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相关概念视频

Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
Fermi Level Dynamics01:12

Fermi Level Dynamics

The vacuum level denotes the energy threshold required for an electron to escape from a material surface. It is usually positioned above the conduction band of a semiconductor and acts as a benchmark for comparing electron energies within various materials.
Electron affinity in semiconductors refers to the energy gap between the minimum of its conduction band and the vacuum level and it is a critical parameter in determining how easily a semiconductor can accept additional electrons.
The work...

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相关实验视频

Updated: Jul 7, 2026

Simultaneous Multi-surface Anodizations and Stair-like Reverse Biases Detachment of Anodic Aluminum Oxides in Sulfuric and Oxalic Acid Electrolyte
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解码阳极的界面演变和构建多功能层,以实现超长周期稳定性.

Bo Long1, Feng Wu1,2, Yu Li1,2

  • 1Beijing Key Laboratory of Environmental Science and Engineering, School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China.

Journal of the American Chemical Society
|March 2, 2026
PubMed
概括

研究人员开发了一种新的金属有机框架 (MOF-C) 层,用于稳定可充电电池 (RAB) 中的阳极. 这项创新通过防止阳极退化和腐蚀,显著提高了电池寿命,为实际应用铺平了道路.

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Iron Nanowire Fabrication by Nano-Porous Anodized Aluminum and its Characterization
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The Effect of Anodization Parameters on the Aluminum Oxide Dielectric Layer of Thin-Film Transistors
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科学领域:

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

背景情况:

  • 可充电电池 (RAB) 提供了高的理论容量,但受到阳极不稳定的影响.
  • 在离子液体电解质中极接口的动态演变是实际应用的关键挑战.
  • 电解质中的伊米达酸 (EMI+) 被确定为阳极降解和不稳定的主要驱动因素.

研究的目的:

  • 了解阳极在离子液体电解质中的界面演变.
  • 开发一种防护层,减轻阳极降解,增强RAB中的循环稳定性.
  • 解决阻碍RABs大规模应用的长期接口问题.

主要方法:

  • 使用先进的现场表征来研究阳极接口动态.
  • 设计了一种具有选择性纳米通道的金属有机框架 (MOF-C) 层.
  • 用于阻断腐蚀性离子 (EMI+) 和促进离子 (AlCl4-) 扩散的差异性访问机制.

主要成果:

  • 在阳极上观察到从树形成到腐蚀的过渡.
  • 设计的MOF-C层有效地阻断了腐蚀性EMI+离子,同时促进了AlCl4-扩散.
  • 经过修改的Al/MOF-C阳极在对称细胞中表现出超过11000小时的异常循环稳定性.
  • 带有天然石墨阴极的全电池在500个循环中保持了95%的容量.

结论:

  • 伊米达酸 (EMI+) 是RAB中阳极降解的主要原因.
  • MOF-C 层通过控制界面演变,为稳定的阳极提供了有效的解决方案.
  • 这项工作为开发下一代稳定可充电电池制定了可行的战略.