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Covalent Bonds01:29

Covalent Bonds

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Overview
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Covalent Bonds01:08

Covalent Bonds

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Overview
When two atoms share electrons to complete their valence shells, they create a covalent bond. An atom's electronegativity—the force with which shared electrons are pulled towards an atom—determines how the electrons are shared. Molecules formed with covalent bonds can be either polar or nonpolar. Atoms with similar electronegativities form nonpolar covalent bonds; the electrons are shared equally. Atoms with different electronegativities share electrons unequally,...
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Covalent Bonding and Lewis Structures02:46

Covalent Bonding and Lewis Structures

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Compared to ionic bonds, which results from the transfer of electrons between metallic and nonmetallic atoms, covalent bonds result from the mutual attraction of atoms for a “shared” pair of electrons.
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Hydrogen Bonds00:26

Hydrogen Bonds

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Hydrogen bonds are weak attractions between atoms that have formed other chemical bonds. One of these atoms is electronegative, like oxygen, and has a partial negative charge. The other is a hydrogen atom that has bonded with another electronegative atom and has a partial positive charge.
Hydrogen Bonds Control the World!
Because hydrogen has very weak electronegativity when it binds with a strongly electronegative atom, such as oxygen or nitrogen, electrons in the bond are unequally shared....
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Hydrogen Bonds

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A hydrogen bond is formed when a weakly positive hydrogen atom already bonded to one electronegative atom (for example, the oxygen in the water molecule) is attracted to another electronegative atom from another polar molecule, such as water (H2O), hydrogen fluoride (HF), or ammonia (NH3). The huge electronegativity difference between the H atom (2.1) and the atom to which it is bonded (4.0 for an F atom, 3.5 for an O atom, or 3.0 for an N atom), combined with the very small size of an H atom...
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Polar Covalent Bonds02:24

Polar Covalent Bonds

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Covalent bonds are formed between two atoms when both have similar tendencies to attract electrons to themselves (i.e., when both atoms have identical or fairly similar ionization energies and electron affinities). Nonmetal atoms frequently form covalent bonds with other nonmetal atoms. For example, the hydrogen molecule, H2, contains a covalent bond between its two hydrogen atoms. When two separate hydrogen atoms with a particular potential energy approach each other, their valence orbitals...
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高性能超電容器としての水素結合の共性有機フレームワーク

Arjun Halder1,2, Meena Ghosh1,2, Abdul Khayum M1,2

  • 1Academy of Scientific and Innovative Research (AcSIR) , CSIR-National Chemical Laboratory , Dr. Homi Bhabha Road , Pune - 411008 , India.

Journal of the American Chemical Society
|August 23, 2018
PubMed
まとめ

この研究では,スーパーキャパシター電極として安定した共価有機フレームワーク (COF) を導入します. 新型COF材料は,電気化学機器の特殊なエネルギー貯蔵能力と長期耐久性を示しています.

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Microfluidic-based Synthesis of Covalent Organic Frameworks COFs: A Tool for Continuous Production of COF Fibers and Direct Printing on a Surface
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科学分野:

  • 材料科学
  • 電気化学
  • ナノテクノロジー

背景:

  • 協和有機フレームワーク (COF) はスーパーコンデンサ (SC) の可能性を示しています.
  • 課題には,性能の低下,不安定性,および粉末形式が含まれ,SCのアプリケーションを制限します.
  • 先進的な電気化学装置のための堅固なCOF材料の必要性

研究 の 目的:

  • リドックス活性で水素結合のCOFを開発し,安定性を向上させる.
  • このCOFを超電容器の独立した電極材料として利用する.
  • COFベースのSCの電気化学性能と安定性を評価する.

主な方法:

  • 新しい水素結合,酸化還元活性COFの合成.
  • フリースタンドの電極のための薄板にCOFの製造.
  • 循環安定性を含む3M水性H2SO4電解質での電気化学試験

主要な成果:

  • COFは濃縮された酸 (H2SO4,HCl) と塩基 (NaOH) で非常に高い安定性を示した.
  • フリースタンドのCOF電極は,面積容量1600 mF cm−2 (169 F g−1) を達成した.
  • 性能とクーロンビック効率を維持した100,000サイクルを超える例外的なサイクル安定性.

結論:

  • 開発されたCOFは,超電容器のための非常に安定で効率的な電極材料です.
  • 独立した性質と優れた電気化学的特性により,従来のCOFの限界を克服します.
  • 高性能エネルギー貯蔵装置の実用的な応用の可能性を示しています.