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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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A battery is a galvanic cell that is used as a source of electrical power for specific applications. Modern batteries exist in a multitude of forms to accommodate various applications, from tiny button batteries such as those that power wristwatches to the very large batteries used to supply backup energy to municipal power grids. Some batteries are designed for single-use applications and cannot be recharged (primary cells), while others are based on conveniently reversible cell reactions that...
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Thiols are prepared using the hydrosulfide anion as a nucleophile in a nucleophilic substitution reaction with alkyl halides. For instance, bromobutane reacts with sodium hydrosulfide to give butanethiol.
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Sulfonation of benzene is a reaction wherein benzene is treated with fuming sulfuric acid at room temperature to produce benzenesulfonic acid. Fuming sulfuric acid is a mixture of sulfur trioxide and concentrated sulfuric acid.
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Polysulfide Tandem Conversion for Lithium-Sulfur Batteries.

Zhilong Wang1, Jianxiong Gao1, Shimeng Zhang1

  • 1State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, 100029, P. R. China.

Small (Weinheim an Der Bergstrasse, Germany)
|January 7, 2025
PubMed
Summary

A novel tandem electrocatalyst with cobalt and zinc sites efficiently converts lithium polysulfides in lithium-sulfur batteries. This strategy enhances intermediate reactions, boosting battery capacity and cycle life.

Keywords:
dual‐active siteslithium–sulfur batterypolysulfidetandem catalysis

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Electrocatalytic conversion of polysulfides is vital for lithium-sulfur batteries.
  • Challenges exist in matching sulfur reduction complexity with suitable catalysts.

Purpose of the Study:

  • To develop a tandem conversion strategy for boosting polysulfide intermediate reactions.
  • To design a bifunctional electrocatalyst with cobalt and zinc sites for lithium-sulfur batteries.

Main Methods:

  • Fabrication of a cobalt and zinc (Co/Zn) electrocatalyst.
  • Investigation of the tandem catalysis mechanism for polysulfide transformation.
  • Electrochemical performance testing of lithium-sulfur cells.

Main Results:

  • The Co/Zn catalyst facilitates the conversion of S8 to Li2S4 (via Zn sites) and the subsequent reduction of Li2S4 (via Co sites).
  • Achieved high initial discharge capacity (1347.5 mAh g-1 at 0.1 C).
  • Demonstrated excellent rate performance (796.8 mAh g-1 at 3 C) and cycle stability (0.086% decay per cycle at 3.0 C).

Conclusions:

  • The tandem catalysis approach effectively enhances multi-step polysulfide conversion.
  • Coordinated design of catalytic sites is crucial for optimizing complex electrochemical reactions in batteries.
  • This strategy offers insights for developing advanced electrocatalysts for high-performance lithium-sulfur batteries.