Structural evolution-driven enhancement of thermoelectric performance in Bi-S-Se solid solutionsOA
Bismuth sulfide(Bi_(2)S_(3))has garnered extensive attention for thermoelectric(TE)applications due to its earth abundance,nontoxicity,and ultralow lattice thermal conductivity.However,simultaneously improving its electrical and thermal properties remains challenging due to the strong coupling between these parameters.Herein,we propose a structural evolution strategy to synergistically optimize the electrical and thermal transport properties of Bi_(2)S_(3)-based TE compounds.By leveraging the distinct crystal structures of Bi_(2)S_(3) and Bi2Se3,alloying Se at S sites successfully reconstructs the carrier transport channels within the Bi_(2)S_(3) matrix,thereby facilitating carrier mobility.Additionally,the weakened chemical bonding leads to a significant increase in carrier concentration,approaching the optimal range.Furthermore,the structural evolution from particle-like to lamellar grains,coupled with the large mass difference between Se and S,induces lattice distortion that effectively reduces the lattice thermal conductivity.Combining the dramatically enhanced power factor and ultralow thermal conductivity,an optimized figure of merit(ZT)of 0.38 at 623 K is achieved in the Bi2SSe2 solid solution.This structural evolution strategy offers a promising avenue for enhancing the TE performance of binary compounds.
Kun Huang;Zi-Yuan Wang;Chong-Yu Wang;Yi-Xin Zhang;Ye-Hua Jiang;Jing Feng;Zhen-Hua Ge
Faculty of Materials Science and Engineering,Kunming University of Science and Technology,Kunming 650093,ChinaFaculty of Materials Science and Engineering,Kunming University of Science and Technology,Kunming 650093,ChinaFaculty of Materials Science and Engineering,Kunming University of Science and Technology,Kunming 650093,ChinaFaculty of Materials Science and Engineering,Kunming University of Science and Technology,Kunming 650093,ChinaFaculty of Materials Science and Engineering,Kunming University of Science and Technology,Kunming 650093,ChinaFaculty of Materials Science and Engineering,Kunming University of Science and Technology,Kunming 650093,ChinaFaculty of Materials Science and Engineering,Kunming University of Science and Technology,Kunming 650093,China
通用工业技术
functional ceramicsthermoelectric materialBi_(2)S_(3)structural evolution
《Journal of Advanced Ceramics》 2026 (2)
P.211-220,10
the financial support from the National Natural Science Foundation of China(Nos.52562030 and 12574036)the National Key R&D Program of China(No.2022YFF0503804)the Academician(Expert)Workstation of Yunnan Province Program(No.202405AF140066)Yunnan Science and Technology Program(No.202401AT070403)Yunnan Fundamental Research Projects(No.202401BE070001-004)Yunnan Major Scientific and Technological Project(No.202302AG050010).
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