Surfactant free green synthesis of GOSiMa hybrid nanocomposite for charge storage application

Abstract

Present work reveals the synthesis of graphene oxide-silica@magnesium oxide (GO-SiO2@MgO)/(GOSiMa) hybrid nanocomposite by using a green sol-gel technique from its constituent precursors GO sheets, tetraethyl orthosilicate (TEOS) and magnesium chloride (MgCl2). Broad ranges of characterization techniques like TEM, FESEM, EDAX, FTIR, XRD, DLS and BET are followed to investigate the hybrid composite. The cyclic voltammetry (CV) behaviour is studied at N2 and O2 atmosphere with Ag/AgCl electrode as a reference. The surface area of nanocomposites is found to be 107.59 m2/g with an average porosity value of 97.8602 Å. From the dielectric study, it is found that, synthesized GOSiMa nanocomposite has dielectric constant ε′ from 102 up to 2.5 × 104 with the minimal dielectric loss ε′′ of ≤102 at all range of temperature 22 °C–185 °C and frequency range of 103–106 Hz. The effect of polarization and atomic rearrangements are the prime factors for enhancement of dielectric constant. Conductivities (σac) of this hybrid nanocomposite are measured as 8 × 10−3 S/m in the low-frequency region at 1 kHz and 1 × 10−2 S/m at a high-frequency region of 2 MHz at a temperature of 160 °C for justifying the as-synthesized nanocomposite is a potential power electronics candidate for application in the charge storage device. The current work highlights the dielectric and charge storage potential of the prepared hybrid nanocomposite in a cost-effective and eco-friendly method.