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Exfoliation Route to Nanostructured Cobalt Oxide with Enhanced Thermoelectric Performance

We report on two dimensional (2D)-nanostructured NaxCoO2 with enhanced thermoelectric properties prepared by the exfoliation/restacking method. We have shown that the exfoliation/restacking method is an effective route to constructing nanostructured cobalt oxide. Such a nanostructured sodium cobalt oxide results in an exceptionally low cross-plane conductivity, as low as 0.5 W m-1 K-1. Due to the decrease of in-plane thermal conductivity, Z T values of the restacked samples increase in comparison to that of the pristine, which shows the beneficial effect of the nanostructure on the thermoelectric property.