The Experts below are selected from a list of 36 Experts worldwide ranked by ideXlab platform
Alexandra M.f.r. Pinto - One of the best experts on this subject based on the ideXlab platform.
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Simulation of Membrane Chemical Degradation in a proton exchange Membrane fuel cell by computational fluid dynamics
International Journal of Hydrogen Energy, 2021Co-Authors: Rui Ferreira, D.s. Falcão, Alexandra M.f.r. PintoAbstract:Abstract Membrane Chemical Degradation is a major contributor to the still limited lifetime of proton exchange Membrane (PEM) fuel cells. In the present work, this phenomenon is simulated by computational fluid dynamics (CFD). The main advantage of the CFD model is that it can provide the Degradation profile across the cell active area. Results reveal that Degradation accelerates when voltage, temperature and pressure are increased and when reactants humidity and Membrane thickness are decreased. Moreover, Membrane deterioration is found to be more severe where oxygen pressure is higher, and more heterogeneous when oxygen distribution is less uniform. Generally, conditions that increase current production and thus oxygen depletion along the cell increase Degradation heterogeneity. The flow field design is also found to influence the Membrane Degradation spatial profile. The modeling strategy here applied, the incorporation of a Degradation sub-model into a general-purpose CFD code, can be used to include other Degradation mechanisms.
Bernard Normand - One of the best experts on this subject based on the ideXlab platform.
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a coupling approach between metallic bipolar plates corrosion and Membrane Chemical Degradation in the proton exchange Membrane fuel cells
International Journal of Hydrogen Energy, 2021Co-Authors: I Elferjani, G Serre, B Terovanessian, Bernard NormandAbstract:Abstract The Nafion Membrane's Chemical Degradation by the Fenton mechanism involves the presence of ferrous ions Fe2+ but the detrimental concentration is not well known. These ions could be generated either from the balance of plant or from the bipolar plates' corrosion. As an attempt to describe the link between the two mechanisms, the Membrane's Degradation and the bipolar plates' corrosion were investigated. Our work is based on experimental and modelling approaches. We start with a parametric corrosion study allowing the determination of the Fe2+ flux using a Look-Up Table. The second step is the modelling of the Fe2+ effect on the Membrane Degradation. The third is the modelling of ionic species transport between the bipolar plates and the Membrane. The final coupled Degradation model is implemented in a PEMFC performance simulator based on the Matlab/Simulink® platform. The model is used to simulate the Degradation mechanism during NEDC (New European Driving Cycle).
Alejandro A. Franco - One of the best experts on this subject based on the ideXlab platform.
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A Multiparadigm Modeling Investigation of Membrane Chemical Degradation in PEM Fuel Cells
Journal of The Electrochemical Society, 2015Co-Authors: Matias A. Quiroga, Kourosh Malek, Alejandro A. FrancoAbstract:We report a multi-paradigm model of the Membrane Chemical Degradation in Polymer Electrolyte Membrane Fuel Cells (PEMFCs), by combining Coarse-Grained Molecular Dynamics (CGMD) and a multiscale cell performance model. CGMD is used to generate structural databases that relate the amount of detached (degraded) ionomer sidechains with the water content and the resulting PEM meso-microporous structure. The multiscale cell performance model describes the electroChemical reactions and transport mechanisms occuring in the electrodes from an on-the-fly coupling between Kinetic Monte Carlo (KMC) sub-models parametrized with Density Functional Theory (DFT) data and (partial differential equations-based) continuum sub-models. Furthermore, the performance model includes a kinetic PEM Degradation sub-model which integrates the CGMD database. The cell model also predictstheinstantaneousPEMsidechaincontentandconductivityevolutionateachtimestep.Thecouplingofthesediversemodeling paradigms allows one to describe the feedback between the instantaneous cell performance and the intrinsic Membrane Degradation processes. This provides detailed insights on the Membrane Degradation (sidechain detachment as well as water reorganization within the PEM) during cell operation. This novel modeling approach opens interesting perspectives in engineering practice to predict materials Degradation and durability as a function of the initial Chemical composition and structural properties in electroChemical energy conversion and storage devices. © The Author(s) 2015. Published by ECS. This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 License (CC BY, http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse of the work in any
Rui Ferreira - One of the best experts on this subject based on the ideXlab platform.
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Simulation of Membrane Chemical Degradation in a proton exchange Membrane fuel cell by computational fluid dynamics
International Journal of Hydrogen Energy, 2021Co-Authors: Rui Ferreira, D.s. Falcão, Alexandra M.f.r. PintoAbstract:Abstract Membrane Chemical Degradation is a major contributor to the still limited lifetime of proton exchange Membrane (PEM) fuel cells. In the present work, this phenomenon is simulated by computational fluid dynamics (CFD). The main advantage of the CFD model is that it can provide the Degradation profile across the cell active area. Results reveal that Degradation accelerates when voltage, temperature and pressure are increased and when reactants humidity and Membrane thickness are decreased. Moreover, Membrane deterioration is found to be more severe where oxygen pressure is higher, and more heterogeneous when oxygen distribution is less uniform. Generally, conditions that increase current production and thus oxygen depletion along the cell increase Degradation heterogeneity. The flow field design is also found to influence the Membrane Degradation spatial profile. The modeling strategy here applied, the incorporation of a Degradation sub-model into a general-purpose CFD code, can be used to include other Degradation mechanisms.
I Elferjani - One of the best experts on this subject based on the ideXlab platform.
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a coupling approach between metallic bipolar plates corrosion and Membrane Chemical Degradation in the proton exchange Membrane fuel cells
International Journal of Hydrogen Energy, 2021Co-Authors: I Elferjani, G Serre, B Terovanessian, Bernard NormandAbstract:Abstract The Nafion Membrane's Chemical Degradation by the Fenton mechanism involves the presence of ferrous ions Fe2+ but the detrimental concentration is not well known. These ions could be generated either from the balance of plant or from the bipolar plates' corrosion. As an attempt to describe the link between the two mechanisms, the Membrane's Degradation and the bipolar plates' corrosion were investigated. Our work is based on experimental and modelling approaches. We start with a parametric corrosion study allowing the determination of the Fe2+ flux using a Look-Up Table. The second step is the modelling of the Fe2+ effect on the Membrane Degradation. The third is the modelling of ionic species transport between the bipolar plates and the Membrane. The final coupled Degradation model is implemented in a PEMFC performance simulator based on the Matlab/Simulink® platform. The model is used to simulate the Degradation mechanism during NEDC (New European Driving Cycle).