Multiferroic BiFeO3-based hydrophobic polymer composites for polarization rationalization-induced piezo-tribo hybrid energy harvesting and versatile self-powered mechanosensing. Issue 20 (16th September 2022)

• Record Type: Journal Article
• Authors: Sasmal, Abhishek; Patra, Aniket; Maity, Sourav; Pratihar, Shewli; Sen, Shrabanee
• Is Part Of: Sustainable energy & fuels. Volume 6:Issue 20(2022)
• Page Start: 4652
• Page End: 4668
• Publication Date: 2022-09-16
• Subjects: Renewable energy sources -- Periodicals; Fuel cells -- Periodicals; Electric batteries -- Periodicals; Electrochemistry -- Periodicals; 660.297
• DOI: 10.1039/d2se00947a
• Languages: English
• ISSNs: 2398-4902

Abstract

Abstract : Multiferroic BiFeO3 -based polymer composites and their suitable combinations by rationalization of polarization have been utilized to design an efficient piezo-tribo hybrid nanogenerator for real life energy harvesting and sensing applications. Abstract : BiFeO3 -poly(vinylidene fluoride) (BFO-PVDF) and BiFO3 -polydimethylsiloxane (BFO-PDMS) piezoelectric composite films have been fabricated herein and used to develop flexible piezoelectric-triboelectric hybrid nanogenerators by forming different combinations with aluminium (Al) electrodes (PVDF-Al, PDMS-Al and PDMS-PVDF) using the contact-separation mode. The dielectric permittivity of both the PVDF- and PDMS-based composites has been found to increase from ∼9 and 3.2 for a filler loading of 3 wt% to ∼16.6 and 4.7, respectively, for 10 wt% BFO concentration within their matrix. The mechanical stimulus-driven output voltage has also been found to be increased from ∼7.5 V and 35 V to ∼18 V and 100 V for the respective films. The rational augmentation of the polarization of PVDF and PDMS induced by the gradually increased BFO filler concentration in their matrix, as confirmed from the above-mentioned results, have been found to significantly affect the output performance of the fabricated piezo-tribo hybrid nanogenerators. Among the three types of fabricated hybrid devices, the combination of 10 wt% BFO-incorporated PDMS with an aluminium electrode shows the best output performance both theoretically and experimentally. Hence, this combination has been used to develop a flexible multi-unit hybrid nanogenerator (M-HNG), which shows further performance enhancement (output power density: ∼600 μW cm −2 ). The M-HNG was then used for biomechanical energy harvesting, powering small electronics and different self-powered mechanosensing applications including motion sensing, pressure sensing, water drop counting and phonation monitoring.