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RESEARCH PAPERS

Rotating Disk Electrode Study of Supported and Unsupported Catalysts for PEMFC Application

[+] Author and Article Information
F. Dundar, N. Sammes

Connecticut Global Fuel Cell Center, UCONN, 44 Weaver Road, Storrs, CT 06269-5233

A. Smirnova1

Connecticut Global Fuel Cell Center, UCONN, 44 Weaver Road, Storrs, CT 06269-5233

X. Dong

 Aerogel Composite, LLC c/o ICA, Inc., 102-R Filley Street, Unit H, Bloomfield CT 06002-1853

A. Ata

 Gebze Institute of Technology, Istanbul Caddesi, 101 Gebze Kocaeli, 41400, Turkey

1

Corresponding author.

J. Fuel Cell Sci. Technol 3(4), 428-433 (May 03, 2006) (6 pages) doi:10.1115/1.2349524 History: Received December 05, 2005; Revised May 03, 2006

The electrochemical study of different supported and unsupported Pt-based catalysts used in polymer electrolyte fuel cells (PEMFCs) has been made by means of thin film rotating disk electrode (RDE) method. The comparison of electrochemical surface area (ESA) was made using cyclic voltammetry measurements in H2SO4 or HClO4 at room temperature and scanning rates of 20 and 100mVs. Oxygen reduction activity for aerogel-supported and carbon-supported Pt catalysts was evaluated at various rotation speeds in the range of 02500rpm and compared to the catalytic activity of unsupported Pt-black catalyst. The calculated values of Levich constant for the oxygen reduction reaction (ORR) indicate dependence on the applied voltage and either 4 or 2–4 electron transfer mechanism. The hydrogen peroxide by-product formation was determined with a rotating ring disk electrode (RRDE) and was observed to take place mostly at voltages below 0.6V due to the limitations from mass transport effects. The results obtained at different Pt loadings in the range of 1046.5wt% Pt demonstrated that XC-72 and aerogel-based catalysts are foreseen to have higher ESA in comparison to other tested supported and unsupported commercially available catalysts.

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Copyright © 2006 by American Society of Mechanical Engineers
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Figures

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Figure 1

CV results for 35% Pt∕C-Vulcan XC-72, 46.5% Pt∕C Tanaka, 10% Pt∕C-Aerogel and Pt-black catalysts at 20mV∕s sweep rate and room temperature in 0.1MHClO4 electrolyte

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Figure 2

(a) The disk currents obtained at indicated rotation speeds for 35wt%Pt∕C Vulcan XC-72 catalyst at 20mV∕s sweep rate. (b) The mass transport corrected kinetic current at room temperature and at 1600rpm rotation speed. (c) The Levich-Koutecky plot at 0.4V for the same catalyst.

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Figure 3

(a) The disk currents obtained at indicated rotation speeds for 46.5wt%Pt∕C Tanaka catalyst at 20mV∕s sweep rate. (b) The mass transport corrected kinetic current at room temperature and at 1600rpm rotation speed. (c) The Levich-Koutecky plot at 0.4V for the same catalyst.

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Figure 4

(a) The disk currents obtained at different rotation speeds for 10wt%Pt∕C Aerogel catalyst at 20mV∕s sweep rate. (b) The mass transport corrected kinetic current for the same catalyst at room temperature and at 1600rpm rotation speed. (c) The Levich-Koutecky plot at 0.4V for the same catalyst.

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Figure 5

The change of Levich constant B as a function of potential

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Figure 6

Ring current at 1600rpm and 20mV∕s sweep rate for 35% Pt∕C Vulcan XC- 72 catalyst with 22% Nafion

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Figure 7

Ring current at 1600rpm and 20mV∕s sweep rate for 46.5% Pt∕C Tanaka catalyst with 22% Nafion

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