Europium (III) doped bismuth telluride decorated on carbon-based materials for enhancing thermoelectric performance |
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| Affiliation: | 1. Composites and Nano-Structured Materials Research Department, Advanced Technology and New Materials Research Institute, City of Scientific Research and Technological Applications, New Borg El-Arab City, P.O: 21934, Alexandria, Egypt;2. Chemistry Department, Faculty of Science, Alexandria University, P.O: 21568, Alexandria, Egypt;1. Department of Ceramic Engineering, IIT BHU, Varanasi, 201005, India;2. Department of Mechanical Engineering, IIT BHU, Varanasi, 201005, India;3. Department of Chemistry, Bar-Ilan Institute for Nanotechnology and Advanced Materials (BINA), Bar-Ilan University, 52900, Ramat Gan, Israel;1. Key Laboratory of Automobile Materials, Ministry of Education and Department of Materials Science and Engineering, Jilin University, Renmin Street NO. 5988, Changchun, Jilin Province, 130025, PR China;2. School of Mechanical and Aerospace Engineering, Jilin University, Renmin Street NO. 5988, Changchun, Jilin Province, 130025, PR China;3. School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang, 212003, PR China;1. College of Chemistry and Chemical Engineering, Shaanxi Key Laboratory of Chemical Reaction Engineering, Yan''an University, Yan''an, 716000, China;2. MOE Key Laboratory of Material Physics and Chemistry Under Extraordinary, School of Physical Science and Technology, Northwestern Polytechnical University, Xi''an, 10072, China;1. Chongqing Key Laboratory of Inorganic Special Functional Materials, College of Chemistry and Chemical Engineering, Yangtze Normal University, Chongqing, 408100, PR China;2. Chongqing Sports Medicine Center, Department of Orthopedic Surgery, Southwest Hospital, The Third Military Medical University, Chongqing, 400038, People''s Republic of China;3. School of Robot Engineering, Yangtze Normal University, Chongqing, 408100, PR China;4. MOE Key Laboratory of Low-grade Energy Utilization Technologies and Systems, CQU-NUS Renewable Energy Materials & Devices Joint Laboratory, School of Energy & Power Engineering, Chongqing University, Chongqing, 400044, China;1. School of Science, Xi''an University of Posts and Telecommunications, Xi''an, 710121, China;2. School of Materials and Chemical Engineering, Xi''an Technological University, Xi''an, 710021, China |
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| Abstract: | Scalable synthetic approach for superior performance of thermoelectric (TE) materials is a crucial step for the TE technology progress. Herein, reduced graphene oxide (RGO), carbon nitride (g-C 3N4) and europium (Eu) are utilized as additives to bismuth telluride (Bi2Te3) matrix to prepare various novel nanocomposites (NCs): (RGO@Bi1.8Te3Eu0.2) and (RGO-g-C3N4@Bi1.8Te3Eu0.2) with an enhanced TE performance. The novel NCs were synthesized via solvothermal method, physiochemically characterized and consolidated into pellets of 1 mm thickness to measure their TE properties. The new additives potentially affected the physicochemical and TE properties of Bi2Te3. Nanostructured hexagonal nanoplatelets with 12.5 nm thickness were observed by scanning and transmission electron microscopy (SEM and TEM) of the synthesized Bi2Te3. This thickness shrinked to 5.7 and 5.2 nm upon the formation of (RGO@Bi1.8Te3Eu0.2) and (RGO-g-C3N4@Bi1.8Te3Eu0.2) NCs, respectively. Energy dispersive X-ray Spectroscopy (EDS) of NCs proved the existence of Bi, Te, C, Eu and N atoms. Raman and Fourier-transform infrared (FT-IR) spectra confirmed the NC formation that led to narrowing the energy band gap of Bi2Te3 as displayed by UV–Vis spectra. Brunauer–Emmett–Teller showed specific surface area expansion of Bi2Te3 from 6.78 to 19.00 and 16.75 m2g-1 of (RGO@Bi1.8Te3Eu0.2) and (RGO-g-C3N4@Bi1.8Te3Eu0.2) NCs, respectively. The electrical conductivity of Bi2Te3 rose by 56 and 69 times, whereas its thermal conductivity significantly dropped by 1.6 and 1.7 times upon (RGO@Bi1.8Te3Eu0.2) and (RGO-g-C3N4@Bi1.8Te3Eu0.2) NCs formation. Owing to extra channels of carrier transfer and phonon scattering induced by NCs heterointerfaces. Novel combination of carbon-based materials and Eu with Bi2Te3 matrix boosts its TE performance resulting in a worthy candidate for power generation applications at room-temperature. |
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| Keywords: | Thermoelectric Nanocomposites Thermal and electrical conductivity |
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