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Accession Number ADA591284
Title Enhanced Stability of PtRu Supported on N-Doped Carbon for the Anode of a DMFC.
Publication Date Sep 2012
Media Count 15p
Personal Author A. Corpuz A. Dameron P. Joghee S. Pylypenko T. Olson
Abstract The performance and long-term stability of a direct-methanol fuel cell (DMFC) employing PtRu supported on nitrogen-modified carbon is compared with that of PtRu/C (Hi-spec 5000). The long-term stability test is carried by means of accelerated degradation testing (ADT) at an anodic potential of 0.8 V vs. DHE for 640h. The initial DMFC performance of the MEA containing PtRu/C (N- doped) is slightly lower than that of the PtRu/C (Hi-SPEC) because of the lower ECSA of the former. After 640h ADT, the anode ECSA loss is found to be 21% and 26% for the PtRu/C (N-doped) and PtRu/C (Hi-SPEC), respectively. Electrochemical analyzes reveal that cathode of the MEA with PtRu/C (N-doped) is less contaminated with Ru. It is further corroborated by post-mortem analysis done by scanning electron microscopy (SEM) associated with EDS, which indicates 4.8 and 8.2 at.% Ru accumulation, respectively, in the cathodes of the PtRu/C (N-doped) and PtRu/C (Hi-SPEC) MEAs after 640h ADT. Although both MEAs sustain anode and cathode ECSA losses, the performance for the PtRu/C (N- doped) MEA is improved by 28% and 8% after initial and long-term ADT, while the performance for the PtRu/C (Hi-SPEC) MEA is improved by 20% after initial and decreased by 3% after long-term ADT.
Keywords Accelerated testing
Adt(Accelerated degradation testing)
Anodes
Carbon
Carbon nanotubes
Catalysis
Catalysts
Degradation
Direct methanol fuel cells
Dmfc(Direct-methanol fuel cells)
Doping
Durability
Electrochemistry
Electrodes
Mea(Membrane electrode assembly)
Nitrogen
Nitrogen doping
Platinum alloys
Ruthenium
Scanning electron microscopy
Stability
Thermogravimetric analysis
Voltammetry


 
Source Agency Non Paid ADAS
NTIS Subject Category 99D - Basic & Synthetic Chemistry
49 - Electrotechnology
97M - Batteries & Components
71N - Nonferrous Metals & Alloys
46E - Structural Mechanics
Corporate Author National Renewable Energy Lab., Golden, CO.
Document Type Journal article
Title Note Journal article.
NTIS Issue Number 1411
Contract Number W911NF-09-1-0528 DE-AC36-08-GO28308

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