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材料科学
Enhanced thermoelectric performance of Bi_2Se_3/TiO_2 composite
Bi_2(Te,Se)_3 alloys are conventional commercial thermoelectric materials for solid-state refrigeration around room temperature.In recent years,much attention has been paid to various advanced thermoelectric composite materials due to the unique thermoelectric properties.In this work,Bi_2Se_3/TiO_2 composites were prepared by hot pressing the plate-like Bi_2Se_3 powders coated in situ with hydrolyzed hytetabutyl-n-butyl titanate(TNBT),and therefore numerous TiO_2 in micrometer size could be formed on the interface of Bi_2Se_3 grains.The carrier concentration in Bi_2Se_3 matrix is optimized subject to the addition of n-type semiconductor TiO_2,contributing to a significant improved power factor.In the meantime,the lattice thermal conductivity is also suppressed due to the enhanced phonon scattering at Bi_2Se_3/TiO_2 interface and amorphous TiO_2 particles.As a consequence,a peak figure of merit(zT) of 0.41 is obtained at 525 K in Bi_2Se_3/15 mol% TiO_2 composites,nearly 50% augment over the pristine Bi_2Se_3 binary compound.
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Rare Metals
2020年08期

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