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Thermoelectric properties of lower concentration K-doped Ca3Co4O9 ceramics |
| Ya-Nan Li(李亚男)1, Ping Wu(吴平)1, Shi-Ping Zhang(张师平)1, Sen Chen(陈森)1, Dan Yan(闫丹)1, Jin-GuangYang(杨金光)1, Li Wang(王立)2, Xiu-Lan Huai(淮秀兰)3 |
1 Beijing Key Laboratory for Magneto-Photoelectrical Composite and Interface Science, School of Mathematics and Physics, University of Science and Technology Beijing, Beijing 100083, China;
2 School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China;
3 Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China |
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Abstract The tuning of electron and phonon by ion doping is an effective method of improving the performances of thermoelectric materials. A series of lower concentration K-doped Ca3-xKxCo4O9 (x=0, 0.05, 0.10, 0.15) polycrystalline ceramic samples are prepared by combining citrate acid sol-gel method with cold-pressing sintering method. The single-phase compositions and plate-like grain morphologies of all samples are confirmed by x-ray diffraction and field emission scanning electron microscope. The effects of lower concentration K doping on the thermoelectric properties of the material are evaluated systematically at high temperatures (300-1026 K). Low concentration K doping causes electrical conductivity to increase up to 23% with little effect on the Seebeck coefficient. Simultaneously, the thermal conductivity of K-doped sample is lower than that of the undoped sample, and the total thermal conductivity reaches a minimum value of approximately 1.30 W·m-1·K-1, which may be suppressed mainly by the phonon thermal conduction confinement. The dimensionless figure-of-merit ZT of Ca2.95K0.05Co4O9 is close to 0.22 at 1026 K, representing an improvement of about 36% compared with that of Ca3Co4O9, suggesting that lower concentration K-doped Ca3Co4O9 series materials are promising thermoelectric oxides for high-temperature applications.
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Received: 05 February 2018
Revised: 09 March 2018
Accepted manuscript online:
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PACS:
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72.15.Jf
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(Thermoelectric and thermomagnetic effects)
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84.60.Rb
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(Thermoelectric, electrogasdynamic and other direct energy conversion)
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81.05.Je
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(Ceramics and refractories (including borides, carbides, hydrides, nitrides, oxides, and silicides))
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| Fund: Project supported by the National Key R&D Program of China (Grant No.2016YFB0601101) and the National Natural Science Foundation of China (Grant No.51476173). |
Corresponding Authors:
Ping Wu
E-mail: pingwu@sas.ustb.edu.cn
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Cite this article:
Ya-Nan Li(李亚男), Ping Wu(吴平), Shi-Ping Zhang(张师平), Sen Chen(陈森), Dan Yan(闫丹), Jin-GuangYang(杨金光), Li Wang(王立), Xiu-Lan Huai(淮秀兰) Thermoelectric properties of lower concentration K-doped Ca3Co4O9 ceramics 2018 Chin. Phys. B 27 057201
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