水热合成BiCl3/Bi2S3复合材料的热电性能

doi:10.15541/jim20180261

无机材料学报 ›› 2019, Vol. 34 ›› Issue (3): 328-334.DOI: 10.15541/jim20180261

水热合成BiCl₃/Bi₂S₃复合材料的热电性能

王伟¹, 罗世阶¹, 鲜聪¹, 肖群¹, 杨洋², 欧云³, 刘运牙¹, 谢淑红⁴

1. 湘潭大学材料科学与工程学院湖南省薄膜材料与器件重点实验室, 湘潭 411105;
2. 华盛顿大学机械工程系, 西雅图, 98195, 美国;
3. 湖南科技大学机械设备健康维护湖南省重点实验室, 湘潭 411201;
4. 湘潭大学低维材料与应用技术教育部重点实验室, 湘潭 411105

收稿日期:2018-06-11 出版日期:2019-03-20 网络出版日期:2019-02-26
作者简介:WANG Wei. E-mail: yuhong138@163.com

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. 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)

摘要/Abstract

摘要：

采用水热合成法制备了由纳米棒组成的微米级球形Bi₂S₃颗粒, 然后通过放电等离子烧结技术(SPS)将不同摩尔比例的BiCl₃/Bi₂S₃复合粉末制备成块体。加入适量的BiCl₃不仅提高了Bi₂S₃样品的导电率, 而且降低了其热导率。Bi₂S₃复合0.5mol%BiCl₃的样品在762 K电导率最大, 达到45.1 S·cm^-1, 远高于此温度下纯Bi₂S₃样品的电导率(12.9 S·cm^-1)。Bi₂S₃复合0.25mol% BiCl₃的样品在762 K时热导率最低, 为0.31 W·m^-1·K^-1, 低于同一温度下纯Bi₂S₃的0.47 W·m^-1·K^-1。在762 K下, Bi₂S₃复合0.25mol% BiCl₃的样品获得最大ZT值(0.63), 比纯Bi₂S₃样品(0.22)提高了大约2倍。

关键词: Bi₂S₃, 水热法, 球形颗粒, 放电等离子烧结, 热电

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 Bi₂S₃at 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).

Key words: Bi₂S₃, hydrothermal method, spherical particle, spark plasma sintering, thermoelectric

中图分类号:

TB34

王伟, 罗世阶, 鲜聪, 肖群, 杨洋, 欧云, 刘运牙, 谢淑红. 水热合成BiCl₃/Bi₂S₃复合材料的热电性能[J]. 无机材料学报, 2019, 34(3): 328-334.

WANG Wei, LUO Shi-Jie, XIAN Cong, XIAO Qun, YANG Yang, OU Yun, LIU Yun-Ya, XIE Shu-Hong. Enhanced Thermoelectric Properties of Hydrothermal Synthesized BiCl₃/Bi₂S₃ Composites[J]. Journal of Inorganic Materials, 2019, 34(3): 328-334.

图/表 6

Fig. 1 XRD patterns (a) and the enlarged patterns of 2θ in the range of 24°-32.5°(b) with peaks of crystal plane (211) in the inset for BiCl3/Bi2S3 powders with different xmol% (x= 0, 0.25, 0.5, and 1.0) BiCl3

Fig. 2 SEM images of Bi2S3 powders (a), fractured surfaces of SPSed samples of Bi2S3 doped with xmol% BiCl3 ((b) x=0, (c) x=0.25, (d) x=0.5, (e) x=1.0); TEM images of sintered samples of Bi2S3 doped with xmol% BiCl3 ((f) x=0, (h) x=1.0); HRTEM image of Bi2S3 powder after SPS (g)

Fig. 3 SEM image of the fractured surfaces of Bi2S3 doped with 1.0mol% BiCl3 bulk after SPS (a), corresponding elemental mappings of Bi, S and Cl (b-d)

Table 1 Thermoelectric performance of BiCl3/Bi2S3 samples at 762 K

Sample	ρ/%	S/(µV·K^-1)	σ/(S·cm^-1)	PF/(μW·m^-1·K^-2)	κ/(W·m^-1·K^-1)	ZT
Bi₂S₃	89%	-326.0	12.9	136.9	0.47	0.22
Bi₂S₃+0.25% BiCl₃	90%	-304.0	27.6	255.0	0.31	0.63
Bi₂S₃+0.5% BiCl₃	89%	-279.0	45.1	350.2	0.58	0.46
Bi₂S₃+1.0% BiCl₃	92%	-273.5	25.4	189.7	0.49	0.30

Fig. 4 Temperature dependence of thermoelectric performances for BiCl3/Bi2S3 composite samples (a) Seebeck coefficient; (b) Electrical conductivity; (c) Power factor; (d) Total thermal conductivity; (e) Lattice thermal conductivity; (f) Figure of merit (ZT)

Table 2 Carrier concentration of BiCl3/Bi2S3 samples at room temperature

Sample	Bi₂S₃	Bi₂S₃+0.25% BiCl₃	Bi₂S₃+0.5% BiCl₃	Bi₂S₃+1.0% BiCl₃
Carrierconcentration/(×10¹⁵, cm^-3)	1.82	2.13	4.31	6.83

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水热合成BiCl₃/Bi₂S₃复合材料的热电性能

Enhanced Thermoelectric Properties of Hydrothermal Synthesized BiCl₃/Bi₂S₃ Composites

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