Preparation method and application of bismuth nanocrystal / nitrogen-rich graphite carbon electrocatalyst

By preparing bismuth nanocrystals/nitrogen-rich graphite carbon electrocatalysts, the problem of particle instability in bismuth-based catalysts during CO2 electroreduction was solved, achieving efficient and stable CO2 electroreduction performance and low-cost catalytic effect.

CN119663359BActive Publication Date: 2026-01-06CHONGQING INST OF GEOLOGY & MINERAL RESOURCES +2
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Patent Information

Application Number
CN202411892352.2
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-12-20
Publication Date
2026-01-06
Estimated Expiration
2044-12-20

AI Technical Summary

Technical Problem

Existing bismuth-based catalysts are prone to particle size growth and active site loss during CO2 electroreduction, resulting in unstable catalytic performance. Furthermore, the preparation process is complex, making it difficult to control the identification of active sites and the regulation of performance.

Method used

A chelated ligand of urea and ammonium chloride was used to prepare bismuth nanocrystals/nitrogen-rich graphite carbon electrocatalysts by freeze-drying and stepwise calcination, forming a sandwich porous structure to ensure the dispersibility and stability of bismuth nanoparticles and avoid agglomeration.

Benefits of technology

It improves the electrocatalytic reduction performance and stability of the catalyst, enhances the dispersibility of active sites, significantly improves the selectivity and efficiency of CO2 electroreduction, reduces production costs, and conforms to the concept of green chemistry.

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Abstract

The application relates to the technical field of electrocatalysis, in particular to a preparation method and application of a bismuth nanocrystal / nitrogen-rich graphite carbon electrocatalyst, which comprises the following steps: S1, adding urea and ammonium chloride into water, stirring, freeze-drying, grinding, and obtaining a chelating ligand; S2, adding bismuth citrate into the chelating ligand, carrying out a solid-phase reaction, and obtaining a precursor; and S3, calcining the precursor under nitrogen protection, and obtaining the bismuth nanocrystal / nitrogen-rich graphite carbon electrocatalyst. The problems that reduction and reconstruction reactions are prone to occur in the process of catalyzing CO2 electrocatalytic reduction, and the difficulty in increasing the recognition and performance regulation of active sites can be solved.
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