SKM 2023 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 17: Poster Session I
CPP 17.48: Poster
Monday, March 27, 2023, 18:00–20:00, P3
Investigating Thermoelectric Properties of a Sodium-based, Solid Polymer-Electrolyte — •Julian-Steven Schilling, Maximilian Frank, and Jens Pflaum — Experimental Physics VI, University of Würzburg, 97074 Würzburg
Motivated by the large amount of available waste heat and the need to use energy more efficiently, the development of thermoelectric generators is becoming increasingly important. Their efficiency is characterized by the thermoelectric figure-of-merit z which includes the electrical conductivity σ, the thermal conductivity κ and the Seebeck coefficient S, respectively, and, at a given temperature T, is given by zT= S2σ/κT. In contrast to electronic thermoelectric materials, ionic systems promise larger Seebeck coefficients due to lower mobility of the participating charge carriers . Therefore, ionic electrolytes based on organic polymers are of interest due to their expected good thermoelectric performance. In this work, first results on the thermoelectric properties of a methacrylate-based solid polymer electrolyte utilizing sodium as conducting salt are presented. By means of impedance spectroscopy in a frequency range from 100 mHz to 500 kHz we analyzed the mechanisms governing the electrical conductivity in the technologically relevant temperature range from 273K to 353K. Complementary, thermovoltage measurements as function of temperature enable the determination of the Seebeck coefficient and, together with impedance spectroscopy data, reveal strategies how the electronic and ionic transport properties can be modified by the respective salt concentration as well as by the ratio of different carbon-based additives.