"Thermal Charging" Phenomenon in Electrical Double Layer Capacitors
"Thermal Charging" Phenomenon in Electrical Double Layer Capacitors
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DOI：
10.1021/acs.nanolett.5b01761
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发表时间：
2015-09-01
期刊：
影响因子：
10.8
通讯作者：
Chen, Gang
中科院分区：
文献类型：
--
作者：
Wang, Jianjian;Feng, Shien-Ping;Chen, Gang
双电层电容器 (EDLC) 通常通过在正极和负极之间施加电位差来充电。在本文中，我们证明了双电层电容器可以通过加热来充电。通过将超级电容器加热到65摄氏度，可以观察到80-300 mV的开路电压。高温产生的电荷可以在回到室温后存储在器件中，从而可以通过串联“热充电”超级电容器来点亮LED。其潜在机制与热电化学过程有关，该过程在较高温度下增强了电极表面法拉第过程的动力学（例如，官能团的表面氧化还原反应，或电解质离子的化学吸附/解吸）。研究了“热充电”次数、激活电压、速率和时间对“热充电”电压的影响，并讨论了可能的机制。
Electrical double layer capacitors (EDLCs) are usually charged by applying a potential difference across the positive and negative electrodes. In this paper, we demonstrated that EDLCs can be charged by heating. An open circuit voltage of 80-300 mV has been observed by heating the supercapacitor to 65 degrees C. The charge generated at high temperature can be stored in the device after its returning to the room temperature, thus allowing the lighting up of LEDs by connecting the "thermally charged" supercapacitors in a series. The underlying mechanism is related to a thermo-electrochemical process that enhances the kinetics of Faradaic process at the electrode surface (e.g., surface redox reaction of functional group, or chemical adsorption/desorption of electrolyte ions) at higher temperature. Effects of "thermal charging" times, activation voltage, rate, and times on "thermally charged" voltage are studied and possible mechanisms are discussed.