Two Faces Under a Hood: Unravelling the Energy Harnessing and Storage Properties of 1T-MoS 2 Quantum Sheets for Next-Generation Stand-Alone Energy Systems.

The two-dimensional 1T-MoS 2 quantum sheets (QSs) continuously seek attention due to their extraordinary energy harnessing and storage properties towards designing an all-in-one self-charging power system (SCPS). Herein, we have utilized the superior dual-functional nature of exfoliated MoS 2 QSs for SCPS via fabricating all-solid-state microsupercapacitors (MSC) as an energy storage device and triboelectric nanogenerator (TENG) with MoS 2 QSs based charge-trapping interfacial layer as the energy harvester. The electrochemical analysis of MoS 2 QSs MSC indicated their superior capacitive properties with a high areal capacitance (4.3 mF cm -2 ), energy density (0.38 μWh cm -2 ), and long cycle life. Furthermore, we emphasize the fabrication of MSC with shape diversity and performance uniformity via construction in several designable shapes, which exhibit superior electrochemical performances. The MoS 2 QSs based charge-trapping layer enhances the output performance of TENG dramatically with a peak power density as large as 10 μW cm -2 , which is 13-fold greater than that of the pristine TENG. As proof of the concept, we fabricated an all MoS 2 based SCPS which showed their ability to self-charge up to a maximum of 1050 mV, outperforming many SCPS reported previously. Overall, this work creates a way to utilize the bifunctional properties of MoS 2 QSs for the development of next-generation SCPS.