The oxygen diffusion coefficient in air measured by this method corresponded with data in the literature within 卤6% deviation. The oxygen diffusion coefficients of two kinds of porous media generally used for the GDL were measured by the experimental method for dry and wet samples. The results ...
Mixed ionic and electronic conductors (MIEC) have presented great economical and environmental interests for these last years because of their potential applications for electrode materials in solid oxide fuel cell and for oxygen separation form air such as in catalytic membrane reactors for methane conv...
diffusion coefficientChapman-Etskog methodairargonnitrogenCalculated values of the viscosity, thermal conductivity and electrical conductivity of air and mixtures of air and argon, air and nitrogen, and air and oxygen at high temperatures are presented. In addition, combined ordinary, pressure, and ...
It is, therefore, probable that the cell membranes could be a barrier to oxygen diffusion. Since the diffusion coefficient is inversely proportional to the membrane viscosity, the distribution of the conductance for oxygen diffusion in the barrier can be calculated. Hence the influence of the ...
A solid-state electrochemical cell of yttria-stabilized zirconia was employed to determine the oxygen ion conductivity and thus oxygen ion diffusion in the 80 K phase (2212) BiPbSrCaCuO superconductor via impedance measurements in the temperature range 500 less than or equal to T less than or equ...
Studies on Oxygen Characteristics of YBa2 Cu3 O7-x and Its Applications to Air Separation and Gas Purification Oxygen diffusion and oxygen selective adsorption properties of rare earths material YBa2Cu3O7-x (YBCO) were investigated by thermogravimetric, oxygen stati... D Yang,J Mo,H Lu,......
$ . In both cases, the permeation-limiting regime was determined and the oxygen surface coefficient k s and diffusion coefficient D v were evaluated. The low value of k s was found to be the most critical parameter for the performance of these LSFG membranes. 展开 关键词: Mixed ionic–e...
In the latter case, nitrogen plays certainly the role of an oxidation inhibitor as it works as a barrier to diffusion. In this paper, we also have determined all the coefficient (activation energy and autodiffusion coefficient) to predict the thickness of the oxidized layer and diffused layer....
The exchange is comprised of O2 adsorption, dissociation, and incorporation at the surface, followed by O2− diffusion in the bulk1,2. SOFC cathode materials that perform these operations efficiently are almost all mixed electronic and ionic conducting complex oxides, and typically have the ...
Influence of dissolved hydrocarbons on volumetric oxygen mass transfer coefficient in a novel airlift contactor Hydrocarbon compounds are sparsely soluble in aqueous systems but, nonetheless, their presence can influence significantly mass transfer behavior in gas–l... B Jajuee,A Margaritis,D Karamanev...