Gotowe bibliografie tematyczne / Couche de diffusion (GDL)

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Gotowa bibliografia na temat „Couche de diffusion (GDL)”

Autor: Grafiati

Data publikacji: 23 listopada 2024

Data aktualizacji: 31 lipca 2025

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Artykuły w czasopismach na temat "Couche de diffusion (GDL)"

Ji, Sheng Zheng, Zhuang Song, and Ying He. "Study on Diffusion Characteristics of Liquid Water in Gas Diffusion Layer by Lattice Boltzmann Method." International Journal of Engineering Research in Africa 71 (September 18, 2024): 1–16. http://dx.doi.org/10.4028/p-3yl8ms.

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The gas diffusion layer (GDL) is a crucial component of Proton Exchange Membrane Fuel Cells (PEMFC), water flooding will occur during the operation of PEMFC, resulting in performance degradation, and its water management plays a significant role in PEMFC performance. To investigate the transport mechanism of liquid water in GDL, the lattice Boltzmann method to simulate the behavior of GDL droplets using the 'random reconstruction' method. The accuracy of this model by calculating the tortuosity and comparing it with reported results in literature. The effects of different GDL structural parame

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Alishahi, Marzieh, Claire McCague, and Majid Bahrami. "Evaluation of Porous Media Gas Diffusion Models for PEMFC Applications." ECS Meeting Abstracts MA2022-01, no. 39 (2022): 1762. http://dx.doi.org/10.1149/ma2022-01391762mtgabs.

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Abstract. Polymer electrolyte membrane fuel cells (PEMFCs) are considered as zero emission power sources for transportation and stationary power purposes. The membrane electrode assembly (MEA) is the core of PEMFC and is composed of a gas diffusion layer (GDL), catalyst layer (CL) and proton exchange membrane (PEM). GDL is a carbon-based, fibrous porous medium that simultaneously provides a path for heat, mass and electron transport, as well as providing a mechanically robust support for the CL. The gas diffusion in the GDL can be estimated by Fick’s law where the effective diffusion coefficie

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Ringström, Marcus, Rakel Wreland Lindström, Göran Lindbergh, and Henrik Ekström. "Experimental Characterization of Anisotropic Mechanical and Thermal Properties of Gas Diffusion Layers." ECS Meeting Abstracts MA2022-01, no. 37 (2022): 1645. http://dx.doi.org/10.1149/ma2022-01371645mtgabs.

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Gas diffusion layer (GDL) is a vital component in proton exchange membrane fuel cells (PEMFC) due its main functions to conduct electrons and heat between the adjacent fuel cell components, provide preferential pathways for product water removal and to provide uniform reactant gas flow distribution to the electrode surface. Because of the anisotropic GDL microstructure, the transport properties vary in the through-plane and in-plane direction. Furthermore, during fuel cell stack assembly pressures exerted on the flowfield land compress the GDL under land cause changes of the GDL microstructure

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Berger, Anne, Yen-Chun Chen, Jacqueline Gatzemeier, Felix N. Buechi, and Hubert Andreas Gasteiger. "Importance of Directed Water Removal: Intruding Microporous Layer Material into the Gas Diffusion Layer Substrate." ECS Meeting Abstracts MA2023-02, no. 37 (2023): 1766. http://dx.doi.org/10.1149/ma2023-02371766mtgabs.

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Proton exchange membrane fuel cells (PEMFC) are an essential component of net zero emission scenarios by the International Energy Agency (IEA), most prominent in the heavy-duty transportation sector.[1-2] During operation, the PEMFC is subject to different operating conditions, particularly wet conditions where liquid water removal is crucial. It was observed that a microporous layer (MPL), commonly consisting of a carbon component (e.g. carbon black, carbon fibers) and a hydrophobic binder (e.g. PTFE), placed at the interface of the catalyst layer (CL) and the gas diffusion layer substrate (G

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Yang, Mingyang, Aimin Du, Jinling Liu, and Sichuan Xu. "Lattice Boltzmann Method Study on Liquid Water Dynamic inside Gas Diffusion Layer with Porosity Distribution." World Electric Vehicle Journal 12, no. 3 (2021): 133. http://dx.doi.org/10.3390/wevj12030133.

