Thermal signature of ion intercalation and surface redox reactions mechanisms in model pseudocapacitive electrodes

greenTEG’s heat flux sensors have been used to set up an experiment by researchers linked to the University of California (Jonathan Lau, Ampol Likitchatchawankun, Christopher S. Choi, Danielle Butts, Bruce S. Dunn, Laurent Pilon), The King Fahd University of Petroleum and Minerals at Saudi Arabia (Obaidallah Munteshari) and the Beijing Institute of Technology (Bing-Ang Mei). The paper explaining the results is published in the journal Electrochimica Acta.

This study assesses the thermal properties of charge storage mechanisms in hybrid supercapacitors using in operando calorimetry under constant current cycling. A highly porous pseudocapacitive electrode using MoO2 -- rGO or and an activated carbon electrode made up the hybrid supercapacitor. Of interest in the study was the generated reversible and irreversible heat and to distinguish between Joule heating and instantaneous heat generation at the electrodes. To measure the instantaneous heat generation rate, an in-operando calorimeter using greenTEG’s gSKIN® energy transfer sensors was utilized. The results showed that in the activated carbon electrodes, the irreversible heat generation rate was due to resistive losses (i.e., Joule heating) while the reversible heat generation was due to ion adsorption/desorption at the electrolyte/electrode interface. By contrast, the irreversible heat generation rate in the pseudocapacitive electrodes exceeded Joule heating.

The energy transfer sensors built at greenTEG are great for R&D projects with energy storage devices, allowing researchers to easily measure the thermal effects involved in charging and discharging. That also applies not only to capacitators or supercapacitators, but also to li-ion batteries. If you want to learn more about this topic, please check our webpage about the application of heat flux sensors for battery research.

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