Por favor, use este identificador para citar o enlazar este ítem:
http://cicy.repositorioinstitucional.mx/jspui/handle/1003/3349| Theoretical analysis of the effect of isotropy on the effective diffusion coefficient in the porous and agglomerated phase of the electrodes of a PEMFC | |
| CARLOS ALBERTO PACHECO PAT GLISERIO ROMELI BARBOSA POOL ALFONSO NAVARRO MONTEJO Luis Carlos Ordóñez López | |
| Acceso Abierto | |
| Atribución-NoComercial-SinDerivadas | |
| https://doi.org/10.1038/s41598-024-57846-w | |
| EFECTIVE TRANSPORT COEICIENT PEMFC FICK’S DIFUSIÓN CATALYST LAYER AGGLOMERATES | |
| In polymer membrane fuel cells (PEMFC), the pore microstructure and the effective diffusion coefficient (Deff) of the catalytic layer have a significant impact on the overall performance of the fuel cell. In this work, numerical methods to simulate PEMFC catalytic layers were used to study the effect of isotropy (Ixy) on the Deff. The proposed methodology studies reconstructed systems by Simulated Annealing imaging with different surface fractions of microstructures composed by two diffusive phases: agglomerates and pores. The Deff is determined numerically by the Finite Volume Method solved for Fick's First Law of Diffusion. The results show that the proposed methodology can effectively quantify the effect of isotropy on the Deff for both diffusion phases. Two trends were obtained in the magnitude of the Deff concerning the change in isotropy: (1) an analytical equation is proposed in this article for Deff≥5%D0 and (2) numerical solutions are determined for Deff<5%D0. In our analytical equation are both a lineal and a logarithmic sweep. When the surface fraction is ∅= 50%, the Deff decreases more linearly than ∅=10% at the beginning of the isotropy change, which indicates that small changes in isotropy in the particulate material modify it drastically; under these conditions the diffusion coefficient in the pore is predominant. (3) When the surface fraction is less than 50%, the Deff decreases more exponentially at the beginning and more linearly at the end of the isotropy change, which shows that small isotropy changes in the bar-aligned material drastically alter it. In this trend, diffusion in the agglomerate is less affected by isotropy. The proposed methodology can be used as a design tool to improve the mass transport in porous PEMFC electrodes. © The Author(s) 2024. | |
| 2024 | |
| Artículo | |
| Scientific Reports, 14(1), 7299, 2024. | |
| Inglés | |
| ENERGÍA | |
| Versión publicada | |
| publishedVersion - Versión publicada | |
| Aparece en las colecciones: | Artículos de Investigación Arbitrados |
Cargar archivos:
| Fichero | Tamaño | Formato | |
|---|---|---|---|
| 2024_C._Pacheco.pdf | 2.4 MB | Adobe PDF | Visualizar/Abrir |