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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 Powerfactor of NaCo2O4 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·2m-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.
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 Powerfactor of NaCo2O4 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 · 2m-1 · K-2 and 11% bigger than that of the Done 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. results indicate that suitable dopants and addition amounts could improve the thermoelectric properties of NaCo2O4 greatly.