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Effect of carbon nanotubes addition on thermoelectric properties of Ca3Co4O9 ceramics |
| Ya-Nan Li(李亚男)1, Ping Wu(吴平)1,†, Shi-Ping Zhang(张师平)1, Yi-Li Pei(裴艺丽)1, Jin-Guang Yang(杨金光)1, Sen Chen(陈森)1, and Li Wang(王立)2 |
1 Beijing Key Laboratory for MagnetoPhotoelectrical 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 |
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Abstract Increasing the phonon scattering center by adding nanoparticles to thermoelectric materials is an effective method of regulating the thermal conductivity. In this study, a series of Ca$_{3}$Co$_{4}$O$_{9}/x$ wt.% CNTs ($x=0$, 3, 5, 7, 10) polycrystalline ceramic thermoelectric materials by adding carbon nanotubes (CNTs) were prepared with sol-gel method and cold-pressing sintering technology. The results of x-ray diffraction and field emission scanning electron microscopy show that the materials have a single-phase structure with high orientation and sheet like microstructure. The effect of adding carbon nanotubes to the thermoelectric properties of Ca$_{3}$Co$_{4}$O$_{9}$ was systematically measured. The test results of thermoelectric properties show that the addition of carbon nanotubes reduces the electrical conductivity and Seebeck coefficient of the material. Nevertheless, the thermal conductivity of the samples with carbon nanotubes addition is lower than that of the samples without carbon nanotubes. At 625 K, the thermal conductivity of Ca$_{3}$Co$_{4}$O$_{9}$/10 wt.% CNTs sample is reduced to 0.408 W$\cdot$m$^{-1}\cdot$K$^{-1}$, which is about 73% lower than that of the original sample. When the three parameters are coupled, the figure of merit of Ca$_{3}$Co$_{4}$O$_{9}$/3 wt.% CNTs sample reaches 0.052, which is 29% higher than that of the original sample. This shows that an appropriate amount of carbon nanotubes addition can reduce the thermal conductivity of Ca$_{3}$Co$_{4}$O$_{9}$ ceramic samples and improve their thermoelectric properties.
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Received: 02 October 2021
Revised: 12 January 2022
Accepted manuscript online: 17 January 2022
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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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74.25.fc
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(Electric and thermal conductivity)
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| Fund: This work was supported by the National Natural Science Foundation of China (Grant No. 51836009). |
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), Yi-Li Pei(裴艺丽), Jin-Guang Yang(杨金光), Sen Chen(陈森), and Li Wang(王立) Effect of carbon nanotubes addition on thermoelectric properties of Ca3Co4O9 ceramics 2022 Chin. Phys. B 31 047203
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