In 2019 Obaidallah Mohammad Munteshari presented a Ph.D. dissertation at the University of California in Los Angeles, whose aim was to experimentally measure the heat generated at the electrodes of electrochemical capacitors of different electrode materials under varying charging and discharging conditions.

To accurately measure the generated heat, an in-operando calorimeter was developed, which used two of greenTEG’s gSKIN XP heat flux sensors. The assessment of activated carbon electrodes showed that the reversible heat generation rate in the positive electrode was exothermic during charging and endothermic during discharging. The negative electrode, however, featured both exothermic and endothermic heat generation during both charging and discharging steps. Furthermore, under galvanostatic cycling, the irreversible heat generation rate increased with increasing the potential window. Finally, the separation of EDL (electrical double layer component) current from faradaic current in pseudocapacitive electrodes will further improve the heat generation analysis.

Electrochemical capacitators, also called supercapacitators, are promising electrical energy storage systems due to their potential to achieve both high-energy and high-power densities, combined with a long charge-discharge cycle. Their applications range includes electric vehicles, electricity grids, and energy-conserving and harvesting devices, among others.

At greenTEG, we are happy to collaborate with our sensors in top research pushing forward the applied science in such important fields. If you want more information about the potential applications of heat flux sensors for R&D and research, please download our guide about the topic.

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