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Related Concept Videos

Preparation and Reactions of Sulfides02:26

Preparation and Reactions of Sulfides

Sulfides are the sulfur analog of ethers, just as thiols are the sulfur analog of alcohol. Like ethers, sulfides also consist of two hydrocarbon groups bonded to the central sulfur atom. Depending upon the type of groups present, sulfides can be symmetrical or asymmetrical. Symmetrical sulfides can be prepared via an SN2 reaction between 2 equivalents of an alkyl halide and one equivalent of sodium sulfide.
Heterogeneous Catalysis01:22

Heterogeneous Catalysis

Heterogeneous catalysis involves a catalyst in a different phase from the reactants. It is a process where the catalyst and the reactants are in distinct phases, typically solid and gas or liquid.Most heterogeneous catalysts are metals, metal oxides, or acids. The list includes transition metals like iron (Fe), cobalt (Co), nickel (Ni), palladium (Pd), platinum (Pt), chromium (Cr), manganese (Mn), tungsten (W), silver (Ag), and copper (Cu). These metals possess partially vacant d orbitals that...

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Synthesis and Performance Evaluations of ZnCoS/ZnCdS with Twin Crystal Structure for Multifunctional Redox Photocatalysis in Energy Applications
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Multicomponent sulfides as narrow gap hydrogen evolution photocatalysts.

Shigeru Ikeda1, Takayuki Nakamura, Takashi Harada

  • 1Research Center for Solar Energy Chemistry, Osaka University, 1-3 Machikaneyama, Toyonaka, Osaka 560-8531, Japan. sikeda@chem.es.osaka-u.ac.jp

Physical Chemistry Chemical Physics : PCCP
|September 21, 2010
PubMed
Summary

Mixed crystals of copper silver tin sulfide (CZTS) and zinc sulfide (ZnS) were synthesized. Optimal photocatalytic activity for hydrogen evolution requires both dissolved ZnS and silver (Ag) components for efficient water reduction.

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Area of Science:

  • Materials Science
  • Photocatalysis
  • Semiconductor Chemistry

Background:

  • Kesterite-structured compounds like Cu2ZnSnS4 are promising for solar energy applications.
  • Understanding the effects of alloying and doping on their properties is crucial for enhancing photocatalytic performance.

Purpose of the Study:

  • To synthesize and characterize mixed crystals of (Cu(x)Ag(1-x))(2)ZnSnS4 and ZnS.
  • To investigate the influence of ZnS and Ag incorporation on the band structure and photocatalytic activity for hydrogen evolution.

Main Methods:

  • Co-precipitation of metal ions followed by annealing in a sulfur atmosphere.
  • X-ray diffraction (XRD) and energy-dispersive X-ray (EDX) analysis for structural and compositional confirmation.
  • Photocatalytic evaluation for H2 evolution under simulated solar radiation (AM 1.5) with Ru catalyst loading.

Main Results:

  • Successful synthesis of solid solutions of (Cu(x)Ag(1-x))(2)ZnSnS4 with limited ZnS solubility (<0.1 ratio).
  • ZnS incorporation led to upward shifts in conduction band edges.
  • The presence of Ag facilitated n-type conductivity, enhancing electron migration for H2 evolution.

Conclusions:

  • Optimal photocatalytic activity for H2 evolution is achieved in (Cu(x)Ag(1-x))(2)ZnSnS4 when incorporating both ZnS and Ag.
  • ZnS modifies the band structure, while Ag promotes efficient charge separation and water reduction.