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The gas diffusion layer (GDL) plays an important role in the mass transfer process during proton exchange membrane fuel cell (PEMFC) operation. However, the GDL porosity distribution, which has often been ignored in the previous works, influences the mass transfer significantly. In this paper, a 2D lattice Boltzmann method model is employed to simulate the liquid water transport process in the real GDL (considered porosity distribution) and the ideal GDL (ignore porous distribution), respectively. It was found that the liquid water transport in the real GDL will be significantly affected by th

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Yoshikawa, Makoto, Kotaro Yamamoto, Zhiyun Noda, et al. "Self-Supporting Microporous Layer for Polymer Electrolyte Fuel Cells." ECS Transactions 112, no. 4 (2023): 83–91. http://dx.doi.org/10.1149/11204.0083ecst.

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The gas diffusion layer (GDL) used in a PEFC is thicker than the electrode catalyst layer and electrolyte membrane. Thinning down the GDL can reduce gas diffusion resistance and volumetric power density of PEFC stacks. In this study, MPL/GDL is prepared by printing microporous layers (MPLs) on carbon meshes of several tens of micrometers thick as substrates for thin-layer GDLs. Through various current-voltage and overvoltage measurements and microstructural analysis of the cells using these thin-layer MPL/GDLs, cell performance has been improved, equivalent to that of the state of the MPL/GDL.

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Yilmaz, Abdurrahman, Siddharth Komini Babu, Ugur Pasaogullari, Jacob S. Spendelow, and Rangachary Mukundan. "Optimization of the Cathode Gas Diffusion Layer Also Matters for Water Electrolyzers." ECS Meeting Abstracts MA2022-02, no. 40 (2022): 1491. http://dx.doi.org/10.1149/ma2022-02401491mtgabs.

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Polymer electrolyte water electrolyzers (PEMWEs) are a promising technology for the storage of energy from intermittent renewable sources such as wind and solar. PEMWEs split water into hydrogen and oxygen electrochemically. Under typical operating conditions, the hydrogen evolution reaction (HER) in the cathode is not limited by reactant transport, since it is supplied by the rapid transport of protons from the polymer electrolyte and electrons from the external circuit. There are very limited studies on the role of the cathode gas diffusion layer (GDL), typically a carbon-paper based layer.

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Berger, Anne, Michael Striednig, Christoph Simon та Hubert A. Gasteiger. "Determination of the τ/ε-Ratio for Gas Diffusion Substrates and Microporous Layers in a Proton Exchange Membrane Fuel Cell". Journal of The Electrochemical Society 172, № 1 (2025): 014508. https://doi.org/10.1149/1945-7111/ada63e.

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An understanding of the GDL properties is crucial for high-current-density operation of proton exchange membrane fuel cells (PEMFCs). The parameters porosity ( ε ) and tortuosity ( τ ) directly link the theoretical diffusivity in free space and the effective diffusivity in the structure. The τ / ε -ratio is therefore an important descriptor for the gas diffusion in a porous network. This study characterizes the τ / ε -ratio for gas diffusion layer substrate (GDL-S) materials from two suppliers (Toray, Freudenberg) and for one microporous layer (MPL) using limiting current measurements in an op

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Jung, Sung Yong, Jooyoung Park, Hanwook Park, Hwanyeong Oh, and Jong Woon Moon. "Degradation Effect of Gas Diffusion Layer on Water Transport in Polymer Electrolyte Membrane Fuel Cell." ECS Meeting Abstracts MA2022-01, no. 41 (2022): 2426. http://dx.doi.org/10.1149/ma2022-01412426mtgabs.

