Thermoelectric properties of superionic Li 0.11 Cu 1.89 S compound.

Copper sulfide is a multifunctional material. Copper sulfides are known to be used in photo-electric converters, in plasmonics, in active electrodes of batteries and supercapacitors, etc. The excellent thermoelectric properties of copper sulfide are well-known too. The purpose of this study is to investigate the thermoelectric performance of nanocomposite copper sulfide contained monoclinic Cu ₂ S and tetragonal Cu _1.96 S phase. According to scanning electron microscopy, the average particle size of the synthesized powder was about 373 nm. The Li _0.11 Cu _1.89 S sample showed an electronic conductivity of 50-180 S/cm, a Seebeck coefficient of 0.04-0.31 mV/K in the range of 300-700 K, and high power factor 5.8 μW K ^-2 cm ^-1 at 672 K. Total thermal conductivity decreases with increasing temperature from 0.61 to 0.22 W∙K ^-1 m ^-1 in the range of 300-700 K. Such low thermal conductivity and high power factor made it possible to achieve an extremely high dimensionless thermoelectric figure of merit ZT = 1.76 at 672 K, which allows to consider the Li _0.11 Cu _1.89 S alloy as a promising thermoelectric material.
Competing Interests: The authors declare the following financial interests/personal relationships which may be considered as potential competing interests: Kubenova Marzhan reports financial support was provided by L N Gumilyov Eurasian National University. Kubenova Marzhan reports a relationship with L N Gumilyov Eurasian 10.13039/100018366National University that includes: employment and funding grants. Kubenova Marzhan has patent No pending to No. The authors declare that there are no competing interests or financial conflicts related to this research. All funding sources have been acknowledged in the manuscript. The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper. If there are other authors, they declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
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