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Research Papers

Methanol-Tolerant Oxygen Reduction Reaction at Pt–Pd/C Alloy Nanocatalysts

[+] Author and Article Information
A. Mary Remona1

Department of Chemistry, Fatima College, Madurai 625 018, Tamil Nadu, Indiamremona@yahoo.com

K. L. N. Phani

EEC Division, Central Electrochemical Research Institute, Karaikudi 630 006, Tamil Nadu, India

1

Corresponding author.

J. Fuel Cell Sci. Technol 8(1), 011001 (Oct 13, 2010) (6 pages) doi:10.1115/1.4001759 History: Received February 04, 2009; Revised January 28, 2010; Published October 13, 2010; Online October 13, 2010

Carbon-supported platinum and Pt–Pd alloy electrocatalysts with different Pt/Pd atomic ratios were synthesized by a microemulsion method at room temperature (metal loading is 10wt%). The Pt–Pd/C bimetallic catalysts showed a single-phase fcc structure and the mean particle size of Pt–Pd/C catalysts was found to be lower than that of Pt/C. The methanol-tolerant studies of the catalysts were carried out by activity evaluation of oxygen reduction reaction (ORR) on Pt–Pd catalysts using a rotating disk electrode (RDE). The studies indicated that the order of methanol tolerance was found to be PtPd3/C>PtPd/C>Pt3Pd/C. The oxygen reduction activities of all Pt–Pd/C were considerably larger than that of Pt/C with respect to onset and overpotential values. The Pd-loaded catalysts shift the onset potential of ORR by 125mVMSE, 53mVMSE, and 41mVMSE to less cathodic potentials for Pt3Pd/C, PtPd/C, and PtPd3/C, respectively, with reference to Pt/C and the Pt3Pd/C catalyst showed greater shift in the onset value than the other PtPd catalysts reported in literature. Moreover, the Pt–Pd/C catalysts exhibited much higher methanol tolerance during ORR than the Pt/C, assessing that these catalysts may function as a methanol-tolerant cathode catalysts in a direct methanol fuel cell.

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References

Figures

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Figure 1

XRD patterns of the Pt/C and Pt–Pd/C catalysts

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Figure 2

TEM images of (a) Pt/C, (b) Pt3Pd/C, (c) PtPd/C, and (d) PtPd3/C catalysts along with the corresponding particle size distribution histogram

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Figure 3

Cyclic voltammograms of the Pt/C catalyst and Pt–Pd/C catalysts in 0.5 M H2SO4 at 50 mV s−1 in the potential range of −0.65 mVMSE to 0.7 mVMSE (current densities are normalized to the geometric surface area)

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Figure 4

Cyclic voltammograms of the (a) Pt3Pd/C, (b) PtPd/C, and (c) PtPd3/C catalysts in 0.5 M H2SO4 with and without 0.5 M CH3OH in the potential range of −0.65 mVMSE to 0.7 mVMSE at 50 mV s−1 (current densities are normalized to the geometric surface area)

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Figure 5

Polarization curves of methanol oxidation on Pt/C and Pt–Pd/C catalysts in 0.5 M CH3OH–0.5 M H2SO4 at 2 mV s−1 in the potential range of −0.25 mVMSE to 0.4 mVMSE (current densities are normalized to the geometric surface area)

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Figure 6

Polarization curves for ORR on Pt/C and Pt–Pd/C catalysts in oxygen saturated 0.5 M H2SO4 at 5 mV s−1 in the potential range of −0.35 mVMSE to 0.65 mVMSE at ω=2500 rpm (current densities are normalized to the geometric surface area)

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Figure 7

Polarization curves for ORR on Pt/C and Pt–Pd/C catalysts at 5 mV s−1 in the potential range of 0.35 mVMSE to 0.65 mVMSE at ω=2500 rpm in oxygen saturated 0.5 M CH3OH+0.5M H2SO4

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Figure 8

Histograms representing mass activities of Pt/C and Pt–Pd/C catalysts for ORR in 0.5 M H2SO4 saturated with oxygen both in the presence and absence of 0.5 M CH3OH

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