“…Examples include nanoflakes, nanosheets, nanohoneycombs, nanotubes, and nanoflowers of WS 2 to enhance the performance of energy storage devices, specifically lithium-ion batteries (LIBs). Unique structures of WS 2 have rarely been studied for sodium-ion batteries (NIBs). , Although their counterparts, namely MoS 2 nanotubes, have been extensively studied for electrochemical energy storage, electrochemical hydrogen storage, and used as field effect transistors, up-to-date WS 2 nanotubes (WS 2 NTs) have only been studied in LIBs and NIBs to a muchlesser extent, even though they establish stable cycling over a wide voltage range. ,, Theoretical calculations indicated that single-wall WS 2 NTs are an exclusive type of semiconductor with an explicit band gap ranging from 0.1 to 1.9 eV, depending on their diameter. , They become both direct (in the case of a zigzag) and indirect (in the case of an armchair) band gap semiconductors controlled by chirality, making them useful for various technological applications such as next-generation electronic and optoelectronic devices and high-quality factor nanoelectromechanical systems. , However, the electronic properties of multiwall WS 2 NTs, which are currently produced in large amounts, are not that different from those of the bulk material, that is, having an indirect band gap of ∼1.9 eV . Such a small bandgap make them suitable for the next generation electrochemical energy storage devices.…”