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In this report, an easy and green approach to the synthesis of mesoporous cerium oxide (CeO₂) nanostructures and followed by supporting platinum nanoparticles (NPs) on CeO₂ nanostructures (Pt/CeO₂) and their application as versatile electrocatalysts for ethanol electrooxidation has been established. The synthesis of mesoporous Pt/CeO₂ nanostructures involves two steps. First, mesoporous CeO₂ nanostructures were synthesized via macroalgae polymer mediated approach and followed by supporting of PtNPs of ca. 5–10 nm over the mesoporous CeO₂ nanostructures using seed-mediated chemical reduction process. The structural and spectroscopic characterization techniques such as transmission electron microscopy (TEM), X-ray diffraction (XRD), Raman, X-ray photoelectron spectroscopy (XPS), and small-angle X-ray scattering (SAXS) studies confirm the strong coupling between PtNPs and the …