“Thermal Charging” Phenomenon in Electrical Double Layer Capacitors
Name
Chen_Thermal charging with SI.pdf
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2.68 MB
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Author(s)
Wang, Jianjian
Feng, Shien-Ping
Yang, Yuan
Hau, Nga Yu
Munro, Mary
Ferreira-Yang, Emerald C.
Chen, Gang
Date Issued
August 2015
Journal
Nano Letters
Publisher
American Chemical Society (ACS)
Citation
Wang, Jianjian, Shien-Ping Feng, Yuan Yang, Nga Yu Hau, Mary Munro, Emerald Ferreira-Yang, and Gang Chen. "“Thermal Charging” Phenomenon in Electrical Double Layer Capacitors." Nano Letters 15:9 (2015), pp. 5784-5790.
Version
Author's final manuscript
Abstract
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 °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.
MIT Department
Massachusetts Institute of Technology. Department of Mechanical Engineering
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DOI of Published Version
https://doi.org/10.1021/acs.nanolett.5b01761
