Synthesis and Characterization of Graphene Oxide/Metal Oxide Nanostructures and Study of Their Catalytic Activities for Water Splitting

Date

2025-6-16

Author

Gedik, Başak

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With the rising demand for energy and the depletion of fossil fuel reserves, the need for cleaner and more sustainable energy sources has become urgent. Hydrogen stands out as a promising energy carrier due to its high efficiency and eco-friendly nature. Among various production methods, electrochemical water splitting is considered one of the most environmentally friendly approaches; however, its high energy requirement limits large-scale application. Transition metal oxides such as NiMoO4 and CoMoO4 have shown notable electrocatalytic performance, especially when supported on graphene oxide (GO), benefiting from their redox-active properties. The synergistic interaction between metal oxide phases and the conductive GO matrix improves charge transfer and increases the number of active sites. In this study, a novel GO–CoMoO4–NiMoO4 hybrid nanostructure was synthesized via a hydrothermal method and characterized by FT-IR, UV-Vis, XRD, SEM, EDX, TEM, XPS, ICP-OES, and BET techniques. Its electrocatalytic performance toward the oxygen evolution reaction (OER) in an alkaline medium was evaluated using a three-electrode system with a glassy carbon electrode (GCE). Among the synthesized materials, the P–U–GO–CoMoO4–NiMoO4 (P: Precursors, U: Urea) hybrid showed superior performance with an onset potential of 1.56 V vs. RHE, an overpotential of 550 mV at 10 mA/cm2, and a Tafel slope of 71.8 mV/dec in 0.1 M KOH. The enhanced activity is attributed to the increased conductivity and abundant redox-active surface sites provided by NiMoO4 and CoMoO4 on the GO matrix. These results demonstrate potential of this hybrid as a cost-effective electrocatalyst for hydrogen production.

Subject Keywords

Metal Oxide Nanoparticles, Graphene Oxide, Electrochemical Water Splitting, Electrocatalysis, Hybrid Nanomaterials

URI

https://hdl.handle.net/11511/115110

Collections

Graduate School of Natural and Applied Sciences, Thesis