研究目的
To enhance the photocatalytic hydrogen evolution activity of CdZnS nanoparticles by doping with nickel as a noble-metal-free cocatalyst for efficient and low-cost water splitting under visible light.
研究成果
Ni doping at 0.5 wt% in CdZnS significantly enhances photocatalytic hydrogen evolution by providing active sites, improving charge separation, and reducing the need for noble metals, achieving a high H2 production rate of 25.4 mmol·g?1·h?1 under visible light.
研究不足
The study is limited to specific Ni doping concentrations and conditions; higher Ni content (e.g., 1-2 wt%) acts as recombination centers, reducing activity. The method may not be scalable or applicable to other systems without optimization.
1：Experimental Design and Method Selection:
A one-step hydrothermal method was used to synthesize Ni-doped CdZnS (CZNS) photocatalysts with varying Ni concentrations (
2：2, 5, 1, 2 wt%) to investigate the effect on photocatalytic activity. Sample Selection and Data Sources:
Precursors included Cd(CH3COO)2·2H2O, Zn(CH3COO)2, Ni(CH3COO)2·4H2O, and Na2S·9H2O, with samples labeled based on Ni content.
3：List of Experimental Equipment and Materials:
A 50 mL Teflon-lined autoclave for hydrothermal synthesis at 200°C for 12 hours; deionized water and ethanol for washing; drying at 60°C.
4：Experimental Procedures and Operational Workflow:
Mix precursors, add Na2S solution, transfer to autoclave, heat, cool, wash, and dry. Photocatalytic tests were conducted under visible light irradiation (λ > 420 nm) in sulfide and sulfite solution.
5：Data Analysis Methods:
Characterization included XRD, TEM, XPS, PL spectroscopy, photoelectrochemical tests, EIS measurements, and electrochemical tests to analyze structure, morphology, composition, and photocatalytic performance.
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