Results 201 to 210 of about 327,547 (230)
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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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Evaluation of methanol crossover in proton-conducting polyphosphazene membranes
Materials Letters, 2002 A diffusion cell was developed to evaluate the methanol crossover for a novel class of polyphosphazene electrolyte membranes. It was found that the methanol diffusion coefficients of phenyl phosphonic acid functionalized poly[aryloxyphosphazene ...
Xiangyang Zhou +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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An Electroanalytical Study of Methanol Crossover Through Nafion 117 Membrane
2nd International Conference on Fuel Cell Science, Engineering and Technology, 2004The proton exchange membrane direct methanol fuel cells (PEMDMFC) shows considerably lower performance than the hydrogen fuel cell because of inefficient methanol oxidation and the crossover of the methanol through the membrane that separates the anode from the cathode.
F. Kadirgan, O. Savadogo
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Methanol Crossover through Modified Nafion Proton Exchange Membrane
Russian Journal of Electrochemistry, 2004The proton exchange membrane direct methanol fuel cells (PEMDMFC) show considerably lower performance than the hydrogen fuel cell because of inefficient methanol oxidation and the crossover of methanol through the membrane that separates the anode from the cathode.
F. Kadirgan, O. Savadogo
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Comparison of Methanol Crossover among Four Types of Nafion Membranes
Journal of The Electrochemical Society, 2004The crossover behavior of methanol through Nafion 112, 117, 1035, and 1135 membranes using cyclic voltammetry (CV) was studied at 25°C and the results compared. The multiple CV technique was used to study the electrochemical characteristics of the crossed methanol during this crossover.
J. Ling, O. Savadogo
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Journal of The Electrochemical Society, 2008
We developed a cell voltage model as a function of the current density response of the direct methanol fuel cell (DMFC). The impact on cell performance by methanol crossover, which lowers the cell performance, is discussed. We employ a srmethanol activity term to take into account the methanol crossover effect.
Jung Ho Yang, Young Chan Bae
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We developed a cell voltage model as a function of the current density response of the direct methanol fuel cell (DMFC). The impact on cell performance by methanol crossover, which lowers the cell performance, is discussed. We employ a srmethanol activity term to take into account the methanol crossover effect.
Jung Ho Yang, Young Chan Bae
openaire +1 more source