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The Electrical Double Layer01:30

The Electrical Double Layer

In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...

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在以离子液体为基础的石墨烯热发射调节器中的互干/脱动力学.

Mehedi Hasan Himel1, Zhi Cai2, Ehsan Shamsi3

  • 1Ming Hsieh Department of Electrical Engineering, University of Southern California, Los Angeles, California 90089, United States.

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概括
此摘要是机器生成的。

多层石墨烯装置中的离子液体间隙改变了热发射率. 较高的温度增强了间隔,将热发射率提高到25.5°C,这对于可调节的电子材料至关重要.

关键词:
电解质门的封闭方式石墨烯光电子学光电子学离子介质的离子介质.多层石墨烯多层石墨烯变量的排放率变量.

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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
  • 凝聚物质物理学 凝聚物质物理学

背景情况:

  • 离子液体可以插入到多层石墨烯 (MLG).
  • 这种间隔调节了MLG的热发射率和介电性质.
  • 电化学控制提供了一个调整这些属性的途径.

研究的目的:

  • 在MLG设备中研究电化学驱动的离子液体干的温度依赖性行为.
  • 量化温度对介质程度和由此产生的热发射率变化的影响.
  • 探索这些设备的操作温度极限和影响因素.

主要方法:

  • 用离子液体 ([DEME+][TFSI-]) 和铜电极制造的MLG设备.
  • 使用3.5-4V的电压进行电化学间接.
  • 拉曼光谱法用于监测从10-100°C的间隙.
  • 热成像用于测量温度变化 (7.5-14微米波长).

主要成果:

  • 在MLG中[TFSI-]离子的间隙变化随着温度 (10-100°C) 的增加而改善.
  • 由于介质的明显温度变化随着温度的增加而增加,最高达到25.5°C.
  • 互会导致自由载体度发生两级变化,从而改变复杂的介电函数.
  • 较高的温度会增强间隔,但不会显著影响切断频率.

结论:

  • 温度显著影响MLG设备中离子液体的电化学间隙.
  • 观察到的热发射率变化与载体密度调制直接相关.
  • 设备性能,包括间隔度和有效温度范围,由于离子移动性和扩散动力学,取决于环境温度.