Complete Characterization of Thermoelectric Materials by Impedance Spectroscopy

Abstract

Thermoelectric materials can directly convert waste heat into electricity. Due to the vast amount of energy available as waste heat in our society, these materials could contribute to reduce our dependence on fossil fuels and their associated environmental problems. However, the heat to electricity conversion efficiency of thermoelectric materials is still a limiting factor, and extensive efforts are being undertaken to improve their performance. The search for more efficient materials is focused on the optimization of three properties (Seebeck coefficient, electrical resistivity, and thermal conductivity). Typically, these are determined as function of temperature through

Optimization design of interdigitated microelectrodes with an insulation layer on the connection tracks to enhance efficiency of assessment of the cell viability

“…Recent studies have also shown that the µEIS system is affected by the electrode material, the geometrical arrangement of the electrodes, and the medium composition [ 39 , 51 , 52 ]. Additionally, changes in the temperature of the medium or buffer can also affect the µEIS system’s results [ 53 , 54 ]. Therefore, it is essential to consider these factors when designing a µEIS system to obtain reliable results.…”

High-Temperature Specific Contact Resistance of Iron Disilicide Soldered to Molybdenum by Field’s Metal

“…Above 330 °C, the gallium of the solder reacted with the sample and the blocks, preventing measurement at higher temperature. Low-melting solders, to connect a sample between two brackets of copper, are likewise required for impedance spectroscopy on TE samples. , García-Canadas et al faced degrading reactions at the joints above 250 °C. More and more high-temperature applications are developed for TE materials, many of them extending up to 600 °C, meaning we need reliable characterization methods for their development.…”