Cu2Se as Textured Adjuvant for Pb-Doped BiCuSeO Materials Leading to High Thermoelectric Performance

Long Jiang; Lihong Han; Caihong Lu; Shangyu Yang; Yaxu Liu; Haoze Jiang; Yonggao Yan; Xinfeng Tang; Dongwang Yang

doi:10.1021/acsami.0c22861

Cu₂Se as Textured Adjuvant for Pb-Doped BiCuSeO Materials Leading to High Thermoelectric Performance

ACS Appl Mater Interfaces. 2021 Mar 17;13(10):11977-11984. doi: 10.1021/acsami.0c22861. Epub 2021 Mar 8.

Authors

Long Jiang^{1

2

3}, Lihong Han^{1

2

3

4}, Caihong Lu^{1

2

3}, Shangyu Yang^{1

2

3}, Yaxu Liu^{1

2

3}, Haoze Jiang⁵, Yonggao Yan⁶, Xinfeng Tang⁶, Dongwang Yang⁶

Affiliations

¹ 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.
² Shaanxi Key Laboratory for Performance and Structure Safety of Petroleum Tubular Goods and Equipment Materials, Xi'an, Shaanxi 710077, China.
³ Key Laboratory of Petroleum Tubular Goods Engineering, CNPC, Xi'an, Shaanxi 710077, China.
⁴ School of Materials Science and Engineering, Chang'an University, Xi'an, Shaanxi 710064, China.
⁵ LWD Logging Center, China Petroleum Logging Co., Ltd., Xi'an, Shaanxi 710077, China.
⁶ State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, Hubei 430070, China.

PMID: 33685121
DOI: 10.1021/acsami.0c22861

Abstract

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 Cu₂Se 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 ZT value of Bi_0.96Pb_0.04CuSeO-6 mol % Cu₂Se 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.

Keywords: BiCuSeO; Cu2Se; textured adjuvant; texturization; thermoelectric.