Topotactic anion-exchange in thermoelectric nanostructured layered tin chalcogenides with reduced selenium content

Chemical Science
Guang HanDuncan H Gregory

Abstract

Anion exchange has been performed with nanoplates of tin sulfide (SnS) via "soft chemical" organic-free solution syntheses to yield layered pseudo-ternary tin chalcogenides on a 10 g-scale. SnS undergoes a topotactic transformation to form a series of S-substituted tin selenide (SnSe) nano/micro-plates with tuneable chalcogenide composition. SnS0.1Se0.9 nanoplates were spark plasma sintered into phase-pure, textured, dense pellets, the ZT of which has been significantly enhanced to ≈1.16 from ≈0.74 at 923 K via microstructure texturing control. These approaches provide versatile, scalable and low-cost routes to p-type layered tin chalcogenides with controllable composition and competitive thermoelectric performance.

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Citations

Apr 11, 2020·Advanced Science·Xiao-Lei ShiZhi-Gang Chen
Jun 25, 2020·Sensors·Chunmei LiXuemei Wang
Aug 14, 2021·ACS Applied Materials & Interfaces·Meiling YangGuang Han
May 16, 2020·ACS Applied Materials & Interfaces·Bin ZhangXiaodong Han
Jul 3, 2020·Chemical Reviews·Xiao-Lei ShiZhi-Gang Chen
Aug 29, 2019·ACS Omega·Iryna S ProtsakDuncan H Gregory

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Methods Mentioned

BETA
X-ray
Scanning electron microscopy
electron
transmission electron microscopy
electron diffraction

Software Mentioned

GSAS
EXPGUI

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