical vapor deposition method under the conditions of tungsten wire temperature 1900-2200°C and pressure 200-2000Pa for 10-20h, wherein the volume fractions of N2 and CH4 are respectively 2.5-25 %, 0.5-20%. The electrochemical reduction CO2 catalyst has the advantages of high electrocatalytic activity, high C2 product selectivity and good material stability for the electrochemical reduction CO2 reaction. It is a non-metallic electrocatalytic material with excellent performance and low price, which can be applied to CO2 The field of resource 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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