Enhanced Thermoelectric Properties of Cu 3 SbSe 3 -Based Composites with Inclusion Phases

Rui Liu, Guangkun Ren, Xing Tan, Yuanhua Lin and Cewen Nan
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Rui Liu: State Key Laboratory of New Ceramics and Fine Processing, Tsinghua University, Beijing 100084, China
Guangkun Ren: State Key Laboratory of New Ceramics and Fine Processing, Tsinghua University, Beijing 100084, China
Xing Tan: State Key Laboratory of New Ceramics and Fine Processing, Tsinghua University, Beijing 100084, China
Yuanhua Lin: State Key Laboratory of New Ceramics and Fine Processing, Tsinghua University, Beijing 100084, China
Cewen Nan: State Key Laboratory of New Ceramics and Fine Processing, Tsinghua University, Beijing 100084, China

Energies, 2016, vol. 9, issue 10, 1-7

Abstract: Cu 3 SbSe 3 -based composites have been prepared by self-propagating high-temperature synthesis (SHS) combined with spark plasma sintering (SPS) technology. Phase composition and microstructure analysis indicate that the obtained samples are mainly composed of Cu 3 SbSe 3 phase and CuSbSe 2 /Cu 2? x Se secondary phases. Our results show that the existence of Cu 2? x Se phase can clearly enhance the electrical conductivity of the composites (~16 S/cm), which is 2.5 times higher than the pure phase. The thermal conductivity can remain at about 0.30 W·m ?1 ·K ?1 at 653 K. A maximum ZT (defined as ZT = S 2 ? ? /?, where S , ?, ? , ? are the Seebeck coefficient, electrical conductivity, absolute temperature and total thermal conductivity) of the sample SPS 633 can be 0.42 at 653 K, which is 60% higher than the previously reported values. Our results indicate that the composite structure is an effective method to enhance the performance of Cu 3 SbSe 3 .

Keywords: Cu 3 SbSe 3; Cu 2? x Se; electrical conductivity; spark plasma sintering (SPS) (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2016
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