TY - JOUR
T1 - Effect of Ag+ doping and Ag addition on the thermoelectric properties of KSr2Nb5O15
AU - Chen, Qian
AU - Zhang, Ping
AU - Lou, Zhihao
AU - Gong, Lingyun
AU - Cao, Shuyao
AU - Xu, Jie
AU - Kong, Jie
AU - Dashevsky, Zinovi
AU - Yan, Haixue
AU - Gao, Feng
N1 - Funding Information:
This work was financially supported by the China-Poland International Collaboration Fund of National Natural Science Foundation of China ( 51961135301 ), the National Natural Science Foundation of China ( 12074318 , 52072301 ), the International Cooperation Foundation of Shaanxi Province ( 2020 KW-032 ), the Fundamental Research Funds for the Central Universities (No. D5000210722 ), the Research Fund of State Key Laboratory of Solidification Processing, NPU ) (No. 2021-TS-08 ), the Open Fund of State Key Laboratory of New Ceramic and Fine Processing Tsinghua University (No. KFZD202102 ), the ‘ 111’ Project ( B20028 ), and the Natural Science Basic Research Program of Shaanxi Province ( 2022JQ-310 ).
Publisher Copyright:
© 2022 Elsevier Ltd and Techna Group S.r.l.
PY - 2023/1/15
Y1 - 2023/1/15
N2 - The electron and phonon thermal transport behavior of Ag + doped KSr2Nb5O15 were discussed by using the first-principles calculations. The band gap was reduced after Ag+ doping, and the electrons near the Fermi level had stronger transition capability, which effectively increased the carrier concentration and electrical conductivity and reduced the thermal conductivity, thereby improving the ZT of the doped KSr2Nb5O15 from 0.6298 to 0.7214 (1200 K) under ideal conditions. In addition, the solid-state reaction method was used to prepare Ag nanoparticle added KSr2Nb5O15 samples, and their thermoelectric performance was tested. The experimental results and the calculated results showed a good consistent trend in which Ag improved the thermoelectric properties of KSr2Nb5O15. When the amount of addition of nanosized Ag was 20 wt%, the power factor and ZT of the material were the highest at 1073 K, which were 0.228 mW/(K2·m) and 0.1090, respectively. This research shows how to improve the thermoelectric performance of KSr2Nb5O15 ceramics and broaden their temperature range for application.
AB - The electron and phonon thermal transport behavior of Ag + doped KSr2Nb5O15 were discussed by using the first-principles calculations. The band gap was reduced after Ag+ doping, and the electrons near the Fermi level had stronger transition capability, which effectively increased the carrier concentration and electrical conductivity and reduced the thermal conductivity, thereby improving the ZT of the doped KSr2Nb5O15 from 0.6298 to 0.7214 (1200 K) under ideal conditions. In addition, the solid-state reaction method was used to prepare Ag nanoparticle added KSr2Nb5O15 samples, and their thermoelectric performance was tested. The experimental results and the calculated results showed a good consistent trend in which Ag improved the thermoelectric properties of KSr2Nb5O15. When the amount of addition of nanosized Ag was 20 wt%, the power factor and ZT of the material were the highest at 1073 K, which were 0.228 mW/(K2·m) and 0.1090, respectively. This research shows how to improve the thermoelectric performance of KSr2Nb5O15 ceramics and broaden their temperature range for application.
KW - Ag doping
KW - First-principles calculation
KW - KSrNbO
KW - Solid state reaction method
KW - Thermoelectric properties
UR - http://www.scopus.com/inward/record.url?scp=85138160046&partnerID=8YFLogxK
U2 - 10.1016/j.ceramint.2022.09.137
DO - 10.1016/j.ceramint.2022.09.137
M3 - Article
AN - SCOPUS:85138160046
SN - 0272-8842
VL - 49
SP - 1731
EP - 1741
JO - Ceramics International
JF - Ceramics International
IS - 2
ER -