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MOS Capacitor01:25

MOS Capacitor

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A Metal-Oxide-Semiconductor (MOS) capacitor is a fundamental structure used extensively in semiconductor device technology, particularly in the fabrication of integrated circuits and MOSFETs (metal-oxide-semiconductor field-effect transistors). The MOS capacitor consists of three layers: a metal gate, a dielectric oxide, and a semiconductor substrate.
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Equivalent Capacitance01:19

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Multiple capacitors can be connected in a circuit in series or parallel configuration. When the capacitor combination is connected to a battery, the potential drop across each capacitor and the magnitude of charge stored in the individual capacitor depends on the type of the connection. The capacitor combination is replaced by a single equivalent capacitor that stores the same amount of charge as the combination for a given potential difference.
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Equivalent Capacitance01:19

Equivalent Capacitance

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From the study of resistive circuits, it is understood that employing a series-parallel combination serves as an effective strategy for simplifying circuits. Capacitors can be arranged within a circuit in one of two ways: a series configuration or a parallel configuration. The way these capacitors are connected to a battery will influence both the potential drop across each individual capacitor and the size of the charge that each capacitor can store. This is determined by the specific type of...
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Capacitor With A Dielectric01:18

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Parallel plate capacitors consist of two conducting plates separated by a certain distance. However, it is mechanically difficult to hold the large plates parallel to each other without actual contact. Hence, a dielectric layer is commonly placed between the plates, which provides an easy solution for holding the plates together with a small gap and increases the capacitance of the capacitor.
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In integrated circuit technology, a capacitance multiplier is often utilized to produce a larger capacitance value when a small physical capacitance falls short. This is achieved by a circuit that multiplies capacitance values by a factor of up to 1000, such that a 10-pF capacitor can replicate the performance of a 100-nF capacitor.
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A spherical capacitor consists of two concentric conducting spherical shells of radii R1 (inner shell) and R2 (outer shell). The shells have  equal and opposite charges of +Q and −Q, respectively. For an isolated conducting spherical capacitor, the radius of the outer shell can be considered to be infinite.
Conventionally, considering the  symmetry, the electric field between the concentric shells of a spherical capacitor is directed radially outward. The magnitude of the field,...
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高体積密度偽容量のための精密に設計されたメソスコピック・タイタニア

Kun Lan1, Lu Liu1, Jun-Ye Zhang1

  • 1Laboratory of Advanced Materials, Department of Chemistry, State Key Laboratory of Molecular Engineering of Polymers, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Fudan University, Shanghai 200433, People's Republic of China.

Journal of the American Chemical Society
|August 11, 2021
PubMed
まとめ

研究者は,高密度の擬態容量エネルギー貯蔵のための二酸化チタン (TiO2) 構造をメソスケールで開発した. この設計は,ナノ材料の容量の制限を克服し,高度なバッテリーの高速充電と高出力を可能にします.

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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:

  • 表面リドックスシドオキャパシタンスでは,急速充電と高出力を提供し,エネルギー貯蔵アプリケーションに不可欠です.
  • 活性物質をナノ構造化することで,特定の容量が向上しますが,しばしば,タンプの密度が低いため,体積容量が低下します.

研究 の 目的:

  • メソスケールTiO2構造を設計することによって高密度シドオキャパシティブ材料を開発する.
  • エネルギー貯蔵におけるナノマテリアルの低容量制限を克服する.

主な方法:

  • メソスケールTiO2を制御されたメソポラスフレームワークと放射的に並べたチャネルで製造する.
  • ナトリウムイオン貯蔵アノドとしての表面積,タップ密度,および電気化学性能の特徴.

主要な成果:

  • メソスコピックTiO2は,ナノ粒子 (0.47gcm-3) に比べて高いタップ密度を示した.
  • 最大重量計容量 (240 mAh g-1) と最大容量 (350 mAh cm-3) を 0.025 A g-1 で達成した.
  • 高質量負荷 (9.47 mg cm-2) で商業的に比較可能な面積容量 (2.1 mAh cm-2) を実証した.

結論:

  • 精密に設計されたメソスケールTiO2構造は,高密度シドオキャパシティブモデルシステムとして機能します.
  • このメソ構造は,高出力や高速充電装置への影響を伴って,密度の高いナノ構造に素早くナトリウム化を可能にします.