Enhanced thermoelectric performance of Cu3SbS4 flower-like hierarchical architectures composed of Cl doped nanoflakes via an in situ generated CuS template

• Published in: Physical chemistry chemical physics : PCCP Vol. 20; no. 3; pp. 1460 - 1475
• Main Authors: Wang, Qun, Li, Jianhuan, Li, Jianjun
• Format: Journal Article
• Language: English
• Published: Cambridge Royal Society of Chemistry 2018
• Subjects: Chalcogenides; Chlorine; Copper sulfides; Ion exchange; Lead; Microspheres; Optical properties; Power factor
• ISSN: 1463-9076; 1463-9084
• DOI: 10.1039/c7cp06465a

In this work, Cu3SbS4 hierarchical flower-like microspheres composed of chlorine (Cl−)-doped Cu3SbS4 nanoflakes are realized via a one pot solvothermal ion exchange reaction. The kinetic factors including the duration time, the ratio of source materials, and the KOH concentration, are systematically investigated. Using a suite of analytical techniques, including SEM, XRD and FTIR, the mechanism of the two stage in situ chemical transformation of CuS flower-like microspheres consisting of nanoflake intermediates to the target product Cu3SbS4 is elucidated. The difference in solubility between reactants and products (Ksp(CuS) > Ksp(CuSbSx)) determines that the ion-exchange reaction from transition binary to ternary metal chalcogenides is favorable under the impetus of a thermodynamic driving force. In addition, the optical and enhanced thermoelectric transport properties are investigated. The results revealed that Cl-doped Cu3SbS4 exhibited an improved power factor, which was 8 times higher than that of undoped Cu3SbS4 at 500 K. The current study not only provides a facile and economical way to synthesize high-quality Cl-doped Cu–Sb–S three dimensional (3D) hierarchical nanostructures, but also opens up a new route for preparation of other I–V–VI multicomponent chalcogenide NCs, such as Cu–Bi–S and Cu–Pb–S systems, which would be difficult to obtain otherwise.