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Hydrogen is converted to electric power by proton exchange membrane fuel cells (PEMFCs), which have received significant attention for transportation applications because of their high energy efficiency. In order to ensure the long-term stability, understanding about their long-term durability is essential because the operating performance deteriorates over time. Gas diffusion layers (GDLs) manage the transport of water generated from the CL during chemical reactions, and the degradation of the GDL significantly deteriorate the fuel cell performance. Compared to the fresh GDL, the water transp

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Truong, Van Men, Ngoc Bich Duong, and Hsiharng Yang. "Effect of Gas Diffusion Layer Thickness on the Performance of Anion Exchange Membrane Fuel Cells." Processes 9, no. 4 (2021): 718. http://dx.doi.org/10.3390/pr9040718.

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Gas diffusion layers (GDLs) play a critical role in anion exchange membrane fuel cell (AEMFC) water management. In this work, the effect of GDL thickness on the cell performance of the AEMFC was experimentally investigated. Three GDLs with different thicknesses of 120, 260, and 310 µm (denoted as GDL-120, GDL-260, and GDL-310, respectively) were prepared and tested in a single H2/O2 AEMFC. The experimental results showed that the GDL-260 employed in both anode and cathode electrodes exhibited the best cell performance. There was a small difference in cell performance for GDL-260 and GDL-310, w

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Rozprawy doktorskie na temat "Couche de diffusion (GDL)"

Roussillo, Bertrand. "Préparation, caractérisation et modélisation de fibres carbonnées par électrofilage comme couche de diffusion des gaz (GDL) pour pile à combustible PEMFC." Electronic Thesis or Diss., Université de Toulouse (2023-....), 2024. http://www.theses.fr/2024TLSEP081.

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Les piles à combustible PEMFC représentent l'avenir des véhicules électriques lourds. L'amélioration des performances, des coûts et de la durabilité de ses composants constitue les objectifs clé pour cette technologie. La couche de diffusion des gaz (GDL) joue un rôle essentiel dans les performances de la PEMFC. En effet, elle assure le transport des fluides, les conductivités électriques et thermiques, et réduit le noyage de la cathode tout en maintenant la membrane hydratée [1].La fabrication et la caractérisation des GDL électrofilées (eGDL) sont étudiées. L'électrofilage permet de créer de

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Desplobain, Sébastien. "Étude et réalisation de couches de diffusion de gaz en silicium poreux appliquées à la fabrication de micropiles à hydrogène." Thesis, Tours, 2009. http://www.theses.fr/2009TOUR4030/document.

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L'objectif de cette thèse a consisté à étudier des procédés de fabrication de couches de diffusion de gaz (GDL) en silicium poreux appliqués à l'intégration de micropiles à combustible de type PEMFC sur plaquette de silicium. Deux types de couches ont été étudiés : sur surface plane (2D) et sur surface texturée (3D). Les couches de diffusion de gaz ont été réalisées par l'anodisation de silicium de type N fortement résistif. Une localisation des motifs poreux a été obtenue par ouverture d'un masque en polysilicium sur oxyde thermique de silicium. Seules les GDL 2D entièrement macroporeuses ass

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Lenormand, Pascal. "Etude de l'évolution microstructurale de précurseurs d'oxyde de zirconium à l'état de gel, xérogel, couche mince et aérosol par diffusion de rayons X." Limoges, 2001. http://www.theses.fr/2001LIMO0043.

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Dans ce travail, nous nous intéressons aux précurseurs de zircone synthétisés par voie sol-gel: gel,xérogel,couche mince et aérogel. L'objectif est de préciser le rôle spécifique des différents états d'agrégation des particules élémentaires constituant ces précurseurs sur l'évolution de leur microstructure au cours de traitements thermiques à basse température. La technique de caractérisation majoritairement utilisée est la diffusion centrale des rayons X. Dans le cas des couches minces, la géométrie du montage expérimental a été adaptée au cas de l'incidence rasante et un appareillage origina

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Sole, Joshua David. "Investigation of Novel Gas Diffusion Media for Application in Pem Fuel Cell Ribbon Assemblies." Thesis, Virginia Tech, 2005. http://hdl.handle.net/10919/36392.

