MoS2 quantum sheets-PVDF nanocomposite film based self-poled piezoelectric nanogenerators and photovoltaically self-charging power cell

Two-dimensional (2D) dual-functional molybdenum disulfide (MoS2) quantum sheets (QSs) are attracted extensively due to their potential use in the field of energy harvesting and storage for new-generation flexible and wearable self-powered electronics. Herein, we successfully designed the photovoltaically self-charging power cell (PSCPC) and piezoelectric nanogenerator (PNG) utilizing the 2D 1 T-MoS2 QSs incorporated polyvinylidene fluoride (PVDF) film owing large dielectric properties and boost in the piezoelectric output performance. This unique MoS2 QSs-PVDF based piezoelectric nanogenerator consistently produces an output voltage of 47 Vpp and delivered a power density of 3.2 mWm 2, respectively, which is comparably higher than pristine PVDF film. The photoelectric conversion efficiency of the photovoltaic unit and charge storage properties of the prepared film was characterized via fabricating a photovoltaically self-charging power cell using PVA/H3PO4 electrolyte, TiO2/ Eosin Y dye as photon converter and MoS2 QSs embedded PVDF as a storage unit. On the illumination of visible light, the PSCPC device can self-charge up to 900 mV with a photocurrent of 25 mu A internally. In addition, the PSCPC can be integrated with clothing to generate green energy from natural sunlight and ambient indoor condition to directly power up wearable smart electronics. Overall, these studies can promote the dualfunctionality of the 1 T-MoS2 QSs in the development of flexible and wearable self-powered electronic devices.