A potassium-doped graphite-phase carbon nitride / tungsten trioxide Z-type heterojunction photocatalyst, a preparation method and application thereof

By constructing a Z-type heterojunction with potassium-doped graphitic carbon nitride and tungsten trioxide, the problem of rapid recombination of photogenerated electrons and holes was solved, improving photocatalytic performance and achieving efficient separation of photogenerated carriers and redox capabilities, making it suitable for hydrogen evolution and complete water splitting.

CN118002181BActive Publication Date: 2026-07-24NORTHWESTERN POLYTECHNICAL UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
NORTHWESTERN POLYTECHNICAL UNIV
Filing Date
2024-02-06
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

Existing graphitic carbon nitride photocatalysts suffer from the problem of rapid recombination of photogenerated electrons and holes, resulting in poor photocatalytic performance. Furthermore, traditional heterojunctions sacrifice redox potential when improving the separation rate of photogenerated carriers, and cannot simultaneously retain strong redox capabilities.

Method used

By constructing a Z-type heterojunction with potassium-doped graphitic carbon nitride and tungsten trioxide, the photogenerated carrier generation capability and charge transport performance are improved, a built-in electric field is formed to reduce recombination rate, and redox capability is retained.

Benefits of technology

It improves the separation rate of photogenerated carriers and photocurrent response, enhances the redox capability of the photocatalyst, and achieves efficient hydrogen evolution and complete water splitting performance under visible light.

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Abstract

The application discloses a potassium-doped graphite-phase carbon nitride / tungsten trioxide Z-type heterojunction photocatalyst and a preparation method and application thereof, and relates to the technical field of photocatalytic functional materials. The method comprises the following steps: mixing a graphite-phase carbon nitride precursor and a potassium source after grinding, so as to obtain a block product; grinding the block product into a powder, so as to obtain a K-CN product; and mixing the K-CN product and tungsten trioxide after grinding, so as to obtain the potassium-doped graphite-phase carbon nitride / tungsten trioxide Z-type heterojunction photocatalyst. The K-CN / WO3 Z-type heterojunction photocatalyst is synthesized through a calcination method, the K-CN / WO3 Z-type heterojunction photocatalyst not only retains the strong reduction capacity of K-CN and the strong oxidation capacity of WO3, but also has a strong photocurrent response, and the charge transport performance of the composite material is improved, so that the photo-generated carrier generation capacity of the material is stronger.
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