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A new type of fuel cell architecture, the fuel cell ribbon, is presented. The fuel cell ribbon architecture relies on the gas diffusion layer (GDL) to conduct electrical current in-plane to adjacent cells or collector terminals. The potential advantages of the fuel cell ribbon architecture with respect to conventional fuel cell stacks include reduced manufacturing costs, reduced weight, reduced volume, and reduced component cost. The critical component of fuel cell ribbon assemblies, the gas diffusion media, is investigated herein. Analytical models which focus on the electrical loses within t

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Denicourt, Normand. "La diffusion latérale des phospholipides en couche monomoléculaire." Thèse, Université du Québec à Trois-Rivières, 1990. http://depot-e.uqtr.ca/6782/1/000587544.pdf.

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Morgan, Jason. "Towards an Understanding of the Gas Diffusion Layer in Polymer Electrolyte Membrane Fuel Cells." Digital WPI, 2016. https://digitalcommons.wpi.edu/etd-dissertations/555.

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The gas diffusion layer (GDL) is one of the key components in a polymer electrolyte membrane (PEM) fuel cell. It performs several functions including the transport of reactant gases and product water to and from the catalyst layer, conduction of both electrons and heat produced in the catalyst layer, as well as mechanical support for the membrane. The overarching goal of this work is to thoroughly examine the GDL structure and properties for use in PEM fuel cells, and more specifically, to determine how to characterize the GDL experimentally ex-situ, to understand its performance in-situ, and

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Neff, David N. "Integrated Bipolar Plate – Gas Diffusion Layer Design for Polymer Electrolyte Membrane Fuel Cells." Wright State University / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=wright1261092610.

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Caston, Terry Brett. "Design of a gas diffusion layer for a polymer electrolyte membrane fuel cell with a graduated resistance to flow." Thesis, Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/34790.

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Due to escalating energy costs and limited fossil fuel resources, much attention has been given to polymer electrolyte membrane (PEM) fuel cells. Gas diffusion layers (GDLs) play a vital role in a fuel cell such as (1) water removal, (2) cooling, (3) structural backing, (4) electrical conduction and (5) transporting gases towards the active catalyst sites where the reactions take place. The power density of a PEM fuel cell in part is dependent upon how uniform the gases are distributed to the active sites. To this end, research is being conducted to understand the mechanisms that influence

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El, Khoury Lara. "Diffusion Raman résonante des rayons X de molécules excitées en couche profonde." Paris 6, 2008. http://www.theses.fr/2008PA066305.

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Nous avons réalisé des mesures expérimentales de diffusion résonante de rayon X sur des molécules chlorées isolées en phase gazeuse (HCl, CH3Cl). Nous avons utilisé le rayonnement synchrotron dans le domaine des rayons X ‘tendres’ (1-10 keV) comme source d’excitation. L’intérêt de cette gamme d’énergie réside dans la durée de vie femtoseconde, voir sub-femtoseconde de la lacune créée après absorption d’un photon. La spectroscopie de diffusion des rayons X permet de mettre à profit ce temps caractéristique, introduit dans l’état intermédiaire, pour sonder dans cette échelle de temps, la dynamiq

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Dieudonne, Eva. "Diffusion électromagnétique par des objets inhomogènes : de la couche à la structure complexe." Thesis, Aix-Marseille, 2015. http://www.theses.fr/2015AIXM4304/document.

