High‐Performance Flexible Piezo–Tribo Hybrid Nanogenerator Based on MoS2@ZnO‐Assisted β‐Phase‐Stabilized Poly(Vinylidene Fluoride) Nanocomposite

Abstract

The fabrication of nanogenerators is most promising for the worldwide energy crisis situation. Nowadays, piezoelectric nanogenerators (PENGs) and triboelectric nanogenerators are getting immense recognition in the energy field. Herein, piezoelectric and triboelectric effects are combined in a fabricated piezo–tribo hybrid nanogenerator (HNG) for better output performance. A few layered MoS2 on Cu foil via electrodeposition process is deposited and then ZnO is incorporated through electrodeposition, followed by spin coating of poly(vinylidene fluoride) (PVDF) as piezoelectric material. Incorporation of ZnO increases both the piezoelectric property of the PENG and the triboelectric performance. The PVDF/MoS2@ZnO‐based HNG shows astonishing results of open‐circuit voltage (≈140 V) and short‐circuit current (≈4.6 μA) with 256 μW cm−2 power density under piezo‐tribo imparting, which is even better than most ultramodern and complex cleanroom processed nanogenerators. With excellent output performance, this HNG is also capable of harvesting energy from various mechanical and biological movements like walking, heel pressing, elbow bending, and machine vibration. It can lighten up 33 LEDs connected in series and can power up electronic devices like a calculator and wristwatch. The PENG is also biocompatible and sensitive toward physiological signal monitoring, which can be useful for potential biomedical applications.