... decompose at temperature of 320 °C while chitosan membranes at 230 °C. Methanol permeability through chitosan membrane of higher dda was more than with one lower dda, however, the permeability through chitosan was three times lower when compares to Nafion membranes under the same temperature and pressure...

....% alumina improves the problem of gas leakage through electrolyte layer, whereas provides no solution to the problem of electrodes short-circuiting. Infiltration of deposited electrolyte layer with a thin aqueous solution of nitrate precursors of 8YSZ for one time is a solution to high gas permeability...

..., morphology, methanol permeability, proton conductivity, and ion exchange capacity. The best H 2 /air cell performance was achieved at 80 °C with a maximum power density of 16.9 mW/cm 2 at a voltage of about 0.35 V. Polyurethane based ionomeric membranes have proved to be interesting candidates for proton...

...Terry B. Caston; Kanthi L. Bhamidipati; Haley Carney; Tequila A. L. Harris The goal of this study is to design a gas diffusion layer (GDL) for a polymer electrolyte membrane (PEM) fuel cell with a graduated permeability and thereby graduating the resistance to flow throughout the GDL. It has been...

...M. S. Ismail; T. Damjanovic; K. Hughes; D. B. Ingham; L. Ma; M. Pourkashanian; M. Rosli The through-plane permeability has been experimentally measured for untreated and polytetrafluoroethylene-treated (PTFE-treated) gas diffusion layers (GDLs), as used in proton exchange membrane fuel cells...

... permeability of air is 3%. The current study elucidates the potential to enable improvements in GDL design, material composition, and cell design to be realized through a greater understanding of the nano- and microscale transport processes occurring within the polymer electrolyte fuel cell. Benziger...

...Eric A. Müller; Florian Kolb; Lino Guzzella; Anna G. Stefanopoulou; Denise A. McKay The permeability or crossover characteristics of a typical perfluorosulfonic acid base type membrane are used for the temporal and spatial estimations of nitrogen concentration along the anode channels of a polymer...

...Zhongying Shi; Xia Wang; Laila Guessous The gas diffusion layer (GDL) plays an important role in maintaining suitable water management in a proton exchange membrane fuel cell. The properties of the gas diffusion layer, such as its porosity, permeability, wettability, and thickness, are affected...

... become possible without detrimentally affecting the power output to a great extent. In this study the effect of variations of the sintering temperature of the cathode on (1) the microstructure, (2) the gas diffusivity and permeability in the cathode, and (3) electrochemical performance of FZJ-type anode...

... resistance and gas permeability of the carbon paper. Practical fuel cells of 50 cm 2 reaction area with different gasket thicknesses and compressed pressures are tested for performance. The results of ohmic resistance and permeability of compressed carbon paper indicate strong relevance to cell performance...

..., 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...

... and 318 kJ ∕ mol , respectively. 24 03 2004 30 07 2004 oxygen composite materials membranes zirconium compounds yttrium compounds lanthanum compounds strontium compounds manganese compounds ceramics secondary ion mass spectra mixed conductivity permeability isotope exchanges...