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Title: Oxygen reduction reaction operated on magnetically-modified PtFe/C electrocatalyst
Authors: Zeng, J.
Liao, S.
Lee, J.Y. 
Liang, Z.
Keywords: Kinetic studies
Magnetically modified
Oxygen reduction reaction
Issue Date: Feb-2010
Citation: Zeng, J., Liao, S., Lee, J.Y., Liang, Z. (2010-02). Oxygen reduction reaction operated on magnetically-modified PtFe/C electrocatalyst. International Journal of Hydrogen Energy 35 (3) : 942-948. ScholarBank@NUS Repository.
Abstract: Electrocatalytic activity for oxygen reduction reaction on magnetically modified PtFe/C catalysts was investigated. X-ray powder diffraction (XRD) revealed that while the as-prepared PtFe/C catalysts were face-centered cubic (f.c.c), the as annealed catalysts at 700° for 3 h were face-centered tetragonal (f.c.t). Post-heating transformed the as-prepared catalysts from superparamagnetic into ferromagnetic materials as was measured by vibrating sample magnetometer (VSM). Electrochemical results obtained by rotating disk electrode (RDE) technique showed that oxygen reduction reaction took place by an overall four electron charge transfer process. Polarization curves showed that the electrocatalytic activity on ferromagnetic catalyst for oxygen reduction obviously outperformed the as-prepared paramagnetic catalyst. The values of kinetic parameters for the as-prepared and as-heated catalysts were obtained from linear-line region of mass-transfer-corrected Tafel plots. The catalytic enhancement by the magnetically modified catalyst was explained by the magnetic attractive force toward oxygen thus increasing electrochemical flux at the heterogeneous catalytic interface. © 2009 Professor T. Nejat Veziroglu.
Source Title: International Journal of Hydrogen Energy
ISSN: 03603199
DOI: 10.1016/j.ijhydene.2009.11.055
Appears in Collections:Staff Publications

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