Engineering topics
Publications and source records attributed to Wang, Guiwen.
Correction for ‘High thermoelectric performance in complex phosphides enabled by stereochemically active lone pair electrons’ by Xingchen Shen et al. , J. Mater. Chem. A , 2018, 6 , 24877–24884.
An alternative strategy to create optimum band shape for superior thermoelectric performance by utilizing stereochemically active lone pair electrons is proposed, which has been demonstrated in the Ag 6 Ge 10(1 -x ) Ga 10 x P 12 .
Highlights: • Pure phase of Cu1-xAgxInTe2 solid solutions is synthesized successfully via solid state reaction. • Solid solution is an effective way to lower lattice thermal conductivity. • A zT larger than 1.0 is obtained in CuInTe2 based compounds. - Abstract: Solid solution is an effective way to optimize thermoelectric performance because of the enhanced phonon scattering from point defect. In this article we describe the synthesis and discuss thermoelectric properties of Cu{sub 1-x}Ag{sub x}InTe{sub 2} solid solutions (x = 0, 0.05, 0.15, 0.30, 0.50). The effect of the substitution of Ag for Cu site on the microstructure and thermoelectric performance in CuInTe{sub 2} is investigated. The enlarged Seebeck coefficient coupled with reduced electrical conductivity is observed due to the diminished carrier concentration upon Ag substitution. Meanwhile, the lattice thermal conductivity is significantly depressed in solid solutions due to the strong phonon scattering. As a result, a zT value of 1.07 is achieved at 823 K with x = 0.05, which is a 90% improvement as compared with that of the pristine CuInTe{sub 2}. These results demonstrate a valid approach to improve the thermoelectric properties of the compounds in the same family.
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The influence of hierarchical TiO 2 inclusions on electrical and thermal transport properties has been investigated in the Ba-filled skutterudite compound Ba 0.3 Co 4 Sb 12 synthesized by ball milling followed by hot pressing. The hierarchical TiO 2 , with the morphology of nanocrystallite aggregates, was prepared using a carbon sphere-templated method. It was found that TiO 2 inclusions strongly enhance the Seebeck coefficient while they weakly degrade the electric conductivity. In addition, TiO 2 inclusions reduce significantly the lattice thermal conductivity through all-scale length phonon scattering due to the hierarchically-structured TiO 2 particles. ZT values up to 1.2 were obtained for Ba 0.3 Co 4 Sb 12 with an optimal amount and dispersion of TiO 2 inclusions. These observations reported here demonstrate an exciting scientific opportunity to raise the figure-of-merit of filled skutterudites via hierarchical dispersion.