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Special Issue:
SPECIAL TOPIC — Recent advances in thermoelectric materials and devices
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| SPECIAL TOPIC—Recent advances in thermoelectric materials and devices |
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Se substitution and micro-nano-scale porosity enhancing thermoelectric Cu2Te |
| Xiaoman Shi(史晓曼)1, Guoyu Wang(王国玉)2,3, Ruifeng Wang(王瑞峰)2,3, Xiaoyuan Zhou(周小元)4, Jingtao Xu(徐静涛)5, Jun Tang(唐军)1,6, Ran Ang(昂然)1,6 |
1. Key Laboratory of Radiation Physics and Technology, Ministry of Education, Institute of Nuclear Science and Technology, Sichuan University, Chengdu 610064, China;
2. Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China;
3. University of Chinese Academy of Sciences, Beijing 100190, China;
4. College of Physics, Chongqing University, Chongqing 401331, China;
5. Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China;
6. Institute of New Energy and Low-Carbon Technology, Sichuan University, Chengdu 610065, China |
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Abstract Binary Cu-based chalcogenide thermoelectric materials have attracted a great deal of attention due to their outstanding physical properties and fascinating phase sequence. However, the relatively low figure of merit zT restricts their practical applications in power generation. A general approach to enhancing zT value is to produce nanostructured grains, while one disadvantage of such a method is the expansion of grain size in heating-up process. Here, we report a prominent improvement of zT in Cu2Te0.2Se0.8, which is several times larger than that of the matrix. This significant enhancement in thermoelectric performance is attributed to the formation of abundant porosity via cold press. These pores with nano-to micrometer size can manipulate phonon transport simultaneously, resulting in an apparent suppression of thermal conductivity. Moreover, the Se substitution triggers a rapid promotion of power factor, which compensates for the reduction of electrical properties due to carriers scattering by pores. Our strategy of porosity engineering by phonon scattering can also be highly applicable in enhancing the performances of other thermoelectric systems.
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Received: 19 December 2017
Revised: 05 February 2018
Accepted manuscript online:
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PACS:
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72.20.Pa
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(Thermoelectric and thermomagnetic effects)
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68.35.bg
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(Semiconductors)
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44.10.+i
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(Heat conduction)
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44.30.+v
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(Heat flow in porous media)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 51771126 and 11774247), the Youth Foundation of Science and Technology Department of Sichuan Province, China (Grant No. 2016JQ0051), Sichuan University Outstanding Young Scholars Research Funding (Grant No. 2015SCU04A20), the World First-Class University Construction Funding, and the Fundamental and Frontier Research Project in Chongqing (Grant No. CSTC2015JCYJBX0026). |
Corresponding Authors:
Jun Tang, Ran Ang
E-mail: rang@scu.edu.cn;tangjun@scu.edu.cn
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Cite this article:
Xiaoman Shi(史晓曼), Guoyu Wang(王国玉), Ruifeng Wang(王瑞峰), Xiaoyuan Zhou(周小元), Jingtao Xu(徐静涛), Jun Tang(唐军), Ran Ang(昂然) Se substitution and micro-nano-scale porosity enhancing thermoelectric Cu2Te 2018 Chin. Phys. B 27 047204
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