Enhancing the thermoelectric properties of powder metallurgically produced BiSbTe alloy through feasible electroless surface coating method |
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| Affiliation: | 1. Department of Materials Science & Engineering, Chungnam National University, Daejeon 34134, Republic of Korea;2. Future Convergence Research Division, Korea Institute of Science and Technology, Seoul 02792, Republic of Korea;3. Department of Nano Fusion Technology, Pusan National University, Miryang 50463, Republic of Korea;4. Mechanical and Aerospace Engineering, University of California at San Diego, La Jolla, CA 92093, United States;1. Department of Materials Science and Engineering, Chungnam National University, Daejeon 34134, Republic of Korea;2. Center for Biomaterials, Biomedical Research Institute, Korea Institute of Science and Technology, Seoul 02792, Republic of Korea;3. Department of Orthopedic Surgery, ASAN Medical Center, Seoul 05505, Republic of Korea;4. Department of Nanofusion Technology, Pusan National University, Miryang 50463, Republic of Korea |
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| Abstract: | The powder metallurgical techniques capable of powder mass production but lacks in achieving high zT. Therefore, to improve zT, electroless surface coating was performed on water atomized Bi0.5Sb1.5Te3 (BST) powder and stimulated their conducting nature. Surface chemical composition studies displays fine elemental coating on the BST powders and remarkably, the Seebeck coefficient increased till 450 K. The surface coated bulk sample shows greatly improved power factor about ~45% higher than uncoated sample. Indeed, at high temperature we obtained reduced lattice thermal conductivity which confirms the remarkable suppression of bipolar thermal conductivity. Consequently, a maximum zT of 1.16 at 400 K achieved by coated samples which is ~102% enhancement compared to original BST. Also, we attained high average zT of ~0.99 which helps in employing thermoelectric devices across wide temperature. Therefore, electroless surface coating could be a feasible method for improving the properties of mass-produced BST powder. |
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| Keywords: | Electroless plating Supressing bipolar conduction Mass production |
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