A g-c3n4 / mn 0.3 Cd 0.7 Z-type heterojunction photocatalyst of s and preparation method and application thereof

By constructing a Z-type heterojunction photocatalyst of g-C3N4/Mn0.3Cd0.7S, the problems of high carrier recombination rate and poor stability of photocatalysts were solved, achieving efficient photocatalytic hydrogen evolution and excellent cycle stability, which is suitable for photocatalytic water splitting to produce hydrogen.

CN122252231APending Publication Date: 2026-06-23NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
Filing Date
2026-03-31
Publication Date
2026-06-23

AI Technical Summary

Technical Problem

Existing graphitic carbon nitride (g-C3N4) and manganese cadmium sulfide (MnxCd1₋xS) photocatalysts suffer from high recombination rates of photogenerated carriers, small specific surface areas, slow electron transfer rates, and poor stability in the field of photocatalytic hydrogen evolution, making it difficult to achieve high efficiency and long-term use.

Method used

A Z-type heterojunction photocatalyst was formed by combining 2D g-C3N4 nanosheets with 1D Mn0.3Cd0.7S solid solution. Mn0.3Cd0.7S was loaded on the surface of g-C3N4 nanosheets to construct a closely contacted heterostructure. The catalyst was prepared by a three-step process.

Benefits of technology

The catalyst achieved directional migration and efficient separation of photogenerated carriers, with a hydrogen evolution rate of 1825.9 μmol·g⁻¹·h⁻¹ under visible light. It exhibited excellent cycle stability and maintained an initial activity of over 92%, demonstrating good potential for large-scale production.

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Abstract

This invention relates to the field of photocatalytic materials and green hydrogen production technology, specifically to a g-C3N4 / Mn 0.3 Cd 0.7 S-type Z-type heterojunction photocatalyst, its preparation method and application, a g-C3N4 / Mn 0.3 Cd 0.7 The Z-type heterojunction photocatalyst of S is a 2D g-C3N4 sheet supported on 1D Mn. 0.3 Cd 0.7 A composite structure of S nanorods; wherein Mn 0.3 Cd 0.7 The (002) lattice spacing of S is 0.34 nm, the light absorption edge of the composite catalyst is 540±5 nm, the band gap is 2.35~2.55 eV, and the electrochemical double-layer capacitance is 100.85±2 μF·cm. ‑2 The elements C, N, Mn, Cd, and S are uniformly distributed in the catalyst, and the heterojunction interface forms a close contact. The catalyst has ultra-high hydrogen evolution activity, excellent cycle stability, and strong redox capability.
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