Results 171 to 180 of about 11,572 (205)
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The impact of mass transport and methanol crossover on the direct methanol fuel cell
Journal of Power Sources, 1999Abstract The performance of a liquid feed direct methanol fuel cell based on a Nafion® solid polymer electrolyte membrane is reported. The cell utilises a porous Pt–Ru-carbon supported catalyst anode. The effect of cell temperature, air cathode pressure, methanol fuel flow rate and methanol concentration on the power performance of a small-scale (9 ...
Scott K +3 more
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Influence of Methanol Crossover on Cathode Catalyst in Direct Methanol Fuel Cell
ECS Meeting Abstracts, 2017The crossover effect is in the case of direct methanol fuel cell (DMFC) much more significant in comparison with PEMFC. Proof that the methanol crossover is a big issue in this field is a fact that there exist lots of publications describing the innovative procedures how to diminish this phenomenon [1-4].
Zuzana Komárková +2 more
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Open circuit voltage and methanol crossover in DMFCs
Journal of Power Sources, 2002It is difficult to definitely measure the open circuit voltage (OCV) of a direct methanol fuel cell (DMFC). For example, after a cell is changed from a loaded state to a no load, open circuit state, the voltage increases quickly and reaches a peak value in seconds. Some might use this peak voltage as the OCV.
Zhigang Qi, Arthur Kaufman
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Measurement of methanol crossover in direct methanol fuel cell
JSAE Review, 2001In a direct methanol fuel cell (DMFC) with a Nafion membrane, a methanol solution fed to the anode permeates to the cathode. This phenomenon causes the depolarization loss at the cathode and the DMFC performance grows worse. In this research, by continuously measuring the concentration of CH3OH, CO and CO2 in the exhaust gas of the cathode, the amount ...
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The Effect of Methanol Crossover on the Cathode Overpotential of DMFCs
Fuel Cells, 2011AbstractThe effects of methanol crossover on cathode overpotential of direct methanol fuel cells (DMFCs) were investigated by focusing on a mixed potential effect and surface poisoning of the catalyst. Experiments using different membranes and catalyst loadings were performed and compared with a semi‐quantitative model to discuss the main cause of the ...
Takanori Tamaki +4 more
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Evaluation of the Experimental Model for Methanol Crossover in DMFCs
Journal of The Electrochemical Society, 2004Independent transport measurements of carbon dioxide permeation were undertaken to evaluate a standard assumption of attributing cathodic CO 2 flux in direct methanol fuel cells (DMFCs) entirely to methanol crossover. With a humid air cathode at ambient conditions, a DMFC cathode emanated 3.5 to 4 X 10 -8 mol/(cm 2 s) of CO 2 (20 to 25 mA/cm 2 ...
Javit A. Drake +2 more
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Methanol Crossover Effects on Cathode Potential and Performance of a Direct Methanol Fuel Cell
ECS Meeting Abstracts, 2006Abstract not Available.
Wolf Velstich +2 more
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Methanol Crossover Effect for Direct Methanol Fuel Cells: Application of Molecular Simulation
ECS Meeting Abstracts, 2008Abstract not Available.
JungHo Yang, Young Chan Bae
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Volume 5: Energy Systems Analysis, Thermodynamics and Sustainability; NanoEngineering for Energy; Engineering to Address Climate Change, Parts A and B, 2010
One of the major obstacles that currently prevent the widespread applications of DMFCs is the methanol crossover through the proton-exchange membranes (PEM). The present paper discusses the influence of different operating parameters, such as concentration of methanol, pressure, temperature, thickness and equivalent weight of membrane and catalyst ...
Mahmoud Ahmed +2 more
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One of the major obstacles that currently prevent the widespread applications of DMFCs is the methanol crossover through the proton-exchange membranes (PEM). The present paper discusses the influence of different operating parameters, such as concentration of methanol, pressure, temperature, thickness and equivalent weight of membrane and catalyst ...
Mahmoud Ahmed +2 more
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On the consequences of methanol crossover in passive air-breathing direct methanol fuel cells
Journal of Power Sources, 2005Passive direct methanol fuel cells (DMFC) are under development for use in portable power applications due to their enhanced energy density in comparison with active DMFCs. This study has been carried out to understand the unique properties of passive DMFCs, focusing on the internal temperature and the open circuit voltage (OCV), which change as a ...
Beck Kyun Kho +4 more
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