Modeling the Mechano-Chemical Coupling in a Compressed PEMFC MEA with Metallic Bipolar Plates
Bibliographic record
Abstract
Metallic bipolar plates are desirable for the automotive applications of PEMFCs because they offer excellent mechanical properties over the graphite-based bipolar plates. The flow channel configuration using metallic bipolar plates also enhances a stack’s power density. Modeling and simulation of the mechanical behavior of metallic bipolar plates under compression and the impact of mechanical stress-strain on the transport/electrochemical reactions in the membrane electrode assembly (MEA) are reported in this paper. A two-dimensional MEA model with metallic bipolar plates is developed. A two-stage approach with one-way coupling is employed to study the effects of mechanical stress-strain on transport/electrochemistry, namely, solid mechanics of the model is first solved, followed by the solution of coupled heat and mass transport over the deformed geometry obtained from the solid mechanics solution. The transport equations solved include the conservation of mass, species/charged species, and energy. Transport properties such as the porosity, permeability and contact resistance of the MEA components are either obtained from published works or expressed as functions of strain in the model, which are derived from numerical reconstruction of the materials. Furthermore, membrane degradation reactions are modeled as a function of stress to gain insight to the mechano-chemical coupling in the MEA. The comprehensive model was solved using Multiphysics COMSOL software v.5.3. Figure 1 shows the model with typical distributions of von Mises stress over the computational domain (note different scales of stress in the bipolar plates and the MEA), which are obtained by solving solid mechanics of the model. The stress and strain information of the solid mechanics solution as well as the deformed geometry are subsequently passed to the coupled heat and mass transport solution procedure to compute the distributions of species, potentials, and temperature. The present model establishes a platform to numerically investigate the interplay between mechanical responses and transport/electrochemistry in the MEA. Figure 1
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.002 | 0.001 |
| Insufficient payload (model declined to judge) | 0.002 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".