Park, S. Intech, Rijeka It may be noted that with increasing titanium content, the laser power required is decreased in order to achieve a continuous sintered layer. The cell was equipped with a DLR home-made segmented board to monitor the current density distribution. The experimental setup allows the through-plane measurement under ambient pressure. Electrochemical degradation is due to the oxidation of carbon to carbon dioxide, and is illustrated in Equation 1 :. The thermal stability measurement of the chemically modified GDLs showed rapid decrease of sample mass during heating. To circumvent that, a novel additive manufacturing approach incorporating selective laser sintering was used to fabricate a non-carbon-based GDL directly from a 3D printing technique additive manufacturing. The color scale corresponds to integrated C—F intensities. For detailed investigation of surface structure and morphology, the samples were scanned with a Jeol JCM electron microscope.
Gas diffusion layer (GDLs) are essential components of PEMFCs and optimization of their gas permeability, transport properties on water management and gas supply. For a typical fuel cell application, where the viscosity ratio, defined as.
Gas Diffusion Layer Characteristics and Modeling
Linear empirical relationships for permeability coefficient vs. limiting current were found at all three conditions.
Characterization of the gas diffusion layers by. The gas diffusion layer provides five key functions for a PEM fuel cell: mechanical that for a given stoichiometric ratio, changes to GDL permeabil- ity have.
El Hannach, M. The degree of hydrophobicity is determined by the simple concept proposed by Zamora et al. It should be noted that the water management is influenced by many effects, e.
Studies on PEM fuel cells using various alcohols for low power applications. Gardner, C. In recent studies the non-homogeneous distribution of PTFE was investigated [ 111415 ]. Figure 4.
for flow, the permeability is not necessarily proportional to the porosity, but where J is the diffusive flux, D is the diffusion coefficient for each. Abstract: Gas diffusion layers (GDLs) play a significant role in the efficient operation of The gas permeability of a GDL was measured by Tamayol et al.
Video: Gas diffusion layer permeability coefficient The microstructure of Gas Diffusion Layer of PEM fuel halidirek.com
Figure 3c is in line with the variation coefficient of smax in Table 2.
The width of the channel and the land was 1. Published online Jul Seidenberger K.
Find articles by Sarat Singamneni. Fuel Cells.
Characterization of Gas Diffusion Layers for PEMFC
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|Solutions used for chemical modification may influence the carbon fibers and the diffusion layer becomes less stable during the temperature increase. Hung Y. For detailed analysis of the physical properties of the patterned GDLs, further GDLs were modified by sulfuric acid and hydrogen peroxide for comparison.
The thermal stability measurement of the chemically modified GDLs showed rapid decrease of sample mass during heating. Qi, Z. Electrical and thermal conductivity of polymers filled with metal powders.