Thermoelectric Characterization of (Na1-yMy)1.6Co2O4 (M=K, Ca, Sr)

Abstract

Abstract: Oxide materials NaCo2O4 and (Na1-yMy)1.6Co2O4 (M=K, 0.05≤y≤0.35; M=Ca, Sr, 0.10≤y≤0.40) were prepared by a sol-gel method. Experimental results indicated that the Seebeck coefficient and the Power-factor of Na Co2O4 were improved by doping Ca and Sr but not by K. The Power-factor of NaCo2O4 is in its maximum, 1.68×10-4 W•m-1•K-2 and 11% bigger than that of the original one when the dopant fraction of Ca was 0.1. Doping Sr makes NaCo2O4 have the biggest Power-factor, 1.68×10-4 W•m-1•K-2 that is 50% bigger than the non-doping oxide. The experimental results indicate that suitable dopants and addition amounts could improve the thermoelectric properties of NaCo2O4 greatly.

Key words: Thermoelectric materials, Electric properties, Sol-Gel method, Doping

Ying LI, Guiying XU, Maofa JIANG. Thermoelectric Characterization of (Na1-yMy)1.6Co2O4 (M=K, Ca, Sr)[J]. J Mater Sci Technol, 2006, 22(04): 526-528.

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