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Author(s) |
Preethi, L. K.; Antony, R. P.; Mathews, T.; Dash, S.; Tyagi, A. K. (ACD)
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Source |
Journal of Nanoscience and Nanotechnology, 2016. Vol. 16 (9): pp. 10117-10124 |
ABSTRACT
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Platinum-TiO2 nano-composite catalyst for application in direct methanol fuel cells was prepared by loading Pt on to TiO2 nanotube powders synthesized by rapid breakdown anodization technique. Electron Microscopy and X-ray Diffraction results show that platinum loading on TiO2 nanotubes did not affect the tubular morphology and crystallinity. Transmission electron microscopy revealed that the platinum nano-particles of 3.5 nm average size are evenly distributed on TiO2 nanotubes. The presence of oxygen vacancy, Ti3+ and Pt in the catalyst are confirmed by X-ray photoelectron spectroscopy. The electrochemical active surface area calculated from cyclic voltammetric studies in acid and alkaline media show that the electrochemical active surface area of the nano-composite catalyst is larger in acid medium than in alkaline medium. The cyclic voltammetric investigation of methanol oxidation, at the Pt–TiO2 nano-composite electrode, confirmed that the catalyst exhibits lower onset potential for methanol oxidation and larger Jf/Jr ratio compared to those given in the literature. The catalyst poisoning rate determined from chronoamperometry shows that Pt–TiO2 nano-composites in acid medium has slower poisoning rate compared to that in alkaline medium. The Pt–TiO2 nano-composites prepared appears t o be a promising catalyst for application in direct methanol fuel cells operating in acid and alkaline media. |
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