Porous graphene, preparation method and application thereof in preparation of biocl nanosheet electrocatalyst

By introducing porous graphene support into the BiOCl catalyst, the problems of low electron transport efficiency and poor stability of BiOCl catalyst in the electrochemical reduction of carbon dioxide were solved, and the effect of efficient and stable reduction of carbon dioxide to formic acid was achieved.

CN118373417BActive Publication Date: 2026-07-03XIHUA UNIV
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Patent Information

Application Number
CN202410435231.9
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-04-11
Publication Date
2026-07-03
Estimated Expiration
2044-04-11

AI Technical Summary

Technical Problem

Existing BiOCl catalysts suffer from low electron transport efficiency, scarce surface active sites, small specific surface area, and poor catalytic and structural stability during the electrochemical reduction of carbon dioxide, which limits their catalytic performance and lifespan.

Method used

Using porous graphene as a support and combining it with the preparation method of BiOCl nanosheets, a uniformly loaded BiOCl nanosheet electrocatalyst is formed through chemical vapor deposition and hydrothermal reaction. The high specific surface area and conductivity of porous graphene are utilized to improve the exposure of active sites and catalytic stability.

Benefits of technology

The catalyst achieves high Faraday efficiency and high selectivity in reducing carbon dioxide to formic acid. The formic acid Faraday efficiency exceeds 90% in the potential range of -0.683 to -0.971 V, exhibiting excellent electrocatalytic performance and good structural stability.

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Abstract

This invention belongs to the field of electrocatalysis technology, disclosing a porous graphene, its preparation method, and its application in the preparation of BiOCl nanosheet electrocatalysts. The preparation method of the BiOCl nanosheet electrocatalyst includes the following steps: adding a Bi metal-soluble salt and porous graphene sequentially to ethylene glycol, mixing them uniformly with magnetic stirring, and then placing them in a reaction vessel for hydrothermal reaction. After centrifuging and drying the resulting reactants, a catalyst precursor is obtained. Finally, the precursor is placed in a tube furnace and calcined under a protective atmosphere to obtain a BiOCl nanosheet electrocatalyst with porous graphene as the support. The electrocatalyst synthesized by this invention allows BiOCl nanosheets to be uniformly loaded on a porous graphene substrate, exhibiting structural stability, small size, large specific surface area, and providing active sites. When applied to the electrocatalytic reduction of carbon dioxide, it demonstrates excellent performance in the electrocatalytic reduction of CO2 to formic acid.
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