The Influence of Silica Dioxide in the Electrocatalytic Performances of rGO/Fe₃O₄ as Oxygen Reduction Electrocatalyst

Abstract:

In this study, synthesis of reduced graphene oxide-iron oxide-silica dioxide (rGO/Fe₃O₄/SiO₂) was done through a facile chemical process. Physical characterization was carried out as such Fourier transform infrared spectroscopy (FTIR) which confirmed the presence of silica peak in the spectrum of rGO/Fe₃O₄/SiO₂, while RAMAN displayed the vibrational bands of carbon materials studied. Results of SEM-EDX and TEM confirmed the unification of SiO₂ on rGO/Fe₃O₄ nanocomposite with difference in morphologic structure. X-ray diffraction (XRD) analysis exhibited that addition of SiO₂ increased the crystalline size of the nanocomposite. Nitrogen adsorption isotherm analysis describes the nanocomposites fall in the mesopore region. The nanocomposite was then drop-casted on the surface of glassy carbon electrode (GCE) for fabrication of the electrode which denoted as rGO/Fe₃O₄/SiO₂/GCE. Electrochemical characterization of modified electrode was studied using electron impedance spectroscopy (EIS), which showed the minimal resistance charge transfer. Oxygen reduction reaction analysis shows that electrocatalytic reduction of oxygen was excellent with four-electron transfer when calculated using Randles-Sevcik equation. All the analysis was compared to the nanocomposites without the addition of silica oxide (rGO/Fe₃O₄)_. This work proves that addition of nanoparticle in a compound as a matrix improves the oxygen reduction potential of rGO/Fe₃O₄/SiO₂/GCE composite.

• Periodical: Solid State Phenomena (Volume 354)
• Pages: 143-149
• DOI: https://doi.org/10.4028/p-XRDbR5
• Online since: December 2023
• Authors: Farhanini Yusoff*, Karthi Suresh
• Keywords: Electron-Transfer, Fuel Cell, Iron Oxide, Oxygen Reduction Reaction, Reduced Graphene Oxide, Silica Oxide

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