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Prof. Jing-Feng Li’s group publishes article in Advance Materials, reporting an unconventional melt-centrifugation technique to enhance the thermoelectric performance of p-type (Bi,Sb)2Te3
On July 8th, an international team led by Jing-Feng Li, professor from the School of Materials Science and Engineering at Tsinghua University, G. Jeffrey Snyder and Vinayak P. Dravid, professors at Northwestern University in U.S., published their collaborative work as an article in Advanced Materials. This research paper, entitled “Melt-centrifuged (Bi,Sb)2Te3: engineering microstructure towards high thermoelectric efficiency”, reported an unconventional melt-centrifugation technique that well tunes the microstructure and resultant thermoelectric transport properties of (Bi,Sb)2Te3. Using this new approach, a complex microstructure with large porosity and dense dislocations was obtained, leading to a great reduction in thermal conductivity due to both lack of conduction medium and phonon scattering.
Figure 1. Upper panels are schematic illustration of melt-centrifugation technique (left) and the resulted microstructure (right). Bottom panels are thermoelectric figure of merit (left) and the lattice thermal conductivity with a Debye model analysis presenting the contribution of interfaces, dislocation strain and porosity to the reduction (right).
Prof. Jing-Feng Li and Prof. Jeffrey Snyder are corresponding authors of this paper. Dr. Yu Pan, a PhD student from the School of Materials Science and Engineering (now a Postdoc at Max Planck Institute for Chemical Physics of Solids) is the first author of this paper. These studies received support from the Basic Science Center Project of NSFC under grant No.51788104 and the NSFC project No.11474176, as well as the Solid-State Solar-Thermal Energy Conversion Center (S3TEC), an Energy Frontier Research Center, funded by the U.S. Department of Energy, Of?ce of Science, Basic Energy Sciences (DE-SC0001299 and DE-SC0014520). Y. P. would like to acknowledge the Chinese Scholarship Council (CSC) for her scholarship in Northwestern University.
Prof. Jing-Feng Li’s group focuses on the research of microstructure engineering, the mechanisms for the transport properties, along with the enhancement of thermoelectric performance of advanced thermoelectric materials. In the past few years, they have published a series of papers in Bi2Te3 material system, based on the point defects modulation, nanocomposite synthesis, microscale texturing and etc. (e.g. AFM2013、JMCC2015、NPG Asia Mater 2016、Adv Sci 2017).
Links to the publication: https://onlinelibrary.wiley.com/doi/abs/10.1002/adma.201802016
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