首页|Pt-rGO-TiO_2 nanocomposite by UV-photoreduction method as promising electrocatalyst for methanol oxidation
Pt-rGO-TiO_2 nanocomposite by UV-photoreduction method as promising electrocatalyst for methanol oxidation
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NETL
NSTL
Elsevier
Pt/TiO_2-decorated reduced graphene oxide composite as catalyst for methanol electro-oxidation with three phase junction structure has been synthesized by UV-photoreduction (denoted as p-Pt/rGO@TiO_2). The obtained p-Pt/rGO@TiO_2 has been detailedly characterized by transmission electron microscope (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), cyclic voltammetry (CV) and chro-noamperometry (CA). XRD and TEM characterizations indicate that photoreduction is favorable to anchoring Pt nanoparticles (NPs) (ca. 2.2 nm) at the interface between TiO_2 and reduced graphene oxide (rGO), and forming the Pt, TiO_2 and rGO three phase junction structure. P-Pt/rGO@TiO_2 exhibits a higher activity for methanol electro-oxidation than m-Pt/rGO and m-Pt/rGO@TiO_2 (prepared by microwave-assisted polyol process). Lifetime tests demonstrate that the electrochemical durability of p-Pt/rGO@TiO_2 is improved by a factor of 2 or more as compared with m-Pt/rGO and m-Pt/rGO@TiO_2. XPS characterizations of p-Pt/rGO@TiO_2 reveal stronger interaction between Pt and support hybrid compared with m-Pt/rGO@TiO_2, which facilitates poisoning species removal and prevents Pt nanoparticles from migrating/agglomerating on or detaching from carbon support. This provides a facile and promising strategy to improve both the activity and durability of electrocatalysts for DMFCs.
NETL
NSTL
Elsevier
