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相关概念视频

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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Capacitors and Capacitance01:18

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A device consisting of two electrical conductors that are separated by a distance and used to store electrical charges is called a capacitor. The space between the conductors is either a vacuum or an insulating material, called a dielectric. Capacitors have many applications, ranging from filtering static from radio reception to energy storage in heart defibrillators.
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The presence of a dielectric medium in a capacitor not only changes the voltage and capacitance but also affects the electric field. In general, dielectrics can be of two types: polar and nonpolar. In a polar dielectric, the positive and negative charges in the molecules are separated by a distance and hence have a permanent dipole moment. In contrast, no such charge separation exists in a nonpolar dielectric, however the nonpolar molecules get polarized in the presence of an external electric...
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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 parallel plate capacitor, when connected to a battery, develops a potential difference across its plates. This potential difference is key to the operation of the capacitor, as it determines how much electrical energy the capacitor can store.
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A p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...
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处理机制协同表面和间隙伪电容工程快充基阳极材料.

Zhuo Chen1, Qiming Wang2, Shuai Bai1

  • 1Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, 155 Yangqiao Road West, Fuzhou, Fujian, 350002, P. R. China; University of Chinese Academy of Sciences, Beijing, 100049, P. R. China.

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概括

一种基于的导电网络水合物 (Na0.13Mg0.02) V2O5·0.98H2O (NMVO) 的新型导电网络水合物,已被开发用于伪容量储能. 这种材料表现出卓越的稳定性和快速充/放电能力,为先进的电池技术铺平了道路.

关键词:
快速充电储存材料的快速充电储存材料间隔的伪电容性 间隔的伪电容性表面伪电容是指表面的伪电容.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 电化学 电化学 电化学
  • 储能 储能 储能 储能 储能 储能

背景情况:

  • 伪电容材料提供快速充电和放电动力学,这对于高性能储能设备至关重要.
  • 开发具有增强导电性和离子扩散的稳定高效电极材料对于推进电池技术至关重要.

研究的目的:

  • 设计和合成一种新的基于的导电网络水合物, (Na0.13Mg0.02) V2O5·0.98H2O (NMVO),用于伪电容应用.
  • 研究NMVO及其缩小形式 (r-NMVO) 的结构和电化学特性,以提高储能性能.

主要方法:

  • 合成一种基于的导电网络水合物 (NMVO),具有特定的分层结构.
  • 在现场进行电化学处理,以创建具有增强活性位点的层次异构结构 (r-NMVO).
  • 利用第一原理计算,in-situ和ex-situ表征技术来阐明电荷存储机制.

主要成果:

  • 设计的NMVO呈现出具有较大的层间距 (11.67 Å) 的导电网络,促进了快速的离子扩散和导电性.
  • 减少的r-NMVO表明具有多个基于的活性位点的等级异构结构,促进了表面氧化还原假电容.
  • r-NMVO电极实现了显著的循环稳定性,在电池中以50 A g-1的速度在65,500个循环后保持了95.5%的容量.

结论:

  • 开发的r-NMVO材料表现出一个强大的间隙-表面氧化还原假电容机制,导致优越的电化学性能.
  • 该材料强大的脉冲冲击阻力和增强的循环稳定性归因于其集成的异构结构和导电网络.
  • 这项研究为设计下一代储能解决方案的稳定,快充的伪容量材料提供了一条道路.