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Accession Number:
ADA616247
Title:
Effect of Nitrogen Post-Doping on a Commercial Platinum-Ruthenium/Carbon Anode Catalyst
Descriptive Note:
Journal article
Corporate Author:
COLORADO SCHOOL OF MINES GOLDEN
Report Date:
2014-02-15
Pagination or Media Count:
15.0
Abstract:
This work investigates the effects of after-the-fact chemical modification of a state-of-the-art commercial carbonsupported PtRu catalyst for direct methanol fuel cells DMFCs. A commercial PtRuC JM HiSPEC-10000 catalyst is post-doped with nitrogen by ion-implantation, where post-doped denotes nitrogen doping after metal is carbonsupported. Composition and performance of the PtRuC catalyst post-modified with nitrogen at several dosages are evaluated using X-ray photoelectron spectroscopy XPS, rotating disk electrode RDE, and membrane electrode assemblies MEAs for DMFC. Overall, implantation at high dosage results in 16 higher electrochemical surface area and enhances performance, specifically in the mass transfer region. Rotating disk electrode RDE results show that after 5000 cycles of accelerated durability testing to high potential, the modified catalyst retains 34 more electrochemical surface area ECSA than the unmodified catalyst. The benefits of nitrogen post-doping are further substantiated by DMFC durability studies carried out for 425 h, where the MEA with the modified catalyst exhibits higher surface area and performance stability in comparison to the MEA with unmodified catalyst. These results demonstrate that post-doping of nitrogen in a commercial PtRuC catalyst is an effective approach, capable of improving the performance of available best-in-class commercial catalysts.
Distribution Statement:
APPROVED FOR PUBLIC RELEASE
