Improved thermoelectric performance of Te-doped and CNT dispersed CoSb3 skutterudite bulk materials via HTHP
Improved thermoelectric performance of Te-doped and CNT dispersed CoSb3 skutterudite bulk materials via HTHP
复制标题
通过高温高压提高掺碲和碳纳米管分散的 CoSb3 方钴矿块体材料的热电性能
作者：
孙海瑞;贾晓鹏;吕品;邓乐
首次采用高温高压法在Co4Sb11. 5Te0. 5方钴矿块体材料中分散了碳纳米管（CNTs），研究了不同压力下Te和CNTs含量对材料结构和热电性能的影响。与其他传统方法相比，高温高压法的处理时间从几天大幅减少到半小时。随着温度的升高，功率因数明显增大，导热系数明显下降。在3.5 GPa下合成的Co4Sb11.5Te0.5 + 0.25vol%碳纳米管的热电优值（ZT）在773 K下达到1.32，与其他结果相比大大提高。从宏观上讲，我们的样品优异的热电输运性能被认为是高压，掺杂原子和分散的碳纳米管的共同作用。在微观层面上，样品中普遍存在的晶粒尺寸较小、晶格取向无序、位错和可能存在的“纳米点”所产生的丰富晶界对热电性能有改善作用。
Carbon nanotubes (CNTs) were dispersed for the first time in Co4Sb11.5Te0.5 skutterudite bulk materials via a high temperature and high pressure (HTHP) method, and the effects of the content of Te and CNTs on the structure and thermoelectric properties were investigated at different pressures. Compared with other traditional methods, the processing time of the HTHP method was sharply reduced from a few days to half an hour. With increasing temperature, the power factor evidently increases, and the thermal conductivity distinctly declines. The thermoelectric figure of merit (ZT) of the Co4Sb11.5Te0.5 + 0.25 vol% CNTs synthesized at 3.5 GPa reaches 1.32 at 773 K, which is strongly enhanced in comparison to other results. Macroscopically speaking, the excellent thermoelectric transport properties of our samples are considered to be the common effect of high pressure, dopant atoms and dispersed CNTs. On the micro level, abundant grain boundaries produced by the smaller grain size, disorder in the lattice orientation, dislocations and the possible “nanodots” commonly existing in our samples have an improving effect on the thermoelectric performance.
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DOI：
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--
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影响因子：
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