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Te-doped CoSb3 skutterudites were successfully synthesized with high pressure synthesis method followed by spark plasma sintering.The introducing of Te atoms into the lattice sites of CoSb3 resulted in n-type electrical conductivity,which increased with elevated Te doping level.An enhanced power factor,larger than 4,000 lWm-1K-2 for temperatures higher than 650 K,was observed for Co4Sb11.5Te0.5.This is a significant value for skutterudites substituted with a single element.Meanwhile,the thermal conductivity of Te-doped CoSb3 was greatly suppressed due to stronger electron–phonon scattering.The optimized Co4Sb11.5Te0.5 showed a ZT value of 1.15 at 883 K,which rivals the state-of-the-art single elemental filled skutterudites.