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Accession Number ADA591234
Title Improvement in Direct Methanol Fuel Cell Performance by Treating the Anode at High Anodic Potential.
Publication Date 2014
Media Count 14p
Personal Author A. Corpuz G. Bender K. Wood P. Joghee S. Pylypenko
Abstract This work investigates the effect of a high anodic potential treatment protocol on the performance of a direct methanol fuel cell (DMFC). DMFC membrane electrode assemblies (MEAs) with PtRu/C (Hi-spec 5000) anode catalyst are subjected to anodic treatment (AT) at 0.8 V vs. DHE using potentiostatic method. Despite causing a slight decrease in the electrochemical surface area (ECSA) of the anode, associated with ruthenium dissolution, AT results in significant improvement in DMFC performance in the ohmic and mass transfer regions and increases the maximum power density by w15%. Furthermore, AT improves the long-term DMFC stability by reducing the degradation of the anode catalyst. From XPS investigation, it is hypothesized that the improved performance of AT-treated MEAs is related to an improved interface between the catalyst and Nafion ionomer. Among potential explanations, this improvement may be caused by incorporation of the ionomer within the secondary pores of PtRu/C agglomerates, which generates a percolating network of ionomer between PtRu/C agglomerates in the catalyst layer. Furthermore, the decreased concentration of hydrophobic CF2 groups may help to enhance the hydrophilicity of the catalyst layer, thereby increasing the accessibility of methanol and resulting in better performance in the high current density region.
Keywords Agglomerates
Anodes
At(Anodic treatment)
Carbon
Catalysts
Co stripping voltammetry
Co(Carbon oxides)
Current density
Degradation
Direct methanol fuel cells
Dmfc mea
Dmfc(Direct methanol fuel cells)
Ecsa(Electrochemical surface area)
Electrochemistry
Hydrophilia
Ionomers
Long-term performance
Mea(Membrane electrode assemblies)
Mor polarization
Mor(Methanol oxidation reaction)
Nafion ionomers
Oxidation
Performance(Engineering)
Platinum
Polarization
Power density
Reorganization of nafion ionomer
Ruthenium
Voltammetry
X ray photoelectron spectroscopy


 
Source Agency Non Paid ADAS
NTIS Subject Category 49 - Electrotechnology
97M - Batteries & Components
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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