Enhanced Thermoelectric Properties of Hydrothermal Synthesized BiCl3/Bi2S3 Composites

doi:10.15541/jim20180261

Abstract

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

CLC Number:

TB34

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.

Figures/Tables 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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Enhanced Thermoelectric Properties of Hydrothermal Synthesized BiCl₃/Bi₂S₃ Composites

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