Study on the Factors Influencing the Performance Attenuation of Skutterudite Thermoelectric Devices
ZUO Tong1, TANG Xian1,*, LI Xin1,*, HE Hu1, NIU Changlei1, SUI Jiehe2, GUO Fengkai2
1 Institute of Nuclear Technology, China Institute of Atomic Energy, Beijing 102413, China 2 School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
Abstract: The performance of thermoelectric devices directly affects the conversion efficiency and service life of thermoelectric conversion devices. This work focused on the issue of performance degradation of cobalt-based thermoelectric devices in high-temperature service environments. A high-power thermoelectric device testing system was used to study the factors affecting the service performance of thermoelectric devices. The research results indicate that the output power of the cobaltite thermoelectric conversion device significantly decreases with time, mainly due to the mutual reaction among the skutterudite compound, electrode material, and Fe-based diffusion barrier layer under high temperature conditions, resulting in an increase in interface resistance. At the same time, due to the poor thermal expansion matching among the thermoelectric materials, electrode materials and Fe-based diffusion barrier layer, the welding interface cracks under high temperature conditions, and the internal resistance of the thermoelectric device increases. From this, it can be seen that the high-temperature stability and thermal expansion matching of the diffusion barrier layer are the key factors affecting the performance of skutterudite thermoelectric devices, and have become the core issues for the subsequent engineering applications of skutterudite thermoelectric devices.
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2024, Vol. 38 
