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Research Papers

Improved CO Tolerance With PtRu Anode Catalysts in ABPBI Based High Temperature Proton Exchange Membrane Fuel Cells

[+] Author and Article Information
Christian Oettel

 Max Planck Institute for Dynamics of Complex Technical Systems, Magdeburg, Sandtorstrasse 1, 39106 Magdeburg, Germany

Liisa Rihko-Struckmann

 Max Planck Institute for Dynamics of Complex Technical Systems, Magdeburg, Sandtorstrasse 1, 39106 Magdeburg, Germanyrihko@mpi-magdeburg.mpg.de

Kai Sundmacher

 Max Planck Institute for Dynamics of Complex Technical Systems, Magdeburg, Sandtorstrasse 1, 39106 Magdeburg, Germany; Otto-von-Guericke University Magdeburg, Universitätsplatz 2, 39106 Magdeburg, Germany

J. Fuel Cell Sci. Technol 9(3), 031009 (Apr 27, 2012) (7 pages) doi:10.1115/1.4006474 History: Received November 02, 2011; Revised February 14, 2012; Published April 27, 2012; Online April 27, 2012

The potential to improve the CO tolerance of a high temperature proton exchange membrane fuel cell (HT-PEMFC) was investigated by introducing a platinum-ruthenium alloy as anode catalyst. The electrolyte was a H3 PO4 doped poly-2,5-benzimidazole polymer (ABPBI). The experiments were carried out at the temperatures between 403 and 443 K with a CO concentration in the H2 feed gas between 0 and 6.5 vol%. The alloy anode catalyst lowers significantly the negative influence of CO in the feed, exceeding the known temperature dependent CO poisoning mitigation in HT-PEMFCs. It was found that the voltage loss of a HT-PEMFC with PtRu anode catalyst was lower than that of a similar cell equipped with Pt anode. The dynamic cell voltage response to a current step was analyzed under CO influence, as well. The PtRu bimetallic anode electrode was found to lower the observed voltage overshoot behavior after a current step, if compared to conventional Pt anode.

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Copyright © 2012 by American Society of Mechanical Engineers
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Figures

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Figure 1

Polarization curves of the Ru-free and Ru containing HT-PEMFCs, recorded with 85 vol% H2 and no CO within the anode feed gas at a temperature of 423 K

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Figure 2

Polarization curves of the Ru-free and Ru containing HT-PEMFCs, recorded with 85 vol% H2 and 3.6 vol% CO in the anode feed gas at a temperature of 423 K

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Figure 3

The CO voltage loss as a function of the CO feed gas concentration, shown for: (a) Ru-free HT-PEMFC, at a current density of i = 0.51 A cm−2 and an operation temperature of 423 and 443 K; (b) Ru HT-PEMFC at a current density of i = 0.51 A cm−2 and an operation temperature of 423 and 443 K; (c) Ru-free HT-PEMFC and Ru HT-PEMFC at a current density of i = 0.51 A cm−2 and an operation temperature of 443 K

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Figure 4

The CO voltage loss as a function of the operation temperature, shown for the Ru-free HT-PEMFC and Ru HT-PEMFC operated with 2.2 and 3.6 vol% CO in the anode feed gas

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Figure 5

The voltage response function of the Ru-free HT-PEMFC and the Ru HT-PEMFC operated at T = 443 K with 0.0 and 5.1 vol% CO in the anode feed gas, after a current step from open circuit conditions to i = 0.01 A cm−2

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Figure 6

The CO voltages loss response function of the Ru-free HT-PEMFC operated at T = 443 K with 5.1 vol% CO in the anode feed gas, after a current step from open circuit conditions to i = 0.01 A cm−2

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Figure 7

The voltage response function of the Ru-free HT-PEMFC and the Ru HT-PEMFC operated at T = 443 K with 0.0 and 5.1 vol% CO in the anode feed gas, after a current step from i = 0.41 A cm−2 to i = 0.51 A cm−2

Grahic Jump Location
Figure 8

The CO voltage loss response function of the Ru-free HT-PEMFC and the Ru HT-PEMFC operated at T = 443 K with 0.0 and 5.1 vol% CO in the anode feed gas, after a current step from i = 0.41 A cm−2 to i = 0.51 A cm−2

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