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関連する概念動画

Batteries and Fuel Cells03:12

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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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Electrochemistry is the science involved in the interconversion of electrical and chemical reactions. Such reactions are called reduction-oxidation, or redox reactions. These important reactions are defined by changes in oxidation states for one or more reactant elements and include a subset of reactions involving the transfer of electrons between reactant species. Electrochemistry as a field has evolved to yield sufficient insights on the fundamental principles of redox chemistry and multiple...
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Formation of Complex Ions03:45

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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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Redox Equilibria: Overview01:23

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A reduction-oxidation reaction is commonly called a redox reaction. In a redox reaction, electrons are transferred from one species to another rather than being shared between or among atoms. The reducing agent or reductant is the species that loses electrons and gets oxidized in the process. The species that gains electrons and gets reduced in the process is the oxidizing agent or oxidant. Redox reactions are represented as two separate equations called half-reactions, where one equation...
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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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Ionic Bonding and Electron Transfer02:48

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Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions. 
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関連する実験動画

Updated: Jul 20, 2025

Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
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高性能水性カルシウムイオン電池のための複数のレドックス活性サイトを持つ共振有機フレーム

Siqi Zhang1, You-Liang Zhu2, Siyuan Ren1

  • 1State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun 130012, People's Republic of China.

Journal of the American Chemical Society
|August 1, 2023
PubMed
まとめ

窒素豊富な共性有機フレームワーク (TB-COF) は,カルシウムイオン電池 (CIB) の有望な解決策を提供します. この新しい水性アノードは,ユニークなCa2+/H+共間取りと新しいC=Cサイトを利用することで,高い容量と例外的なサイクル寿命を示しています.

さらに関連する動画

A Protocol for Electrochemical Evaluations and State of Charge Diagnostics of a Symmetric Organic Redox Flow Battery
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Elemental-sensitive Detection of the Chemistry in Batteries through Soft X-ray Absorption Spectroscopy and Resonant Inelastic X-ray Scattering
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Elemental-sensitive Detection of the Chemistry in Batteries through Soft X-ray Absorption Spectroscopy and Resonant Inelastic X-ray Scattering

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関連する実験動画

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A Protocol for Electrochemical Evaluations and State of Charge Diagnostics of a Symmetric Organic Redox Flow Battery
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Elemental-sensitive Detection of the Chemistry in Batteries through Soft X-ray Absorption Spectroscopy and Resonant Inelastic X-ray Scattering
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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:

  • 有機材料は,カチオン蓄積の可能性があるため,カルシウムイオン電池 (CIB) に魅力的です.
  • 高性能CIBを阻害する主な課題は,有機物質の電解質の溶解度が高く,電子伝導性が低いことです.

研究 の 目的:

  • 高性能CIBのための新しい有機アノド材料を設計し,調査する.
  • CIBアプリケーションの有機材料の溶解性と伝導性の限界に対処する.

主な方法:

  • 多数のカルボニルを含む窒素豊富な共性有機基板 (TB-COF) の合成
  • CIBにおける水性アノドとしてのTB-COFの電気化学試験,容量,速度性能,サイクルライフ測定を含む.
  • イオン貯蔵機構と活性部位を明らかにするための計算と経験的研究.

主要な成果:

  • TB-COFは1. 0Ag-1で253mAhg−1の高い可逆容量を示した.
  • 3000サイクル後の5 A g−1で,サイクル毎の0. 01%の容量崩壊のみで,例外的に長いサイクル寿命.
  • COとCNの部位とのCa2+/H+の共同インターケレーションとケラティングの検証と,Ca2+貯蔵のための新しいCC活性部位の発見.

結論:

  • TB-COFはCIBの有機アノドにおける溶解性と伝導性の課題を効果的に克服しています.
  • 材料は,多段階のインターケレーションプロセスを通して,重複単位あたり最大9個のCa2+イオンを貯蔵する高い容量を示しています.
  • この研究では,ラジカル中間物質と新しいCC活性部位を含むリドックスメカニズムが解明され,先進的な有機電極材料への道が開かれました.