Jiang Long, Han Lihong, Lu Caihong, Yang Shangyu, Liu Yaxu, Jiang Haoze, Yan Yonggao, Tang Xinfeng, Yang Dongwang
State Key Laboratory for Performance and Structure Safety of Petroleum Tubular Goods and Equipment Materials, CNPC Tubular Goods Research Institute, Xi'an, Shaanxi 710077, China.
Shaanxi Key Laboratory for Performance and Structure Safety of Petroleum Tubular Goods and Equipment Materials, Xi'an, Shaanxi 710077, China.
ACS Appl Mater Interfaces. 2021 Mar 17;13(10):11977-11984. doi: 10.1021/acsami.0c22861. Epub 2021 Mar 8.
Exploring the origin of intrinsic low thermal conductivity in BiCuSeO is of great significance for searching new oxide thermoelectric (TE) materials. In addition, from the perspective of material preparation, it is of great value to further develop the TE performance optimization strategy of BiCuSeO-based materials. In this work, the low-temperature TE transport properties of Pb-doped BiCuSeO-based materials are investigated. It is found that Pb doping can greatly optimize the carrier concentration, soften the lattice, and reduce the lattice thermal conductivity. The addition of CuSe significantly enhanced the grain texture and then increased the interface concentration parallel to the pressure direction in the sintering process, which further reduced the lattice thermal conductivity of the material. Finally, the value of BiPbCuSeO-6 mol % CuSe bulk material is as high as 0.85 at 840 K. This provides important guidance to improve the properties of TE materials via interface engineering.
探索BiCuSeO中本征低热导率的起源对于寻找新型氧化物热电（TE）材料具有重要意义。此外，从材料制备的角度来看，进一步开发基于BiCuSeO的材料的TE性能优化策略具有很大价值。在这项工作中，研究了Pb掺杂的BiCuSeO基材料的低温TE输运性质。发现Pb掺杂可以极大地优化载流子浓度，软化晶格，并降低晶格热导率。CuSe的添加显著增强了晶粒织构，进而在烧结过程中增加了平行于压力方向的界面浓度，这进一步降低了材料的晶格热导率。最后，BiPbCuSeO-6 mol% CuSe块状材料在840 K时的 值高达0.85。这为通过界面工程改善TE材料的性能提供了重要指导。
