Pt-modified Au/C catalysts for direct glycerol electro-oxidation in an alkaline medium
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Author list: Lertthahan P., Yongprapat S., Therdthianwong A., Therdthianwong S.
Publisher: Elsevier
Publication year: 2017
Journal: International Journal of Hydrogen Energy (0360-3199)
Volume number: 42
Issue number: 14
Start page: 9202
End page: 9209
Number of pages: 8
ISSN: 0360-3199
Languages: English-Great Britain (EN-GB)
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Abstract
Au-based catalysts promoted with Pt were prepared by using polyvinyl alcohol protection method. Different amounts of Pt (5, 10 and 15% of total metal) were added in the Au sol formation step to improve the activity of Au/C toward glycerol electro-oxidation in an alkaline medium. The physical and electrochemical properties of the as-prepared catalysts were explored. The average particle sizes of the Au/C and Pt-modified Au/C catalysts measured by transmission electron microscopy (TEM) were the same at around 4 nm. The PtAu/C alloy formation in the PtAu/C catalysts was confirmed by the increase of lattice parameter calculated from the X-ray diffraction (XRD) patterns and by the absence of Pt ring in the electron diffraction pattern. The change of binding energy in X-ray photoelectron spectroscopy (XPS) results indicated the interaction between Pt and Au. For glycerol electro-oxidation in an alkaline medium, the PtAu/C catalysts were more active than the Au/C catalyst as observed from an early onset potential and a shift of potential at maximum current density to a lower potential. Among the Pt-modified Au/C catalysts, the most active catalyst was Pt1Au9/C. The synergistic effects between Pt–Au was proven by a better performance of the PtAu/C compared to the physical mixed catalyst of Au/C and Pt/C at the same Pt:Au ratio. The Pt-modified Au/C catalysts were more stable than the Au/C, especially in a high potential region. This enhancement may be caused by the promotion effect of highly active PtO on the surface of the bimetallic catalyst. © 2016 Hydrogen Energy Publications LLC
Keywords
Direct alcohol alkaline fuel cell, PtAu/C
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