Modeling electrochemical performance in large scale proton exchange membrane fuel cell stacks

Lee, J.H.; Lalk, T. R.; Appleby, A.J.

doi:10.1016/s0378-7753(97)02683-9

Cited by 171 publications

(78 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…This is obviously due to the fact that a larger porosity in the GDL results in a larger oxygen transfer from the gas channel to the catalyst layer, and thus a larger current density is generated. This result supports the fact that the polarization curve in the regime close to the limiting current density is governed by the performance of the mass transfer across both the GDL and the catalyst layer, as proposed in previous studies [22][23][24].…”

Section: Discussionsupporting

confidence: 91%

“…model 3, the limiting current density is the largest. This finding implies that the polarization curve in the regime close to the limiting current density is governed by the performance of the mass transfer across both the GDL and the catalyst layer, as commonly proposed in previous studies [23][24][25]. Similar phenomena were also found by Rho et al [26], who indicated that the drastic drop of voltage is due to the transport limitation of oxygen through the GDL, and a mixed gas with a higher oxygen leads to a higher limiting current density.…”

Section: Physical Explanation Of Performance Modelsupporting

confidence: 67%

“…Models to describe the steady-state performance of the PEM fuel cell have been developed by other workers [1,10,[22][23][24]. The complexity of the model varies considerably.…”

Section: Physical Explanation Of Performance Modelmentioning

confidence: 99%

“…The complexity of the model varies considerably. A typical model proposed by Lee et al [24] presents a comprehensive empirical relation between voltage and current, i.e.…”

Section: Physical Explanation Of Performance Modelmentioning

confidence: 99%

“…(17), first proposed by Kim et al [23], turns out to serve merely as a tool for curve fitting so that the parameters m and n have to be recalculated for any change in the operation conditions. The logarithmic term proposed by Lee et al [24] is a form of the Nernst equation; it is of a more clear physical sense and accounts for the influence of the oxygen fraction on the voltage drop. Namely, a smaller oxygen mass fraction leads to a larger voltage drop, and this is supported by the present results.…”

Section: Physical Explanation Of Performance Modelmentioning

confidence: 99%

See 4 more Smart Citations

Effects of porosity change of gas diffuser on performance of proton exchange membrane fuel cell

Chu

Yeh

Chen

2003

Journal of Power Sources

163

View full text Add to dashboard Cite

An investigation is made of the effects of the change of the porosity of the gas diffuser layer (GDL) on the performance of a proton exchange membrane (PEM) fuel cell. The analysis of fuel cell performance with non-uniform porosity of GDL is a necessity because the presence of liquid water in the GDL leads to a non-uniformly distributed porosity in the GDL. To implement this performance analysis, a half-cell model which considers the oxygen mass fraction distribution in the gas channel, the GDL and the catalyst layer, and the current density and the membrane phase potential in the catalyst layer and the membrane is investigated. Four continuous functions of position are employed to describe the porosity, and differential equations are derived based on oxygen transportation and Ohm's law for proton migration and solved numerically. Results show that a fuel cell embedded with a GDL with a larger averaged porosity will consume a greater amount of oxygen, so that a higher current density is generated and a better fuel cell performance is obtained. This explains partly why fuel cell performance deteriorates significantly as the cathode is flooded with water (i.e. to give a lower effective porosity in the GDL). In terms of the system performance, a change in GDL porosity has virtually no influence on the level of polarization when the current density is medium or lower, but exerts a significant influence when the current density is high. This finding supports the scenario proposed by previous studies that the polarization at high current density corresponds mainly to mass transfer through (or the concentration activation of) the membrane assembly.

show abstract

Section: Discussionsupporting

confidence: 91%

Section: Physical Explanation Of Performance Modelsupporting

confidence: 67%

“…Models to describe the steady-state performance of the PEM fuel cell have been developed by other workers [1,10,[22][23][24]. The complexity of the model varies considerably.…”

Section: Physical Explanation Of Performance Modelmentioning

confidence: 99%

“…The complexity of the model varies considerably. A typical model proposed by Lee et al [24] presents a comprehensive empirical relation between voltage and current, i.e.…”

Section: Physical Explanation Of Performance Modelmentioning

confidence: 99%

Section: Physical Explanation Of Performance Modelmentioning

confidence: 99%

See 3 more Smart Citations

Effects of porosity change of gas diffuser on performance of proton exchange membrane fuel cell

Chu

Yeh

Chen

2003

Journal of Power Sources

163

View full text Add to dashboard Cite

show abstract

Bibliography

2012

Proton Exchange Membrane Fuel Cells Modeling

View full text Add to dashboard Cite

Cost analysis of proton exchange membrane fuel cell systems

Hung

Chen

et al. 2008

AIChE Journal

View full text Add to dashboard Cite

Tradeoff between capital cost and the operating cost can be seen in the design of proton exchange membrane fuel cell systems. The polarization curve indicates that operating in the region of lower current densities implies less operating cost (hydrogen fuel) and higher capital cost (larger membrane electrode assembly area). The opposite effects are observed when one operates in the region of higher current densities. Therefore, an appropriate design should take both factors into account and the optimality depends on the corresponding costs of hydrogen and membrane area. An analytical cost model is constructed to describe such an economic balance in a proton exchange membrane fuel cell system. The objective function of the optimization is the total annual cost. Six scenarios are used to illustrate the optimal design based on the total annual cost as cost and materials factors fluctuate.

show abstract

Modeling electrochemical performance in large scale proton exchange membrane fuel cell stacks

Cited by 171 publications

References 5 publications

Effects of porosity change of gas diffuser on performance of proton exchange membrane fuel cell

Effects of porosity change of gas diffuser on performance of proton exchange membrane fuel cell

Bibliography

Cost analysis of proton exchange membrane fuel cell systems

Contact Info

Product

Resources

About