Preparation of carbon quantum dots modified selenium-sulfur zinc-cadmium double electric field embedded super-hydrophilic photocatalyst and application in hydrogen production by water splitting

By in-situ growing carbon quantum dots on the surface of zinc cadmium selenide sulfide, a superhydrophilic photocatalyst with built-in dual electric fields was constructed, which solved the problem of low separation and transport efficiency of photogenerated carriers and achieved high efficiency in photocatalytic hydrogen production and material stability.

CN122321894APending Publication Date: 2026-07-03QINGDAO UNIV OF SCI & TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
QINGDAO UNIV OF SCI & TECH
Filing Date
2026-04-18
Publication Date
2026-07-03

AI Technical Summary

Technical Problem

Existing zinc-cadmium-sulfur-based photocatalysts suffer from low efficiency in photogenerated carrier separation and transport in the field of photocatalytic hydrogen production, and the material surface lacks sufficient hydrophilicity, which affects the adsorption of water molecules and the release of gaseous products.

Method used

Carbon quantum dots were grown in situ on the surface of zinc cadmium selenide using a one-step hydrothermal method. A superhydrophilic photocatalyst with built-in dual electric field was constructed through amide bonding. By combining the dipole polarization electric field, the interfacial electric field and the interfacial amide bond, multiple photogenerated carrier separation and migration channels were formed, thereby improving charge transport efficiency.

Benefits of technology

It achieves high directional transport efficiency of photogenerated carriers, promotes water molecule adsorption and gas product release due to the superhydrophilicity of the material surface, accelerates the reaction through photothermal synergy, and enhances photocatalytic activity and stability.

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Abstract

This invention relates to the preparation and application of a carbon quantum dot-modified zinc cadmium selenide (ZNDS) sulfide with an embedded dual-field superhydrophilic photocatalyst for hydrogen production via water splitting, belonging to the field of photocatalytic hydrogen production technology. The invention uses citric acid and urea as raw materials to prepare hydrophilic carbon quantum dots via a hydrothermal method. Then, zinc acetate dihydrate, cadmium acetate dihydrate, thioacetamide, and a selenium powder-hydrazine hydrate solution are added to the carbon quantum dot system to achieve the preparation of an amide-bonded carbon quantum dot-modified ZNDS sulfide with an embedded dual-field superhydrophilic photocatalyst via a one-step hydrothermal method. The invention also discloses the application of this photocatalyst in hydrogen production via water splitting. Under the synergistic effect of multiple charge transport channels and photocatalysis-thermal catalysis, the photocatalyst significantly improves the directional separation and migration efficiency of photogenerated carriers, achieving a hydrogen production rate of 103.9~126.8 mmol·g under light-driven and thermally assisted conditions. cat ‑1 ·h ‑1 Furthermore, after eight consecutive uses, the photocatalytic activity remained above 91%. Therefore, the prepared photocatalyst has enormous potential for photocatalytic hydrogen production applications.
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