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Electrolysis03:00

Electrolysis

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In a galvanic cell, the electrical work is done by a redox system on its surroundings as electrons produced by the spontaneous redox reactions are transferred through an external circuit. Alternatively, an external circuit does work on a redox system by imposing a voltage sufficient to drive an otherwise nonspontaneous reaction in a process known as electrolysis. For instance, recharging a battery involves the use of an external power source to drive the spontaneous (discharge) cell reaction in...
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Ion Exchange01:17

Ion Exchange

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Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
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Spontaneous Chemical Reactions
Spontaneous redox reactions occur abundantly in nature. The chemical reaction occurring in a disposable AA battery powering our remote controls is one such example of a spontaneous redox reaction. Another example is the immersion of coiled copper wire into an aqueous silver nitrate solution. The reaction shows a gradual, visually impressive color change from colorless to bright blue and the formation of a grey precipitate on the copper wire. In this experiment,...
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Interfacial electrochemical methods focus on the phenomena occurring at the boundary between an electrode and a solution, as opposed to bulk methods that concentrate on the solution's overall properties. These interfacial methods are classified as either static or dynamic based on the presence of a nonzero current in the electrochemical cell and the consistency of analyte concentrations. Static methods, such as potentiometry, measure the cell's potential without any significant current...
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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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A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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固体電気化学反応を用いたプロトン駆動インターキャレーションとイオン置換

Masaya Fujioka1, Chuanbao Wu2, Naoki Kubo1

  • 1Research Institute for Electronic Science, Hokkaido University , Sapporo, Hokkaido 001-0020, Japan.

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

新しい陽子駆動イオン導入 (PDII) 方法は,先進的な材料の固体合成を可能にします. この液体なしの技術は高電場を使って 効率的に様々なイオンを インターケラして 新しいメタステーブルな相を生成します

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Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
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Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques
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科学分野:

  • 材料科学
  • 電気化学
  • 固体化学

背景:

  • 新しい合成方法の開発は 材料科学の進歩に不可欠です
  • 従来の固体反応は,イオン間隔と置換効率に制限があります.

研究 の 目的:

  • 材料科学のための新しい合成方法であるプロトン駆動イオン導入 (PDII) を実証する.
  • イオンインターキャラと置換のためのPDIIの可能性を調査する.

主な方法:

  • 固体電気化学反応で,陽子が単価イオンを駆動する.
  • 液体のないプロセスにおける高電圧 (キロボルト) の適用
  • Li+,Na+,K+,Cu+,およびAg+をTaS2単結晶にインターキャラする.

主要な成果:

  • 結晶性を維持しながら,複数の単価イオンをTaS2に成功裏にインターキャラする.
  • PDIIは,従来の方法と比較して,NASICON構造のNa3-xKxV2(PO4) 3に15倍以上のK+を導入しました.
  • 熱力学的に安定した段階の形成は,以前は報告されていなかった.

結論:

  • プロトン駆動イオン導入 (PDII) は,固体イオンインターキャラと置換のための効果的な方法である.
  • PDIIによって可能になった高い電場はイオン置換を加速し,材料の性能を向上させます.
  • PDIIは新しい機能的化合物と転移性フェーズを作成する可能性があります.