Journal ArticleDOI
Polymer Electrolyte Fuel Cell Model
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TLDR
In this paper, an isothermal, one-dimensional, steady-state model for a complete polymer electrolyte fuel cell (PEFC) with a 117 Nation | membrane is presented, which predicts an increase in membrane resistance with increased current density and demonstrates the great advantage of a thinner membrane in alleviating this resistance problem.Abstract:
We present here an isothermal, one-dimensional, steady-state model for a complete polymer electrolyte fuel cell (PEFC) with a 117 Nation | membrane. In this model we employ water diffusion coefficients electro-osmotic drag coefficients, water sorption isotherms, and membrane conductivities, all measured in our laboratory as functions of membrane water content. The model pre.dicts a net-water-per-proton flux ratio of 0.2 H20/H § under typical operating conditions, which is much less than the measured electro-osmotic drag coefficient for a fully hydrated membrane. It also predicts an increase in membrane resistance with increased current density and demonstrates the great advantage of a thinner membrane in alleviating this resistance problem. Both of these predictions were verified experimentally under certain conditions.read more
Citations
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Journal ArticleDOI
Nonlinear frequency response analysis of PEM fuel cells for diagnosis of dehydration, flooding and CO-poisoning
Thomas Kadyk,Richard Hanke-Rauschenbach,Richard Hanke-Rauschenbach,Kai Sundmacher,Kai Sundmacher +4 more
TL;DR: In this article, a sinusoidal perturbation of high amplitude is applied to the fuel cell current and the resulting voltage is analysed using the concept of higher order frequency response functions.
Journal ArticleDOI
Dynamic modeling and analysis of a 20-cell PEM fuel cell stack considering temperature and two-phase effects
Sang-Kyun Park,Song-Yul Choe +1 more
TL;DR: In this article, the authors present a new dynamic model that considers temperature and two-phase effects and analyze these effects on the characteristics of a PEM fuel cell stack, showing that the heat-up time at start-up to achieve a given reference working temperature was inversely proportional to the amplitude of the current density applied and the flow rate and temperature of the coolants.
Journal ArticleDOI
New bio-polymeric membranes composed of alginate-carrageenan to be applied as polymer electrolyte membranes for DMFC
S.D. Pasini Cabello,Sergio Mollá,Nelio Ariel Ochoa,José Marchese,Enrique Giménez,Vicente Compañ +5 more
TL;DR: In this article, a novel polyelectrolyte membranes were prepared from pure solutions of alginate (Alg), carrageenan (Car) and their mixtures, which were crosslinked and sulfonated and then, characterized by several techniques: ionic exchange capacity (IEC), water uptake, mechanical thermal properties, and also functional properties such as methanol permeability and proton conductivity.
Journal ArticleDOI
Dynamic modeling of proton exchange membrane fuel cell using non-integer derivatives
TL;DR: In this paper, the authors proposed a dynamic model of PEMFC, the originality of which lays on the use of non-integer derivatives to model diffusion phenomena, and the model has the advantage of having least number of parameters while being valid on a wide frequency range and allows simulating an accurate dynamic response of the fuel cell.
Journal ArticleDOI
A three-dimensional modeling of transport phenomena of proton exchange membrane fuel cells with various flow fields
TL;DR: In this article, a two-phase three-dimensional numerical transport model based on the two-fluid method for the proton exchange membrane fuel cells (PEMFCs) with parallel flow field, interdigitated flow field and serpentine flow field has been presented to study the cell performance and transport phenomena in the PEMFC.
References
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Electrode materials and processes for energy conversion and storage
TL;DR: In this article, Monte Carlo simulation of the electrochemical faceting mechanism is used to simulate the faceting mechanisms of fuel cells, and an analysis and interpretation of AC impedance data for porous electrodes for extraterrestrial and terrestrial applications.
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