High thermoelectric performance from high carrier mobility and reduced lattice thermal conductivity in Ba, Yb double-filled Skutterudites
High thermoelectric performance from high carrier mobility and reduced lattice thermal conductivity in Ba, Yb double-filled Skutterudites
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Ba、Yb 双填充方钴矿中的高载流子迁移率和降低的晶格热导率带来高热电性能
DOI：
10.1016/j.mtphys.2019.03.001
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发表时间：
2019-03
影响因子：
11.5
通讯作者：
Jiehe Sui
中科院分区：
文献类型：
--
作者：
D;an Qin;Bo Cui;X. Meng;P. Qin;L. Xie;Qian Zhang;W. Liu;Jian Cao;Wei Cai;Jiehe Sui
摘要在我们以前的工作中，液相压缩法制备的Yb单填充Skutterudites中，具有密集位错阵列的半共格小角度晶界被证实是改善其热电性能的有效途径。已知具有不同振动频率的填料可以散射更宽的声子谱，导致晶格热导率进一步降低。因此，在液相压制法的基础上，成功地合成了Ba，Yb双填充方钴矿。Ba、Yb双填充和液相压缩方法协同优化载流子浓度并降低晶格热导率，从而在773 K时获得57μWcm− 1 K −2的超高PF，在823 K时获得出色的热电优值ZT= 1.53。相应地，假设腿长为2 mm，热侧温度Th= 800 K，冷侧温度Tc= 300 K，通过计算可以获得高的理论输出功率密度<$15.6Wcm-2和腿效率<$14%。这项工作强调，获得的方钴矿在利用中等温度范围的热源从废热中获取电力方面显示出巨大的前景。
Abstract The semicoherent low-angle grain boundaries with dense dislocation arrays have been confirmed as an effective way to improve the thermoelectric properties for Yb single-filled Skutterudites using liquid-phase compaction method in our previous work. It is known that fillers with different rattling frequencies can scatter a wider spectrum of phonons, leading to further reduced lattice thermal conductivity. Thus, on the basis of liquid-phase compaction method, Ba, Yb double-filled Skutterudites were successfully synthesized. Ba, Yb double filling and liquid-phase compaction method synergistically optimize carrier concentration and reduce lattice thermal conductivity, resulting in exceptional high PF of 57μWcm−1K−2 at 773K and excellent thermoelectric figure of merit ZT=1.53at 823K. Correspondingly, the high theoretical output power density ∼15.6Wcm−2 and leg efficiency ≈14% can be obtained by calculation assuming the leg length of 2mm, hot-side temperature Th=800K, and cold-side temperature Tc=300K. This work highlights that the obtained Skutterudites display great promise for harvesting electricity from waste heat with heat source at the medium temperature range.
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