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Les objets électromagnétiques sont conçus en considérant des matériaux aux propriétés radio-électriques (permittivité, perméabilité) homogènes. Néanmoins, lors de leur réalisation les matériaux réels peuvent présenter des fluctuations de ces propriétés. Ce travail porte sur la mise au point d'outils capables d'estimer le champ diffusé produit par les fluctuations. Trois méthodes ont été mises au point : EMFORS, ABE et RECY pour la détermination du champ diffusé par des fluctuations de permittivité et de perméabilité. La modélisation de la contribution des fluctuations de perméabilité est une a

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Części książek na temat "Couche de diffusion (GDL)"

Calay, Rajnish Kaur. "Gas Diffusion Layer (GDL)." In Encyclopedia of Membranes. Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-40872-4_1683-2.

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Gallo Stampino, Paola, Giovanni Dotelli, Luca Omati, P. Fracas, D. Brivio, and P. Grassini. "Carbon-Based Textiles as Gas Diffusion Layers (GDL) for Polymer Fuel Cells." In Smart Textiles. Trans Tech Publications Ltd., 2008. http://dx.doi.org/10.4028/3-908158-17-6.128.

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Amadane, Yassine, Hamid Mounir, Abdellatif El Marjani, and Mohamed Karim Ettouhami. "The Effect of Gas Diffusion Layer (GDL) Porosity Variation on Oxygen Distribution Along the PEM Fuel Cell." In Lecture Notes in Electrical Engineering. Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-36475-5_27.

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Bongaarts, John, and Dennis Hodgson. "Socio-Economic Determinants of Fertility." In Fertility Transition in the Developing World. Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-11840-1_4.

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AbstractThe fertility levels of developing countries correlate with many socio-economic variables including girls’ or women’s education, infant and child mortality, GDP/capita, and percent urban. To determine whether these correlations are causal or simply due to collinearity we rely on multivariate fixed effect regression analyses. The results identify women’s education as the most important determinant of fertility, which is consistent with past studies. Next, we examine the relationship between education and fertility over the course of transitions from 1960 and 2015 in individual developin

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Wang, Yulin, and Haokai Xu. "Microstructure Reconstruction and Gas-Liquid Two-Phase Transport Mechanism within Porous Electrodes of PEM Fuel Cells." In Transport Perspectives for Porous Medium Applications [Working Title]. IntechOpen, 2023. http://dx.doi.org/10.5772/intechopen.1003240.

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The structure of porous media is composed of skeleton particles and pores. Its micro-pores and solid skeleton characteristics lead to the capillary fingering movement of fluid in its porous media driven by capillary pressure. Currently, the methods of constructing porous media are mainly random construction and multi-scale imaging construction. The porous structure constructed by these two methods can show the real microstructure characteristics. The research on multiphase flow in microporous structure mainly includes VOF, MC, LBM, and other methods. In this chapter, taking the classic porous

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Streszczenia konferencji na temat "Couche de diffusion (GDL)"

Iwasaki, Daigo, Yoshio Utaka, Yutaka Tasaki, and Shixue Wang. "Oxygen Diffusion Characteristics of Gas Diffusion Layers With Moisture." In ASME 2008 6th International Conference on Nanochannels, Microchannels, and Minichannels. ASMEDC, 2008. http://dx.doi.org/10.1115/icnmm2008-62106.

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The mass transfer characteristics of the gas diffusion layer (GDL) in a polymer electrolyte fuel cell (PEFC) are closely related to the performance. In this study, the oxygen diffusivity of paper and cloth type porous media, which are generally used as GDLs, were measured with respect to liquid water content, using experimental apparatus consisting of an oxygen sensor based on a galvanic battery. Paper type porous media, both non treated and hydrophilic treated, and the cloth type porous media with non treated surface were used as GDL specimens. The porosity of both specimens was almost the sa

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Feser, J. P., A. K. Prasad, and S. Advani. "In Plane Permeability Measurements for Gas Diffusion Layers." In ASME 2005 3rd International Conference on Fuel Cell Science, Engineering and Technology. ASMEDC, 2005. http://dx.doi.org/10.1115/fuelcell2005-74101.

