High thermoelectric performance of In, Yb, Ce multiple filled CoSb3 based skutterudite compounds

► TE properties of Yb,In,Ce multiple-filled YbxInyCezCo4Sb12 skutterudites were investigated. ► Thermal conductivity is strongly suppressed by multiple filling of Yb, Ce and In. ► Small amounts of Ce and In with Yb are beneficial for the enhancement of TE performance. ► The highest ZT=1.43 was achieved with Yb0.07In0.094Ce0.065Co4Sb11.92 at 800 K.