Topotactic anion-exchange in thermoelectric nanostructured layered tin chalcogenides with reduced selenium content
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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.
Han , G , Popuri , S , Greer , H F , Zhang , R , Ferre-Llin , L , Bos , J-W G , Zhou , W , Reece , M J , Paul , D J , Knox , A R & Gregory , D H 2018 , ' Topotactic anion-exchange in thermoelectric nanostructured layered tin chalcogenides with reduced selenium content ' Chemical Science , vol 9 , no. 15 , pp. 3828-3836 . DOI: 10.1039/C7SC05190E
© 2018, the Author(s). Open Access Article. This article is licensed under a Creative Commons Attribution 3.0 Unported Licence.
DescriptionThis work was financially supported by the EPSRC (EP/K022156/1 and EP/P510968/1). SRP and JWGB acknowledge the EPSRC for support (EP/N01717X/1). HFG and WZ acknowledge the EPSRC for the Equipment Grant to purchase a Titan Themis 200 microscope (EP/L017008/1). MJR and RZ would like to acknowledge the EPSRC for support under the DEFCOM grant (EP/N022726/1). RZ acknowledges the support from a Marie Curie International Incoming Fellowship within the 7th European Community Framework Programme (Contract No. PIIF-GA-2013-624474).
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