Preparation method and application of Bi / SnO2 difunctional electrocatalyst

CN122082015APending Publication Date: 2026-05-26HEFEI UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HEFEI UNIV OF TECH
Filing Date
2026-02-12
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

Existing catalysts for CO2 reduction to formic acid have problems such as high cost of precious metals and heavy metal pollution, and the oxygen produced by the oxygen evolution reaction at the anode has low value, resulting in high energy consumption and low resource utilization efficiency of the electrolysis system.

Method used

Bi/SnO2 bifunctional electrocatalysts were used to prepare Bi spheres via hydrothermal synthesis and tightly bond them with SnO2. These spheres served as anode and cathode catalysts, simultaneously generating formic acid during the electrocatalytic process, thus replacing the oxygen evolution reaction at the anode.

Benefits of technology

This method achieves efficient and stable formic acid production, improves the overall resource utilization efficiency of the electrolysis system, reduces energy consumption, and enhances the activity and selectivity of the catalyst.

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Abstract

The invention discloses a preparation method and application of a Bi / SnO2 difunctional electrocatalyst, and the preparation method comprises the following steps: providing a reduction environment by using the combined action of polyvinylpyrrolidone and ethylene glycol, reducing sodium bismuthate into spherical elemental Bi with a regular shape by a hydrothermal synthesis method, and then combining the spherical elemental Bi with SnO2 through rapid centrifugation and vacuum heating to obtain the BiSnO2 difunctional electrocatalyst. Thus, the Bi / SnO2 bifunctional catalyst is obtained. The path of hydrothermal synthesis of the bismuth elementary substance is optimized, the two catalyst materials are tightly combined through heating treatment on the basis, reaction active sites are increased, the obtained catalyst is stable in structure, the catalytic performance is obviously improved, formic acid preparation through electro-catalysis can be promoted at the same time on the cathode and the anode, high selectivity and Faraday efficiency are achieved, and the method is suitable for industrial production. And the original morphology is still maintained after long-time working.
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