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A radial flow device was fabricated to experimentally characterize the in-plane flow behavior of gas diffusion layers (GDL). Radial flow of gas and liquid through the GDL result in the same permeability values. Finally, four types of commercially available GDL are characterized at various levels of compression.

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Wu, R., X. Zhu, Q. Liao, H. Wang, and Y. D. Ding. "Pore Network Modeling of Oxygen Diffusion in Gas Diffusion Layer of Proton Exchange Membrane Fuel Cells." In ASME 2009 Second International Conference on Micro/Nanoscale Heat and Mass Transfer. ASMEDC, 2009. http://dx.doi.org/10.1115/mnhmt2009-18433.

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In the present study, a three dimensional pore network, consisting of spherical pores and cylindrical throats, is developed to simulate the oxygen diffusion and liquid water permeation in gas diffusion layer (GDL) in low-temperature fuel cell. Oxygen transport in the throats is described by Fick’s law and liquid water permeation in the network is simulated using percolation invasion algorithm. The effects of heterogeneity of GDL, connectivity of pores, and liquid water saturation on oxygen effective diffusivity are investigated respectively. The simulation results show that the GDL structure h

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Gan, Mingfei, and Lea-Der Chen. "Analytical Solution for Two-Phase Flow in PEMFC Gas Diffusion Layer." In ASME 2006 4th International Conference on Fuel Cell Science, Engineering and Technology. ASMEDC, 2006. http://dx.doi.org/10.1115/fuelcell2006-97104.

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Thermal and water management is critical to fuel cell performance. It has been shown that gas diffusion layer (GDL) can impose the mass transport limit; for example, it can block the reactant transport to active layer when flooding occurs at high current density conditions. Micro porous layer (MPL) in conjunction with backing layer (BL) has been used as a GDL material and was shown to be effective for water management. To study the transport processes in GDL and MPL modified GDL, an analytical solution is derived current study for calculation of two-phase, multicomponent transport in GDL. Two

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Meng, Hua, and Chao-Yang Wang. "Electron Transport in Gas Diffusion Layer of Polymer Electrolyte Fuel Cells." In ASME 2003 International Mechanical Engineering Congress and Exposition. ASMEDC, 2003. http://dx.doi.org/10.1115/imece2003-55175.

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A three-dimensional, single-phase, isothermal numerical model of polymer electrolyte fuel cell (PEFC) is employed to investigate effects of lateral electron transport in gas diffusion layer (GDL) for the first time. An additional electron transport equation is solved in the catalyst and gas diffusion layers, and in the current collector. It is found that the lateral electronic resistance plays a critical role in determining the current distribution and cell performance. With reduced GDL thickness, the effect of the lateral electronic resistance becomes even stronger, because the cross-sectiona

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Ito, Kohei, Kensuke Ashikaga, Tomohiko Miyazaki, et al. "Estimation of Flooding in PEMFC Gas Diffusion Layer by Differential Pressure Measurement." In ASME 2006 4th International Conference on Fuel Cell Science, Engineering and Technology. ASMEDC, 2006. http://dx.doi.org/10.1115/fuelcell2006-97251.

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The flooding, especially in gas diffusion layer (GDL), is one of the critical issues to put PEMFC to practical use. However, the experimental data of the flooding in GDL is so insufficient that the optimization design to solve the flooding problem in GDL has not established until now. In this study we show a method to estimate the water saturation, namely the water droplet occupation for unit volume in GDL. We fabricated a simple interdigitated cell where the supply gas is enforced to flow under rib. This structure made it possible to capture the water droplet in GDL with the measurement of di

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Wang, Yun, Xuhui Feng, Ralf Thiedmann, Volker Schmidt, and Werner Lehnert. "Micro-Scale Transport in the Diffusion Media of Polymer Electrolyte Fuel Cells." In ASME 2009 Second International Conference on Micro/Nanoscale Heat and Mass Transfer. ASMEDC, 2009. http://dx.doi.org/10.1115/mnhmt2009-18201.

