Enhancements of thermoelectric performance in n-type Bi2Te3-based nanocomposites through incorporating 2D Mxenes |
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| Affiliation: | 1. State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, China;2. Jiangxi Guo Chuang Industrial Park Development Co., Ltd., Ganzhou 341000, China;1. Key Laboratory of Artificial Micro-and Nano-structures of Ministry of Education and School of Physics and Technology, Wuhan University, Wuhan 430072, China;2. The Institute of Technological Sciences, Wuhan University, Wuhan 430072, China;3. Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China;1. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China;2. Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology, Wuhan 430074, China;3. School of Materials Science and Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, China;4. Laboratory of Magnetic and Electric Functional Materials and the Applications, The Key Laboratory of Shanxi Province, Taiyuan 030024, China;1. Institute for Superconducting and Electronic Materials, Australian Institute for Innovative Materials, University of Wollongong, North Wollongong, NSW 2500, Australia;2. Australian Research Council Centre of Excellence in Future Low-Energy Electronics Technologies, University of Wollongong, Australia;3. Electron Microscopy Centre, Innovation Campus, University of Wollongong, North Wollongong, NSW 2500, Australia;4. Intelligent Polymer Research Institute, Australian Institute for Innovative Materials, University of Wollongong, North Wollongong, NSW 2500, Australia;1. School of Materials Science and Engineering, Sichuan University, Chengdu, 610064, China;2. School of Mechanical and Mining Engineering, The University of Queensland, St Lucia, Queensland, 4072, Australia;3. Centre for Microscopy and Microanalysis, The University of Queensland, St Lucia, Queensland, 4072, Australia;4. Key Laboratory of Radiation Physics and Technology, Ministry of Education, Institute of Nuclear Science and Technology, Sichuan University, Chengdu, 610064, China;5. Centre for Future Materials, University of Southern Queensland, Springfield Central, Queensland, 4300, Australia |
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| Abstract: | Bi2Te2.7Se0.3 compound has been considered as an efficient n-type room-temperature thermoelectric (TE) material. However, the large-scale applications for low-quality energy harvesting were limited due to its low energy-conversion efficiency. We demonstrate that TE performance of Bi2Te2.7Se0.3 system is optimized by 2D Ti3C2Tx additive. Here, a 43% reduction of electrical resistivity is obtained for the nanocomposites at 380 K, originating from the increased carrier concentration. Consequently, the g = 0.1 sample shows a maximum power factor of 1.49 Wmm?1K?2. Meanwhile, the lattice thermal conductivity for nanocomposite samples is reduced from 0.77 to 0.41 Wm?1K?1 at 380 K, due to the enhanced phonon scattering induced by the interfaces between Ti3C2Tx nanosheets and Bi2Te2.7Se0.3 matrix. Therefore, a peak ZT of 0.68 is achieved at 380 K for Bi2Te2.7Se0.3/0.1 wt% Ti3C2Tx, which is enhanced by 48% compared with pristine sample. This work provides a new route for optimizing TE performance of Bi2Te2.7Se0.3 materials. |
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| Keywords: | Thermoelectric 2D Mxenes Nanocomposites Interface barrier |
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