Unravelling the complexities of CO2 tolerance at PtRu/C and PtMo/C
Unravelling the complexities of CO2 tolerance at PtRu/C and PtMo/C
The CO2 tolerance exhibited by PtRu/C is known to be greater than that of PtMo/C catalysts in contrast to the trend in CO tolerance. In this manuscript the origins of these differences are investigated in a cyclic voltammetric investigation of the potential dependence of the poisoning of Pt/C, PtRu/C and PtMo/C anode catalyst electrodes in a miniature PEM fuel cell when exposed to pure CO, pure CO2, or 25% CO2 in H2. The results show that the difference in the mechanisms of improved CO tolerance, compared to a Pt/C reference catalyst, of PtRu and PtMo explain the decreased CO2 tolerance of PtMo compared to PtRu; at PtRu the mechanism is intrinsic (water activation at Ru sites), whilst at PtMo the mechanism relies on the turn-over the Mo(IV/VI) redox couple.
72-78
Russell, Andrea E.
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Ball, Sarah C.
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Maniguet, Stephanie
cd69841b-03b4-4c98-9ef7-141d56e67228
Thompsett, David
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19 September 2007
Russell, Andrea E.
b6b7c748-efc1-4d5d-8a7a-8e4b69396169
Ball, Sarah C.
08b43f03-eb51-4cf9-b228-2fc79c90b358
Maniguet, Stephanie
cd69841b-03b4-4c98-9ef7-141d56e67228
Thompsett, David
2fba717f-67ed-4999-b400-3c3a0681778f
Russell, Andrea E., Ball, Sarah C., Maniguet, Stephanie and Thompsett, David
(2007)
Unravelling the complexities of CO2 tolerance at PtRu/C and PtMo/C.
Journal of Power Sources, 171 (1), .
(doi:10.1016/j.jpowsour.2007.02.050).
Abstract
The CO2 tolerance exhibited by PtRu/C is known to be greater than that of PtMo/C catalysts in contrast to the trend in CO tolerance. In this manuscript the origins of these differences are investigated in a cyclic voltammetric investigation of the potential dependence of the poisoning of Pt/C, PtRu/C and PtMo/C anode catalyst electrodes in a miniature PEM fuel cell when exposed to pure CO, pure CO2, or 25% CO2 in H2. The results show that the difference in the mechanisms of improved CO tolerance, compared to a Pt/C reference catalyst, of PtRu and PtMo explain the decreased CO2 tolerance of PtMo compared to PtRu; at PtRu the mechanism is intrinsic (water activation at Ru sites), whilst at PtMo the mechanism relies on the turn-over the Mo(IV/VI) redox couple.
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Published date: 19 September 2007
Additional Information:
Presented at Scientific Advances in Fuel Cell Systems, Turin, Italy, 13-14 September 2006
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Local EPrints ID: 146397
URI: http://eprints.soton.ac.uk/id/eprint/146397
ISSN: 0378-7753
PURE UUID: 179e7689-77c5-48d8-98c8-8880bf783f3a
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Date deposited: 03 Jun 2010 10:39
Last modified: 14 Mar 2024 02:41
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Author:
Sarah C. Ball
Author:
Stephanie Maniguet
Author:
David Thompsett
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