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This paper reports our recent work on the stochastic-model-based reconstruction of the gas diffusion layer (GDL) of PEFCs and direct numerical simulation and presented the pore-level transport within GDLs of polymer electrolyte fuel cell (PEFC). The carbon-paper-based GDL is modeled as a stack of thin sections with each section described by planar 2D random line tessellations which are further dilated to three dimensions. The reconstruction of the GDL structure is based on given GDL data provided by scanning electron microscopy (SEM) images. Based on the stochastically constructed digital GDL,

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Miyamoto, Jun-ichi, Junpei Ooyama, and Yoshiaki Yamamoto. "Thermal Conductivity Measurements of Gas Diffusion Layer Under Controlled Temperature, Humidity and Stress." In ASME 2009 7th International Conference on Fuel Cell Science, Engineering and Technology. ASMEDC, 2009. http://dx.doi.org/10.1115/fuelcell2009-85111.

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In this work, thermal conductivities of gas diffusion layer (GDL) under controlled temperature, humidity and stress are measured. Additionally, we investigated the anisotropic thermal conductivity of GDLs. The experimental results showed that thermal conductivity of in-plane direction was much higher than that of trough-plane direction for all the samples that were measured. This result indicated thermal conductivity of GDLs to be strongly anisotropic since GDL is a highly porous material which contains large amount of air inside the GDL. Moreover, we found that thermal conductivity of GDL in

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Schulz, Volker P., Partha P. Mukherjee, and Heiko Andra¨. "Compression Modeling and Transport Characterization of the PEM Fuel Cell Diffusion Medium." In ASME 2011 9th International Conference on Fuel Cell Science, Engineering and Technology collocated with ASME 2011 5th International Conference on Energy Sustainability. ASMEDC, 2011. http://dx.doi.org/10.1115/fuelcell2011-54298.

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Despite tremendous progress in recent years, a pivotal performance limitation in PEM fuel cells manifests in terms of mass transport loss owing to liquid water transport and resulting flooding. A key contributor to the mass transport loss is the cathode gas diffusion layer (GDL) due to the blockage of available pore space by liquid water thus rendering hindered oxygen transport to the active reaction sites in the electrode. The GDL, typically a non-woven carbon paper or woven carbon cloth, thus plays an important role in the overall water management in PEM fuel cells. The underlying pore-morph

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Kudo, Kazuhiko, Akiyoshi Kuroda, Shougo Takeoka, and Yosuke Shimazu. "Modeling of Flooding Phenomena in Hydrophobic Gas Diffusion Layer of PEFC." In ASME/JSME 2007 Thermal Engineering Heat Transfer Summer Conference collocated with the ASME 2007 InterPACK Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/ht2007-32110.

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The mechanism of liquid water removal, water vapor diffusion and oxygen diffusion in cathode side gas diffusion layer (GDL) of PEFC is studied by modeling the GDL as a hydrophobic flat plate with many straight holes with different diameters. As the results of the consideration using the model, following results are obtained. The spots where liquid water condensation is taken place between GDL-MEA gap are limited to the inlets of holes with larger diameters, and the condensed water is drained to air flow channel only through the larger holes. Other holes with smaller diameters are free of liqui

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Raporty organizacyjne na temat "Couche de diffusion (GDL)"

Monetary Policy Report - January 2023. Banco de la República, 2023. http://dx.doi.org/10.32468/inf-pol-mont-eng.tr1-2023.

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1. Macroeconomic Summary In December, headline inflation (13.1%) and the average of the core inflation measures (10.3%) continued to trend upward, posting higher rates than those estimated by the Central Bank's technical staff and surpassing the market average. Inflation expectations for all terms exceeded the 3.0% target. In that month, every major group in the Consumer Price Index (CPI) registered higher-than-estimated increases, and the diffusion indicators continued to show generalized price hikes. Accumulated exchange rate pressures on prices, indexation to high inflation rates, and sever

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