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RESEARCH PAPERS

Fabrication Using High-Energy Ball-Milling Technique and Characterization of Pt-Co Electrocatalysts for Oxygen Reduction in Polymer Electrolyte Fuel Cells

[+] Author and Article Information
Pallavi Pharkya1

 University of British Columbia, Vancouver, British Columbia, Canada, V6T 1Z4pxp65@case.edu

Akram Alfantazi

 University of British Columbia, Vancouver, British Columbia, Canada, V6T 1Z4

Zoheir Farhat

 British Columbia Institute of Technology, Vancouver, British Colombia, Canada, V5G 3H2

1

Corresponding author. Present address: 10900, Euclid Avenue, Department of Materials Engineering, White Building, Cleveland, OH 44106.

J. Fuel Cell Sci. Technol 2(3), 171-178 (Feb 02, 2005) (8 pages) doi:10.1115/1.1895985 History: Received May 04, 2004; Revised February 02, 2005

This work discusses the fabrication and characterization of Pt-Co electrocatalysts for polymer electrolyte membrane fuel cells (PEMFC) and electrocatalysis of the oxygen reduction reaction. Two sets of carbon supported catalysts with Pt:Co in the atomic ratio of 0.25:0.75 and 0.75:0.25 were prepared using a high-energy ball-milling technique. One of the Pt-Co electrocatalysts was subjected to lixiviation to examine the change in surface area. Microstructural characterization of the electrocatalysts was done using scanning electron microscopy, transmission electron microscopy, x-ray diffractometry, and x-ray photoelectron spectroscopy. Electrochemical characterization of the electrocatalysts was done in acidic and alkaline media using cyclic voltammetry and potentiodynamic polarization techniques. These tests were performed at room and higher temperature (50°C). Performances of the electrocatalysts were also compared with the commercial E-TEK Pt:Co alloy electrocatalysts of the compositions 10% Pt-Co alloy (1:1 a/o) and 40% Pt-Co alloy (1:1 a/o) on Vulcan XC-72.

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Copyright © 2005 by American Society of Mechanical Engineers
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Figures

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Figure 1

TEM figures showing particle dispersion. Top row, from left: 40% PtCo-ETEK (1:1 a/o), 10% PtCo-ETEK (1:1 a/o), lixiviated catalyst. Bottom row, from left: PtCo-45hr-1%C-5hr, Pt0.25Co0.75-40hr, Pt0.25Co0.75-40hr-20%C-30min.

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Figure 2

(a) XRD patterns of 40% PtCo-ETEK, 10% PtCo-ETEK, lixiviated catalyst, PtCo-45-1%C-5hr; and (b) XRD patterns of Pt0.25Co0.75-40hr, Pt0.25Co0.75-40hr-20%C-30min

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Figure 3

(a) Narrow scan of Pt 4f peaks of Pt-AR, 40% PtCo-ETEK(1:1), lixiviated catalyst, Pt0.25Co0.75-40hr, PtCo-45hr-1%C-5hr; (b) Narrow scan of Pt 4f peaks of Pt0.25Co0.75-40hr; and (c) Narrow scan of Co 2p peaks of PtCo-45hr-1%C-5hr 40% PtCo-ETEK, lixiviated catalyst, Pt0.25Co0.75-40hr, PtCo-45hr-1%C-5hr

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Figure 4

(a) Cyclic voltammograms of as-received Pt (Pt-AR), 40% PtCo-ETEK, 10% PtCo-ETEK, lixiviated catalyst at 22°C in 0.5M H2SO4; (b) Cyclic voltammograms of Pt0.25Co0.75-40hr, PtCo-45hr-1%C-5hr, Pt0.25Co0.75-40hr-20%C-30min at 22°C in 0.5M H2SO4.

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Figure 5

(a) Cyclic voltammograms of Pt-AR, 40% PtCo-ETEK, 10% PtCo-ETEK, lixiviated catalyst at 22°C in 0.25M NaOH; and (b) Cyclic voltammograms of Pt0.25Co0.75-40hr, PtCo-45hr-1%C-5hr, Pt0.25Co0.75-40hr-20%C-30min at 22°C in 0.25M NaOH.

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Figure 6

(a) Cyclic voltammograms of Pt (Pt-AR), 40% PtCo-ETEK, 10% PtCo-ETEK, and lixiviated catalyst at 50°C in 0.5M H2SO4; and (b) Cyclic voltammograms of Pt0.25Co0.75-40hr, PtCo-45hr-1%C-5hr, Pt0.25Co0.75-40hr-20%C-30min at 50°C in 0.5M H2SO4.

Grahic Jump Location
Figure 7

(a) Cyclic voltammograms of Pt-AR, 40%PtCo-ETEK, 10PtCo-ETEK and lixiviated catalyst at 50°C in 0.25M NaOH; and (b) Cyclic voltammograms of Pt0.25Co0.75-40hr, Pt0.25Co0.75-40hr-20%C-30min at 50°C in 0.5M NaOH.

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