As the GDL (Gas diffusion layer) is most sensitive component in fuel cell, any change its structure causes a porosity, which strongly influences contact between components of cell. Note that state depends on applied clamping pressure, thickness and porosity GDL, geometry rib (bending radius) BPP (Bipolar plates). These can be subject to variations coming from very high compression, so it necess...

The open architecture of cathodes in Li–air batteries implies the need for porosity with adequate pore size distribution and surface energy optimization regard to electrolyte. interaction liquid cathode material, especially wetting properties, which depend on roughness porosity, electrolyte needs be understood properly avoid flooding assure high active areas. In this work, contact angle goniome...

The transport characteristics of water slugs in a bent gas channel of a polymer electrolyte membrane (PEM) fuel cell are numerically studied using the volume of fluid (VOF) method. To investigate the effects of channel cross-sectional shape in a channel flooding situation, the gas channels (GCs) with one rectangular and two trapezoidal cross sections are compared. Parametric studies are also co...

Thermal conductivity of graphite bipolar plates (BPP) decreases with temperature. Thermal Contact resistance (TCR) between BPP and GDLs decreases with compression. GDL-BPP TCR increases with MPL and PTFE, regardless of the PTFE loading. High PTFE loading, MPL, and BPP outof-flatness increase the TCR dramatically. The graphite BPP-GDL TCR is a dominant resistance in a BPP-GDL assembly. a r t i c...

An analytic robust model is developed for estimating GDL thermal conductivity. The model considers PTFE addition to the GDL. Thermal conductivity of MPL is accurately measured in a compression range of 2e14 bar. Effect of thermal conductivity on PTFE, MPL, and compression is considered. Thermal contact resistances between GDL and MPL/iron surface are measured. a r t i c l e i n f o

The two-phase flow in the gas channels of a proton exchange membrane fuel cell (PEMFC) is studied with an ex situ setup using a gas diffusion layer (GDL) as the sidewall of the channels. Air is supplied at the channel inlet manifold and water is supplied continuously and uniformly through the GDL along the length of the channel. This is different from the simultaneous air and water introduction...

The gas diffusion layer (GDL) is an essential element of the electrodes in polymer electrolyte membrane (PEM) fuel cells. The GDL makes electrical contact with the catalyst layers to provide a larger area to carry the electronic current from the catalyst to the bipolar plates reducing the resistance for current flow. The GDL must be porous to permit the flow of reactant gas from the gas flow ch...

Heat transfer through the gas diffusion layer (GDL) is a key process in the design and operation of a PEM fuel cell. The analysis of this process requires determination of the effective thermal conductivity. This transport property differs significantly in the through-plane and in-plane directions due to the anisotropic micro-structure of the GDL. In the present study, a novel test bed that all...

Heat transfer through the gas diffusion layer (GDL) of a PEM fuel cell is a key process in the design and operation a PEM fuel cell. The analysis of this process requires determination of the effective thermal conductivity as well as the thermal contact resistance between the GDL and adjacent surfaces/layers. In the present study, a guarded-hot-plate apparatus has been designed and built to mea...