Enhanced thermoelectric properties of NaxCoO2 whisker crystals
G. Peleckis, T. Motohashi, M. Karppinen, and H. Yamauchi
TL;DR
This study reports the growth of NaxCoO2 whisker crystals with enhanced thermoelectric properties, analyzing their transport characteristics and growth mechanism, leading to improved power-factor at room temperature.
Contribution
It introduces an unconventional growth method for NaxCoO2 whiskers and provides detailed analysis of their transport properties and growth mechanism.
Findings
Electrical resistivity at 300 K is 102 u ohm cm.
Thermoelectric power at 300 K is 83 uV/K.
Power-factor is enhanced to ~68 uW/K2 cm.
Abstract
Single-crystalline whiskers of thermoelectric cobalt oxide, NaxCoO2, have been grown by an unconventional method from potassium-containing compositions, and their transport properties, and chemical compositions were determined. The growth mechanism was analyzed and interpreted by means of thermogravimetric analysis. At 300 K, electrical resistivity r and thermoelectric power S of the whisker are 102 u ohm cm and 83 uV/K, respectively. The power-factor, S2/r, thus is enhanced up to ~ 68 uW/K2 cm.
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