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Pt Nanoparticles Supported on Mesoporous CeO<sub>2</sub> Nanostructures Obtained through Green Approach for Efficient Catalytic Performance toward Ethanol Electro-oxidation
In
this report, an easy and green approach to the synthesis of
mesoporous cerium oxide (CeO<sub>2</sub>) nanostructures and followed
by supporting platinum nanoparticles (NPs) on CeO<sub>2</sub> nanostructures
(Pt/CeO<sub>2</sub>) and their application as versatile electrocatalysts
for ethanol electrooxidation has been established. The synthesis of
mesoporous Pt/CeO<sub>2</sub> nanostructures involves two steps. First,
mesoporous CeO<sub>2</sub> nanostructures were synthesized via macroalgae
polymer mediated approach and followed by supporting of PtNPs of ca.
5–10 nm over the mesoporous CeO<sub>2</sub> 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 mesoporous CeO<sub>2</sub> support resulting in the generation of more oxygen vacancies,
which can facilitate the enhanced charge transport at their functional
interface. Significantly, the synthesized mesoporous Pt/CeO<sub>2</sub> nanostructures were found to show enhanced electrocatalytic activity
for ethanol electrooxidation reaction. The enhanced performance is
attributed to the synergistic effect of both mesoporous structure
and the formation of more oxygen vacancies in the resultant Pt/CeO<sub>2</sub> nanostructures. Our facile and eco-friendly approach to the
synthesis of mesoporous CeO<sub>2</sub> nanostructures that supports
PtNPs with an excellent catalytic activity is validated as a promising
strategy for potential applications in fuel cells