title: Highly Enhanced Thermoelectric Properties of Bi/Bi2S3Nanocomposites.
abstract: Bismuth sulfide (Bi2S3) has been of high interest for thermoelectric applications due to the high abundance of sulfur on Earth. However, the low electrical conductivity of pristine Bi2S3results in a low figure of merit (ZT). In this work, Bi2S3@Bi core-shell nanowires with different Bi shell thicknesses were prepared by a hydrothermal method. The core-shell nanowires were densified to Bi/Bi2S3nanocomposite by spark plasma sintering (SPS), and the structure of the nanowire was maintained as the nanocomposite due to rapid SPS processing and low sintering temperature. The thermoelectric properties of bulk samples were investigated. The electrical conductivity of a bulk sample after sintering at 673 K for 5 min using Bi2S3@Bi nanowire powders prepared by treating Bi2S3nanowires in a hydrazine solution for 3 h is 3 orders of magnitude greater than that of a pristine Bi2S3sample. The nanocomposite possessed the highest ZT value of 0.36 at 623 K. This represents a new strategy for densifying core-shell powders to enhance their thermoelectric properties.
authors.affiliation: Faculty of Materials Science and Engineering, Kunming University of Science and Technology , Kunming 650093, China.|Shenzhen Key Laboratory of Thermoelectric Materials, Department of Physics, South University of Science and Technology of China , Shenzhen 518055, China.
authors.forename: Zhen-Hua
authors.identifier: http://orcid.org/0000-0001-8810-5103
authors.initials: ZH
authors.lastname: Ge
authors.affiliation: Faculty of Materials Science and Engineering, Kunming University of Science and Technology , Kunming 650093, China.
authors.forename: Peng
authors.initials: P
authors.lastname: Qin
authors.affiliation: Shenzhen Key Laboratory of Thermoelectric Materials, Department of Physics, South University of Science and Technology of China , Shenzhen 518055, China.
authors.forename: DongSheng
authors.initials: D
authors.lastname: He
authors.affiliation: Faculty of Materials Science and Engineering, Kunming University of Science and Technology , Kunming 650093, China.
authors.forename: Xiaoyu
authors.initials: X
authors.lastname: Chong
authors.affiliation: Shenzhen Key Laboratory of Thermoelectric Materials, Department of Physics, South University of Science and Technology of China , Shenzhen 518055, China.
authors.forename: Dan
authors.initials: D
authors.lastname: Feng
authors.affiliation: Faculty of Materials Science and Engineering, Kunming University of Science and Technology , Kunming 650093, China.
authors.forename: Yi-Hong
authors.initials: YH
authors.lastname: Ji
authors.affiliation: Faculty of Materials Science and Engineering, Kunming University of Science and Technology , Kunming 650093, China.
authors.forename: Jing
authors.initials: J
authors.lastname: Feng
authors.affiliation: Shenzhen Key Laboratory of Thermoelectric Materials, Department of Physics, South University of Science and Technology of China , Shenzhen 518055, China.|State Key Laboratory of Silicon Materials, Zhejiang University , Hangzhou 310027, China.
authors.forename: Jiaqing
authors.initials: J
authors.lastname: He
keywords: Bi; Bi2S3; core−shell; nanowires; thermoelectric