Controlling Precipitation and Dopant Effects To Achieve Promising Thermoelectric Performance in CaTiO3
Controlling Precipitation and Dopant Effects To Achieve Promising Thermoelectric Performance in CaTiO3
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DOI：
10.1021/acsaem.3c01111
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发表时间：
2023-08
影响因子：
6.4
通讯作者：
Jianbo Li;Quanwei Jiang;Zhen Tian;Huijun Kang;Zongning Chen;E. Guo;Z. Cao;Tongmin Wang
中科院分区：
文献类型：
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作者：
Jianbo Li;Quanwei Jiang;Zhen Tian;Huijun Kang;Zongning Chen;E. Guo;Z. Cao;Tongmin Wang
操纵微结构对于控制热和电荷的传输是相当重要的。其中，Nb的加入控制了CaTiO_3的微观结构。Nb在基质中具有双重作用，既是掺杂剂，提供额外的电子，又是晶格中的声子散射体。此外，它还在Nb掺杂的CaTiO_3基质中以第二相的形式析出。通过这种方法，我们实现了功率因数的显著提高，在1031K时，功率因数从原始CaTiO3中的2.81μW cm-1K-2增加到CaTi0.85Nb0.15O3中的7.67μW cm-1K-2。此外，我们还观察到在相同温度下，晶格热导率从原始CaTiO3中的2.61Wm-1K-1降低到CaTi0.85Nb0.15O3中的2.46Wm-1K-1。结果，在总体上实现了值得注意的180%的改进。值得注意的是，我们工作的CaTi0.9Nb0.1O3在1031K时的zT值比现有文献报道的值高出88%。这项工作为通过析出金属夹杂物来优化CaTiO3基材料的热电性能提供了参考。
Manipulating microstructures is of considerable importance for controlling the transport of heat and charge. Herein, the microstructure of CaTiO3was controlled by adding Nb. Nb serves a dual purpose in the matrix by acting as a dopant, providing extra electrons, and as a phonon scatterer in the lattice. Additionally, it precipitates as a second phase in the Nb-doped CaTiO3matrix. Through this approach, we achieved significant enhancements in the power factor, which increased from 2.81 μW cm–1K–2in pristine CaTiO3to 7.67 μW cm–1K–2in CaTi0.85Nb0.15O3at 1031 K. Additionally, we observed a reduction in the lattice thermal conductivity from 2.61 W m–1K–1in pristine CaTiO3to 2.46 W m–1K–1in CaTi0.85Nb0.15O3at the same temperature. As a result, a noteworthy 180% improvement in the overallzTwas achieved. Remarkably, thezTvalue of CaTi0.9Nb0.1O3in our work was found to be 88% higher than the values reported in the existing literature at 1031 K. This work provides a reference for optimizing the thermoelectric properties of CaTiO3-based materials by precipitating metal inclusions.