A Power-Generation Test for Oxide-Based Thermoelectric Modules Using p-Type Ca3Co4O9 and n-Type Ca0.9Nd0.1MnO3 Legs

作者：Lim Chang Hyun^*; Choi Soon Mok; Seo Won Seon; Park Hyung Ho

来源：Journal of Electronic Materials, 2012, 41(6): 1247-1255.

DOI：10.1007/s11664-011-1868-6

• Power-generation module
• thermoelectric
• oxide
• adhesion strength of electrode

Metal oxides are considered to be promising thermoelectric (TE) materials, especially for high-temperature power-generation applications, because they have many advantages such as low price, light weight, thermal stability, nontoxicity, and high oxidation resistance. For these reasons, oxide-based TE modules were fabricated using -type pure Ca3Co4O9 and -type Ca0.9Nd0.1MnO3 legs for power generation at temperatures in excess of 1000 K. This study involved the use of Ag sheets with a Ag paste as electrode materials and alumina plates as a substrate for the modules. The -type pure Ca3Co4O9 legs were manufactured by spark plasma sintering, and the -type Ca0.9Nd0.1MnO3 legs were sintered by a conventional process at atmospheric pressure. From a unicouple, a power density as high as 93.2 mW/cm(2) under a temperature condition of Delta = 727 K ( (hot) = 1175 K) was obtained. This high power density is believed to be a result of the modified contact of the electrode (notch process) and the optimized material properties (the SPS process and a dopant effect) along with the high Delta obtained in this study (reduced thermal losses because of good packing of thermal insulation). Areas of concern for future research include the following: (1) the measured open-circuit voltage from the present unicouples was only 94.3% of the theoretical voltage, and (2) the internal resistance value was as high as 490% of the theoretical resistance.

• 出版日期2012-6