Highly Enhanced Thermoelectric Properties of Bi/Bi2S3 Nanocomposites

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• 作者：Zhen-Hua GePeng Qin ; DongSheng He ; Xiaoyu Chong ; Dan Feng ; Yi-Hong Ji ; Jing Feng ; Jiaqing He
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2017
• 出版时间：February 8, 2017
• 年：2017
• 卷：9
• 期：5
• 页码：4828-4834
• 全文大小：679K
• ISSN：1944-8252

文摘

Bismuth sulfide (Bib>2b>Sb>3b>) has been of high interest for thermoelectric applications due to the high abundance of sulfur on Earth. However, the low electrical conductivity of pristine Bib>2b>Sb>3b> results in a low figure of merit (ZT). In this work, Bib>2b>Sb>3b>@Bi core–shell nanowires with different Bi shell thicknesses were prepared by a hydrothermal method. The core–shell nanowires were densified to Bi/Bib>2b>Sb>3b> nanocomposite 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 Bib>2b>Sb>3b>@Bi nanowire powders prepared by treating Bib>2b>Sb>3b> nanowires in a hydrazine solution for 3 h is 3 orders of magnitude greater than that of a pristine Bib>2b>Sb>3b> sample. 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.