Journal of Inorganic Materials ›› 2019, Vol. 34 ›› Issue (3): 328-334.

### Enhanced Thermoelectric Properties of Hydrothermal Synthesized BiCl3/Bi2S3 Composites

WANG Wei1, LUO Shi-Jie1, XIAN Cong1, XIAO Qun1, YANG Yang2, OU Yun3, LIU Yun-Ya1, XIE Shu-Hong4

1. 1. Hunan Provincial Key Laboratory of Thin Film Materials and Devices, School of Materials Science and Engineering, Xiangtan University, Xiangtan 411105, China;
2. Department of Mechanical Engineering, University of Washington, Seattle, WA 98195-2600, USA;
3. Hunan Provincial Key Laboratory of Health Maintenance for Mechanical Equipment, Hunan University of Science and Technology, Xiangtan 411201, China;
4. Key Laboratory of Low Dimensional Materials and Application Technology of Ministry of Education, Xiangtan University, Xiangtan 411105, China;
• Received:2018-06-11 Published:2019-03-20 Online:2019-02-26
• About author:WANG Wei (1988?), male, candidate of PhD. E-mail: yuhong138@163.com
• Supported by:
National Natural Science Foundation of China (11627801, 51772254, 11702092);Scientific Research Fund of Hunan Provincial Education Department (16A202)

Abstract:

Hierarchical spherical Bi2S3 particles with nanorod were synthesized by hydrothermal method, and then BiCl3/Bi2S3 composite powders with different molar ratios were consolidated into bulk samples by spark plasma sintering (SPS) technique. The addition of BiCl3 with appropriate amount not only increased the electrical conductivity, but also decreased the thermal conductivity of Bi2S3. The Bi2S3 sample doped with 0.5mol% BiCl3 shows a maximum electrical conductivity of 45.1 S·cm-1 at 762 K, which is much higher than that of pure Bi2S3 at 762 K (12.9 S·cm-1). The minimum thermal conductivity is 0.31 W·m-1·K-1 for the Bi2S3 sample doped with 0.25mol% BiCl3 at 762 K, which is lower than that of pure Bi2S3 (0.47 W·m-1·K-1)at the same temperature. The maximum ZT value of 0.63 at 762 K was achieved by Bi2S3 doped with 0.25mol% BiCl3, which is almost two times higher than that of pure Bi2S3(0.22).

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