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Batteries and Fuel Cells03:12

Batteries and Fuel Cells

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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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Weak Acid Solutions04:02

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Few compounds act as strong acids. A far greater number of compounds behave as weak acids and only partially react with water, leaving a large majority of dissolved molecules in their original form and generating a relatively small amount of hydronium ions. Weak acids are commonly encountered in nature, being the substances partly responsible for the tangy taste of citrus fruits, the stinging sensation of insect bites, and the unpleasant smells associated with body odor. A familiar example of a...
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Acid halides are reduced to alcohols in the presence of a strong reducing agent like lithium aluminum hydride.
The mechanism proceeds in three steps. First, the nucleophilic hydride ion attacks the carbonyl carbon of the acid halide to form a tetrahedral intermediate. Next, the carbonyl group is re-formed, and the halide ion departs as a leaving group, generating an aldehyde. A second nucleophilic attack by the hydride yields an alkoxide ion, which, upon protonation, gives a primary alcohol as...
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Protocol of Electrochemical Test and Characterization of Aprotic Li-O2 Battery
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リチウム酸素電池の溶液相二機能触媒である.

Dan Sun1, Yue Shen, Wang Zhang

  • 1State Key Laboratory of Material Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology , Wuhan, Hubei 430074, China.

Journal of the American Chemical Society
|May 16, 2014
PubMed
まとめ
この要約は機械生成です。

鉄ファタロシアニン (FePc) はリチウム酸素電池のシャトルとして作用し,直接の炭素接触なしに反応を促進することによって性能を改善します. この分子シャトルアプローチは,充電可能なリチウム空気電池の実用化を可能にします.

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科学分野:

  • 電気化学 電気化学について
  • マテリアルサイエンス 材料科学
  • エネルギー貯蔵 エネルギー貯蔵

背景:

  • リチウム酸素電池はエネルギー密度が高いが,カソド反応の課題に直面している.
  • 固体触媒だけでは,空気カトドの多相電気化学反応を容易にするのに苦労します.

研究 の 目的:

  • リチウム酸素電池における分子シャトルとして鉄フタロシアニン (FePc) の使用を調査する.
  • カソード反応の制限に対処することによって,リチウム酸素電池の電気化学性能を向上させる.

主な方法:

  • 鉄フタロシアニン (FePc) を有機電解質で溶解する.
  • FePcを使用して,超酸化物種 (O2-) と電子をシャトルします.
  • カソード上の過酸化リチウム (Li2O2) の成長と分解を観察した.

主要な成果:

  • FePcは,導体表面とLi2O2.2.の間のO2と電子を効果的にシャトルします.
  • リチウム過酸化物 (Li2O2) の成長と分解は,炭素と直接接触することなく発生しました.
  • リチウム酸素電池システムでは,電気化学性能の向上が観察されました.

結論:

  • FePcのような触媒活性分子シャトルは,リチウム酸素電池カトドの限界を克服することができます.
  • 分子シャトルの使用は,実用的な充電可能なリチウム空気電池を開発するための有望な戦略です.