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Preparation and Reactions of Sulfides02:26

Preparation and Reactions of Sulfides

5.9K
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.
5.9K
Electrodeposition01:08

Electrodeposition

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Electrodeposition is a technique used to separate an analyte from interferents by electrochemical processes. Here, the analyte is a metal ion that can be deposited on an electrode immersed in the sample solution. The electrochemical setup consists of an anode and a cathode. When an electric current is applied to the setup, oxidation occurs at the anode. At the cathode, which consists of a large metal surface, metal ions undergo reduction and deposit onto the surface.
Electrodeposition can...
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Extraction: Advanced Methods00:56

Extraction: Advanced Methods

1.2K
Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
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Simple Methods for the Preparation of Non-noble Metal Bulk-electrodes for Electrocatalytic Applications
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アモルフ金属ポリ硫化物: 独特の挿入/抽出反応を持つ電極材料

Atsushi Sakuda1, Koji Ohara2,3, Katsutoshi Fukuda2

  • 1Research Institute of Electrochemical Energy, Department of Energy and Environment, National Institute of Advanced Industrial Science and Technology (AIST) , 1-8-31 Midorigaoka, Ikeda, Osaka 563-8577, Japan.

Journal of the American Chemical Society
|June 17, 2017
PubMed
まとめ

研究者らは,無形亜硫化チタン (TiS4) 電極で新しい充電/放電メカニズムを発見した. インターケレーションと変換を組み合わせたこの独特なプロセスは,高度なエネルギー貯蔵アプリケーションに大幅に大きな容量を可能にします.

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科学分野:

  • 材料科学
  • 電気化学
  • エネルギー貯蔵

背景:

  • 変形変異金属ポリ硫化物電極は,異常な充電/放電行動を示している.
  • 既存のメカニズム (インターケレーション/変換) は,その性能を完全に説明できません.
  • アモルフな構造を分析することは,重要な分析的な課題を提示します.

研究 の 目的:

  • 変形型二硫化チタン (TiS4) 電極のユニークな充電/放電メカニズムを解明する.
  • これらの新しい電極材料の性能を制御する構造的変換を理解する.
  • アモルフな電極材料の新しいモデルを提案する.

主な方法:

  • リチウムイオン挿入/抽出中の構造変化のインサイト分析.
  • アモルフなチタン二硫化物 (TiS4) の電極材料の特徴
  • 電気化学性能テスト

主要な成果:

  • 純粋なインターケレーションまたは変換とは異なる新しい充電/放電メカニズムが特定されました.
  • 二つの重要な構造変化が観察された:S-S二硫化物結合のダイナミクスとチタンの調整数の変化.
  • これらの構造の変化は,リチウムイオンサイクル中に継続的に,協調的に起こります.
  • この発見は,無形電極材料のユニークなモデルを支持する.

結論:

  • アモルフなTiS4電極は,ハイブリッドの充電/放電メカニズムで動作する.
  • これらの構造的動態を理解することは,無形電極の性能を最適化するための鍵です.
  • この研究は,電池用の高容量無形電極材料の設計に新しいパラダイムを提供します.