Abstract
In this study, nano-sized fullerene C60 powder was sufficiently mixed with Cu2SnSe3 powder by ball milling method, and the C60/Cu2SnSe3 composites were prepared by spark plasma sintering technology. The fullerene C60 distributed uniformly in the form of clusters, and the average cluster size was less than 1 μm. With increasing C60 content, the electrical conductivity of C60/Cu2SnSe3 composites decreased, while the Seebeck coefficient was enhanced. The thermal conductivity of composites decreased significantly, which resulted from the phonon scattering by the C60 clusters located on the grain boundaries of the Cu2SnSe3 matrix. The highest figure of merit ZT of 0.38 was achieved at 700 K for 0.8% C60/Cu2SnSe3 composite.
Highlights
Thermoelectric (TE) materials have attracted increasing worldwide attention due to their potential application in electronic cooling, waste heat recovery, and power generation [1,2,3,4]
Effects of C60 particles on the thermoelectric properties of C60 /Cu2 SnSe3 composites were discussed, and the results are beneficial to the development of Cu2 SnSe3 -based composites with high performance using ball milling (BM)-spark plasma sintering (SPS) technology
The constituent phases of the samples were determined by X‐ray diffractometry (Cu Kα, Rigaku, Rint2000, Tokyo, Japan)
Summary
Thermoelectric (TE) materials have attracted increasing worldwide attention due to their potential application in electronic cooling, waste heat recovery, and power generation [1,2,3,4]. Significant reduction in the lattice conductivity can be achieved via enhanced phonon scattering at grain boundaries or matrix/inclusion interfaces, the electrical conductivity of TE composites decreases, resulting in a marginal improvement of the overall ZT value. Nandihalli, et al reported that the ZT value of C60 /Ni0.05 Mo3 Sb5.4 Te1.6 composites was enhanced in the whole temperature range due to the large decrease of κ L [19] In this contribution, we attempted to introduce the C60 into a Cu2 SnSe3 system and expected to achieve a larger reduction in the thermal conductivity of C60 /Cu2 SnSe3 composites. Effects of C60 particles on the thermoelectric properties of C60 /Cu2 SnSe3 composites were discussed, and the results are beneficial to the development of Cu2 SnSe3 -based composites with high performance using BM-SPS technology
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