Results 191 to 200 of about 327,547 (230)
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An Electrochemical Investigation of Methanol Crossover in DMFCs
Journal of Electrochemistry, 2006Methanol crossover and its effect on the open-circuit voltage(OCV) in DMFCs were studied usingcyclic voltammetry and chronoamperometry under stationary condition and at ambient temperature.An H-shapecell was constructed and a simulative DMFC test was carried out to investigate methanol crossover through Na-fion(117 from anode to cathode.The results ...
Meng-di YOU +3 more
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Modeling the Effects of Methanol Crossover on the DMFC
Fuel Cells, 2004AbstractA mathematic model is established to simulate the effects of methanol crossover on the DMFC. The transport and reactions of both oxygen and methanol at the cathode are described and the theory of “parallel electrode reactions” is applied to calculate the cathode over‐potential caused by methanol crossover.
J. Zhang, Y. Wang
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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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Numerical simulation of methanol crossover in flowing electrolyte-direct methanol fuel cell
Journal of Power Sources, 2022Abstract A two-dimensional, comprehensive model for flowing electrode direct methanol fuel cell (FEDMFC) is developed to investigate cell performance and prevention of methanol crossover. Governing equations consists of the electron and proton transfer equations, mass and momentum conservation equation, energy transfer equations, species transfer of ...
Wu Yujing +3 more
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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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A study on the overall efficiency of direct methanol fuel cell by methanol crossover current
Applied Energy, 2010Abstract This paper was presented to determine the methanol crossover and efficiency of a direct methanol fuel cell (DMFC) under various operating conditions such as cell temperature, methanol concentration, methanol flow rate, cathode flow rate, and cathode backpressure.
Chang Sik Lee
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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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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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Influence of Methanol Crossover on the Fuel Utilization of Passive Direct Methanol Fuel Cell
Fuel Cells, 2008AbstractThe effect of methanol crossover on the fuel utilization of a passive direct methanol fuel cell (DMFC) was reported. The results revealed that the Faradaic efficiency decreased from 46.9 to 17.4% when methanol concentration increased from 1.0 to 8.0 mol L–1 at the lower current density 11.1 mA cm–2.
Z -B Wang
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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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