Facile Synthesis and Electrochemical Characterization of Pt and Pt-based Electrocatalysts Supported on Reduced Graphene Oxide

Introduction/Objective: The preparation of PtNiCo/reduced graphene oxide (RGO) nanocatalysts with excellent activity and stability using a facile, microwave-assisted, and cost-ef-fective synthetic method is crucial for the commercial application of fuel cells and clean energy technologies. This study examines the impact of varying metal ratios on the catalytic properties of PtNiCo/RGO and compares them with those of Pt/RGO. Methods: PtNiCo/RGO nanocatalysts were synthesized via a microwave-assisted hydrothermal method using ethylene glycol as the solvent. Different metal precursor ratios were used to prepare PtNiCo/RGO-1, -2, and -3. The physical and electrochemical characteristics of the synthesized cat-alysts were analyzed using transmission electron microscopy (TEM), X-ray diffraction (XRD), and various electrochemical tests. Results: Among the synthesized samples, PtNiCo/RGO-3 demonstrated the best performance, with an electrochemical surface area (ECSA) of 82.61 m²/g, 2.7 times higher than that of Pt/RGO (30.39 m²/g). It also exhibited a lower CO oxidation potential and better stability during electrochemical methanol oxidation. TEM analysis confirmed a thin nanoparticle morphology with average diame-ters of 2–5 nm. Discussion: The enhanced performance of PtNiCo/RGO-3 is attributed to the synergistic effects among Pt, Ni, Co, and the RGO support. These interactions improved electron transfer, dispersion, and resistance to catalyst poisoning. Conclusion: PtNiCo/RGO-3 demonstrates excellent catalytic activity, anti-poisoning characteris-tics, and durability, making it a promising electrocatalyst for fuel cells and hydrogen production. This work supports the development of cost-effective and efficient clean energy technologies, align-ing with the United Nations Sustainable Development Goal 7 (Affordable and Clean Energy).