Carrier concentration tuning in thermoelectric thiospinel Cu2CoTi3S8 by oxidative extraction of copper

Katsuaki Hashikuni; Koichiro Suekuni; Kosuke Watanabe; Yohan Bouyrie; Michihiro Ohta; Michitaka Ohtaki; Toshiro Takabatake

doi:10.1016/j.jssc.2017.12.031

Carrier concentration tuning in thermoelectric thiospinel Cu₂CoTi₃S₈ by oxidative extraction of copper

Katsuaki Hashikuni, Koichiro Suekuni, Kosuke Watanabe, Yohan Bouyrie, Michihiro Ohta, Michitaka Ohtaki, Toshiro Takabatake

Functional Materials Science

Research output: Contribution to journal › Article › peer-review

7 Citations (Scopus)

Abstract

We report a method for carrier concentration tuning in the thermoelectric thiospinel Cu₂CoTi₃S₈, which exhibits an n-type metallic character and a high power factor. An oxidative Cu extraction treatment produced Cu defects, resulting in Cu_2−xCoTi₃S₈ up to x = 0.62. The electron carrier concentration was effectively reduced by this treatment, leading to the decrease in power factor, whereas the electronic contribution to the thermal conductivity was suppressed. As a result, the dimensionless figure of merit ZT remained unchanged as 0.2 at 670 K in the whole range of x ≤ 0.62. The oxidative Cu extraction described in this paper offers an opportunity to tune the electron carrier concentration for Cu-containing thermoelectric materials.

Original language	English
Pages (from-to)	5-10
Number of pages	6
Journal	Journal of Solid State Chemistry
Volume	259
DOIs	https://doi.org/10.1016/j.jssc.2017.12.031
Publication status	Published - Mar 2018

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Condensed Matter Physics
Physical and Theoretical Chemistry
Inorganic Chemistry
Materials Chemistry

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Carrier concentration tuning in thermoelectric thiospinel Cu₂CoTi₃S₈ by oxidative extraction of copper. / Hashikuni, Katsuaki; Suekuni, Koichiro; Watanabe, Kosuke; Bouyrie, Yohan; Ohta, Michihiro; Ohtaki, Michitaka; Takabatake, Toshiro.

In: Journal of Solid State Chemistry, Vol. 259, 03.2018, p. 5-10.

Research output: Contribution to journal › Article › peer-review

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title = "Carrier concentration tuning in thermoelectric thiospinel Cu2CoTi3S8 by oxidative extraction of copper",

abstract = "We report a method for carrier concentration tuning in the thermoelectric thiospinel Cu2CoTi3S8, which exhibits an n-type metallic character and a high power factor. An oxidative Cu extraction treatment produced Cu defects, resulting in Cu2−xCoTi3S8 up to x = 0.62. The electron carrier concentration was effectively reduced by this treatment, leading to the decrease in power factor, whereas the electronic contribution to the thermal conductivity was suppressed. As a result, the dimensionless figure of merit ZT remained unchanged as 0.2 at 670 K in the whole range of x ≤ 0.62. The oxidative Cu extraction described in this paper offers an opportunity to tune the electron carrier concentration for Cu-containing thermoelectric materials.",

author = "Katsuaki Hashikuni and Koichiro Suekuni and Kosuke Watanabe and Yohan Bouyrie and Michihiro Ohta and Michitaka Ohtaki and Toshiro Takabatake",

note = "Funding Information: We thank Y. Shibata for the EPMA performed at the Natural Science Center for Basic Research and Development, Hiroshima University and Mr. Atsushi Yamamoto for supporting the electrical and thermal transport measurements at Research Institute for Energy Conservation, National Institute of Advanced Industrial Science and Technology (AIST). This work was supported financially by JSPS KAKENHI Grant No. JP17H04951 (K. S.), grant from the International Joint Research Program for Innovative Energy Technology funded by METI, and CREST, JST , Grant No. JPMJCR16Q6 , Japan. Appendix A ",

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AU - Hashikuni, Katsuaki

AU - Suekuni, Koichiro

AU - Watanabe, Kosuke

AU - Bouyrie, Yohan

AU - Ohta, Michihiro

AU - Ohtaki, Michitaka

AU - Takabatake, Toshiro

N1 - Funding Information: We thank Y. Shibata for the EPMA performed at the Natural Science Center for Basic Research and Development, Hiroshima University and Mr. Atsushi Yamamoto for supporting the electrical and thermal transport measurements at Research Institute for Energy Conservation, National Institute of Advanced Industrial Science and Technology (AIST). This work was supported financially by JSPS KAKENHI Grant No. JP17H04951 (K. S.), grant from the International Joint Research Program for Innovative Energy Technology funded by METI, and CREST, JST , Grant No. JPMJCR16Q6 , Japan. Appendix A

PY - 2018/3

Y1 - 2018/3

N2 - We report a method for carrier concentration tuning in the thermoelectric thiospinel Cu2CoTi3S8, which exhibits an n-type metallic character and a high power factor. An oxidative Cu extraction treatment produced Cu defects, resulting in Cu2−xCoTi3S8 up to x = 0.62. The electron carrier concentration was effectively reduced by this treatment, leading to the decrease in power factor, whereas the electronic contribution to the thermal conductivity was suppressed. As a result, the dimensionless figure of merit ZT remained unchanged as 0.2 at 670 K in the whole range of x ≤ 0.62. The oxidative Cu extraction described in this paper offers an opportunity to tune the electron carrier concentration for Cu-containing thermoelectric materials.

AB - We report a method for carrier concentration tuning in the thermoelectric thiospinel Cu2CoTi3S8, which exhibits an n-type metallic character and a high power factor. An oxidative Cu extraction treatment produced Cu defects, resulting in Cu2−xCoTi3S8 up to x = 0.62. The electron carrier concentration was effectively reduced by this treatment, leading to the decrease in power factor, whereas the electronic contribution to the thermal conductivity was suppressed. As a result, the dimensionless figure of merit ZT remained unchanged as 0.2 at 670 K in the whole range of x ≤ 0.62. The oxidative Cu extraction described in this paper offers an opportunity to tune the electron carrier concentration for Cu-containing thermoelectric materials.

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