Muhammad Fathar Aulia, Abdul Asywalul Fazri, Suci Winarsih, Mohammad Hamzah Fauzi, Jumaeda Jatmika, Setia Budi
In this study, bimetallic nickel-cobalt electrocatalysts with different Ni:Co ratios were electrodeposited onto indium tin oxide substrates coated by polyethylene terephthalate and evaluated as cost-effective catalysts for ethanol electrooxidation reaction. The physical features of the catalysts were studied using X-ray diffraction (XRD), Raman spectroscopy and field-emission scanning electron microscopy, along with energy-dispersive X-ray spectroscopy. XRD analysis revealed a phase transition from a mixed face-cantered cubic (FCC) and hexagonal close-packed structure to a single FCC phase, as the cobalt content decreased. This change in phases greatly affected the shape of the catalyst, changing from a pebbly texture in the mixed-phase samples to a smooth, rounded shape in the single-phase FCC samples. The electrochemical properties and catalytic performance of ethanol oxidation in alkaline medium were investigated using cyclic voltammetry and electrochemical impedance spectroscopy. The tested electrocatalysts revealed that NiCo B having Ni:Co ratio 82:18 possess the best catalytic activity compared to the other catalysts, reaching a current density of 14.82 mA cm-2 for ethanol electrooxidation reaction and showing great stability. This better performance is due to its improved physical structure, which boosts the interaction between nickel and cobalt, and lowers resistance to charge transfer. These findings demonstrate the promise of NiCo as an efficient electrocatalyst for ethanol electrooxidation reaction. © 2025 by the authors; licensee IAPC, Zagreb, Croatia.
The Center for Science Innovation, Arva Building, Jl. RP. Soeroso, Jakarta Pusat, 10350, Indonesia; Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Negeri Jakarta, Jl. Rawamangun Muka, Jakarta, 13220, Indonesia; Research Center for Quantum Physics, National Research and Innovation Agency (BRIN), South Tangerang, 15314, Indonesia
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