...T. Ajeesh Mohan; M. Jithin; Malay K. Das The porosity of the cathode in a lithium–oxygen battery is a crucial parameter that influences oxygen transport and active surface area availability. This study explores various cathode models with different initial porosity distributions and analyzes...

...Brajesh Kumar Kanchan; Pitambar R. Randive; Sukumar Pati The present study numerically investigates the implication of different porosity configurations, viz., uniform, algebraic, trigonometric, logarithmic, and stepwise constant porosities at the negative electrode on performance characteristics...

... by the least square method. Based on the commercial code abaqus , a program is developed to predict the contact resistivity. In addition, the changes of contact pressure, contact area, and porosity of GDL are studied. The experimental result shows that the contact resistivity nonlinearly decreases...

...% and 12% for low and high current density conditions respectively. It is also shown that cathode saturation dependence on the interfacial liquid coverage fraction α is reduced with an increase in porosity ɛ. As ɛ increases from 0.3 to 0.5, the cathode saturation difference is reduced by 22...

..., electrolyte thickness, porosities, and pore sizes. The analysis is carried out for a planar SOFC with YSZ electrolyte, LSM cathode, and Ni-YSZ anode, with thicknesses 20, 50, and 500 μm respectively, and with co-flow geometry. The predicted performance is validated with measured data found in the literature...

... of the phase contrast. Porosity, however, has been found to not be a significant factor for active TPB formation in the range studied, but does not obviate the need for modeling the gas phase. In addition, the current work has investigated the inconsistencies in experimental literature results concerning...

... numerical models were developed to illustrate the multiphase flow and transport in the fuel cell. The accuracy of these models depends on the accurate measurement of the GDL properties such as wettability, surface energy, and porosity. Most of the studies conducted for measuring the wettability of the GDL...

... variables (time, temperature, vapor content, cycling, porosity, and current flow), while other aspects are constant (sample composition and particle size and shape). 18 02 2010 24 02 2010 24 08 2010 24 08 2010 oxidation porosity porous materials solid oxide fuel cells...

... Laboratory (PNNL). The activation overpotential was investigated through the exchange current density term, which is dependent on the cathode activation energy, the cathode porosity, and the pore size and grain size at the cathode triple phase boundary. The cathode pore size, grain size, and porosity were...

... proportional to the ratio of the density of hydrogen to water. Sensitivity derivatives of the cost function are obtained with respect to the design variable, Psi, the ratio of porosity to tortuosity in the mean transport pore model with three methods: finite-difference, direct differentiation, and the adjoint...

...Yves Deyrail; Frej Mighri; Serge Kaliaguine The aim of this work is to improve the porosity of gas diffusion layers (GDLs) for proton exchange membrane fuel cell electrodes. These GDLs are made by twin-screw extrusion process from conductive formulations composed of polyamide11 (PA11)/polystyrene...

... and a film of controlled porosity was generated. The morphology of the GDL porous structure was then analyzed by scanning electron microscopy. GDL porosity characterization was done by both Brunauer–Emmett–Teller (BET) and mercury-intrusion porosimeter. The effects of PS concentration and extraction time...

... in size due to the micropores developed by coated materials, and the overall porosity was higher than 75% under optimal synthesis conditions, which is also promising for MCFC applications. The synthesis of LCO ‐ Ni powder was performed in 1.5 L of LiOH ∙ H 2 O aqueous...

..., microstructures, porosities and overall thickness, and has been used successfully to produce a thin 40mol% La 2 O 3 -doped Ce O 2 (LDC40) interlayer ( ∼ 5 μ m ) and a high-porosity Ni + LDC 40 anode layer, respectively. In this work we will present the deposition of a variety of electrolyte and electrode layers...

..., are simulated using the finite volume method. The gas flow in the porous electrodes is governed by the isotropic linear resistance model with constant porosity and permeability. The diffusions of reactant species in the porous electrodes are described by the Stefan-Maxwell relation. Effective diffusivities...

...Gang Ju; Kenneth Reifsnider; Xinyu Huang; Yanhai Du Time dependent properties and performance of tubular solid oxide fuel cells were studied numerically and experimentally. The numerical model incorporated local characteristics such as porosity, tortuosity, grain size, and conductivity and was used...