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Related Concept Videos

Preparation and Reactions of Sulfides02:26

Preparation and Reactions of Sulfides

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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.
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Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
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Sequential Chemistry Toward Core-Shell Structured Metal Sulfides as Stable and Highly Efficient Visible-Light

Xingmiao Zhang1, Haichen Liang1, Haoze Li1

  • 1Department of Chemistry, Laboratory of Advanced Materials, State Key Laboratory of Molecular Engineering of Polymers, and, Collaborative Innovation Center of Chemistry for Energy Materials, Fudan University, Shanghai, 200433, P. R. China.

Angewandte Chemie (International Ed. in English)
|December 11, 2019
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Summary

A new method synthesizes uniform metal sulfide core-shell photocatalysts in water. These novel structures, like CdS@CoSx, significantly boost hydrogen production, outperforming existing materials.

Keywords:
core-shell structuresmetal sulfidessequential chemistryvisible-light photocatalystswater splitting

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Photocatalysis

Background:

  • Developing efficient photocatalysts is crucial for sustainable energy.
  • Metal sulfide nanostructures offer promising light-absorbing properties.
  • Controlling morphology and composition is key to enhancing photocatalytic activity.

Purpose of the Study:

  • To present a universal sequential synthesis strategy for uniform metal sulfide core-shell photocatalysts.
  • To demonstrate the formation of controlled core-shell structures based on solubility products.
  • To evaluate the photocatalytic performance of synthesized materials for hydrogen production.

Main Methods:

  • Sequential synthesis in aqueous solution.
  • Utilizing solubility product constants to control shell formation.
  • Characterization of various metal sulfide core-shell structures (e.g., CdS@CoSx, CdS@MnSx, CdS@NiSx, CdS@ZnSx, CuS@CdS).

Main Results:

  • Achieved highly uniform core-shell structured photocatalysts.
  • Demonstrated a variety of metal sulfide combinations.
  • CdS@CoSx core-shell structures showed exceptional photocatalytic H2 production (3.92 mmol/h) and quantum efficiency (67.3% at 420 nm).

Conclusions:

  • The sequential synthesis strategy is effective for creating uniform metal sulfide core-shell photocatalysts.
  • The synthesized CdS@CoSx core-shell structures exhibit superior photocatalytic activity compared to pure CdS, composites, and Pt-loaded CdS.
  • This approach offers a promising pathway for designing advanced photocatalysts for hydrogen evolution.