Enhanced thermoelectric performance of Te-doped skutterudite with nano-micro-porous architecture
Enhanced thermoelectric performance of Te-doped skutterudite with nano-micro-porous architecture
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DOI：
10.1016/j.scriptamat.2018.09.015
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发表时间：
2019-01
影响因子：
6
通讯作者：
Houjiang Yang;Pengfei Wen;Xilong Zhou;Yao Li;Bo Duan;P. Zhai;Qingjie Zhang
中科院分区：
文献类型：
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作者：
Houjiang Yang;Pengfei Wen;Xilong Zhou;Yao Li;Bo Duan;P. Zhai;Qingjie Zhang
通过对纳米Co 4Sb 11. 5 Te 0.5/Co 4Sb 11. 5 Te 0. 5复合材料进行退火处理，巧妙地制备了具有纳米至微米尺寸孔隙的Te掺杂Co 4Sb 11. 5 Te 0. 5材料。退火后的样品呈现出显着降低的热导率，由于大量的声子散射在一个宽的波长范围内所获得的全尺度多孔结构。同时，由于较低的载流子浓度，退火样品的Seebeck系数提高。退火100 h的样品在800 K时的无量纲优值为1.2，比致密样品提高了33.7%。
Te-doped Co4Sb11.5Te0.5materials with nano to micro sized pores are fabricated tactfully by annealing the nano-Co4Sb11.5Te0.5/Co4Sb11.5Te0.5composites. The annealed samples present a dramatically reduced thermal conductivity due to the abundant scattering of phonons in a wide wavelength range by the obtained all-scale porous architecture. Meanwhile, the Seebeck coefficient is enhanced for the annealed samples due to the lower carrier concentration. The sample annealed 100 h exhibits an enhanced dimensionless figure of merit of 1.2 at 800 K, increased by 33.7% as compared with that of the dense sample.