Facile preparation of SnS2 nanoflowers and nanoplates for the application of high-performance hybrid supercapacitors

In this work, the SnS2 nanoflowers (SnS2 NFs) were solvothermally prepared in the solvent of ethanol, while SnS2 nanoplates (SnS2 NPs) were obtained through the identical condi-tions except for the solvent of water. The flowers were assembled with numerous nano -sheets with very thin thickness, and the NPs exhibited hexagonal shape. When used as the battery-type electrode material for supercapacitors, the SnS2 NFs delivered a specific ca-pacity of as high as 264.4 C g-1 at 1 A g-1, which was higher than the 201.6 C g-1 of SnS2 NPs. Furthermore, a hybrid supercapacitor (HSC) was assembled with the SnS2 as positive electrode and activated carbon (AC) as negative electrode, respectively. The SnS2 NFs//AC HSC exhibited a high energy density of 28.1 Wh kg-1 at 904.3 W kg-1, which was higher than the 24.2 Wh kg-1 at 844.3 W kg-1 of SnS2 NPs//AC HSC. Especially, when the power density was enhanced to the highest value of 8666.8 W kg-1, the NFs-based device could still hold 20.4 Wh kg-1. In addition, both HSC devices showed an excellent cycling stability after 5000 cycles at 5 A g-1. The present method is simple and can be extended to the preparation of other transition metal sulfides (TMSs)-based electrode materials with bril-liant electrochemical performance for supercapacitors.(c) 2022 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.