1. High thermoelectric properties realized in earth abundant Bi2S3 bulk materials via Se and Cl co-doping in solution synthesis process
- Author
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Yu-Ke Zhu, Jing Feng, Zhen-Hua Ge, Lin Chen, Jun Guo, and Zi-Yuan Wang
- Subjects
Materials science ,Polymers and Plastics ,business.industry ,Mechanical Engineering ,Doping ,Energy conversion efficiency ,Metals and Alloys ,Power factor ,Thermoelectric materials ,Temperature measurement ,Mechanics of Materials ,Electrical resistivity and conductivity ,Seebeck coefficient ,Thermoelectric effect ,Materials Chemistry ,Ceramics and Composites ,Optoelectronics ,business - Abstract
Bi2S3-based alloys are considered promising thermoelectric materials due to their large Seebeck coefficient and low lattice thermal conductivity. However, low electrical conductivity usually leads to poor electrical transport properties, which seriously restricts their further application in thermoelectric refrigeration and/or power generation. In this work, Bi2S3 with high electrical transport properties is synthesized hydrothermally via Se and Cl co-doping. The maximum electrical conductivity value of 483 S cm−1 was obtained for the Bi2S2.4Se0.4Cl0.20 sample at room temperature. The significant improvement of electrical conductivity gives rise to a high average power factor of 411 μW m−1 K−2 during the measuring temperature range and a peak value of 456 μW m−1 K−2 at 673 K. Benefiting from the largely improved electrical transport properties, a superior ZT value of approximately 0.66 and ZTave. of 0.36 were obtained for Bi2S2.4Se0.4Cl0.20, and the theoretically calculated conversion efficiency reached 5.7%. The results indicate that Bi2S3 is a promising candidate for thermoelectric applications at medium temperatures.
- Published
- 2022