Effect of coated TiO2 nano-particle on thermoelectric performance of TiC0.5O0.5 Ceramics

The polycrystalline TiO2@TiC0.5−xO0.5+x ceramics with core-shell structure were prepared through the spark plasma sintering process. Both thermoelectric (TE) transport properties and microstructure of the ceramics were investigated. The TiO2 shell had a remarkable effect on the transport properties of the system. Large electrical conductivity and thermopower was observed in coating 15% TiO2@TiC0.5O0.5 sample. The maximum power factor is 8.1 × 10−4 W m−1 K−2 and the corresponding ZT value is 0.3 at 873 K for 15% TiO2@TiC0.5O0.5.

► The core-shell compound material i.e., TiO2 as shell and TiC0.5O0.5 as core are synthesized using solid state reaction.
► Nanoscale TiO2 interface is formedas crystalline boundaries coating over Ti0.5C0.5O core.
► The maximum power factor is achieved at 8.1 × 10−4 W m−1 K−2 and the corresponding ZT value is 0.3 at 873 K for 15% TiO2@TiC0.5O0.5.