多孔介导的高性能热电材料
Porosity-mediated High-performance Thermoelectric Materials
摘要：
孔隙率是否能有效地提高热电性能仍是一个悬而未决的问题。在本文中，我们报告了热电性能可以通过在n型Mg3.225Mn0.025Sb1.5Bi0.49Te0.01中产生孔隙来显著增强，在323 K下ZT为~0.9，在723 K下为~1.6，使得平均ZT高得多以获得更好的性能。考虑到这样的ZT值与n型Bi 2 Te 3在该温度下的最佳ZT相当，在室温下的大的改善是显著的。这种增强主要来自于提高的电迁移率和多尺度声子散射，特别是来自于多孔结构中分散良好的铋纳米沉淀。我们进一步将这种方法扩展到其他热电材料，如半Heuslers Nb0.56V0.24Ti0.2FeSb和Hf0.25Zr0.75NiSn0.99Sb0.01和Bi0.5Sb1.5Te3，显示出类似的改进，进一步推进热电材料的应用。
英文摘要：
Whether porosity can effectively improve thermoelectric performance is still an open question. Herein we report that thermoelectric performance can be significantly enhanced by creating porosity in n-type Mg3.225Mn0.025Sb1.5Bi0.49Te0.01, with a ZT of ~0.9 at 323 K and ~1.6 at 723 K, making the average ZT much higher for better performance. The large improvement at room temperature is significant considering that such a ZT value is comparable to the best ZT at this temperature in n-type Bi2Te3. The enhancement was mainly from the improved electrical mobility and multi-scale phonon scattering, particularly from the well-dispersed bismuth nano-precipitates in the porous structure. We further extend this approach to other thermoelectric materials such as half-Heuslers Nb0.56V0.24Ti0.2FeSb and Hf0.25Zr0.75NiSn0.99Sb0.01 and Bi0.5Sb1.5Te3 showing similar improvements, further advancing thermoelectric materials for applications.
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