TY - JOUR
T1 - Carrier concentration tuning in thermoelectric thiospinel Cu2CoTi3S8 by oxidative extraction of copper
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
Publisher Copyright:
© 2017 Elsevier Inc.
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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U2 - 10.1016/j.jssc.2017.12.031
DO - 10.1016/j.jssc.2017.12.031
M3 - Article
AN - SCOPUS:85040012936
VL - 259
SP - 5
EP - 10
JO - Journal of Solid State Chemistry
JF - Journal of Solid State Chemistry
SN - 0022-4596
ER -