Abstract
A new theoretical approach has been established to define transport coefficients of charge and mass transport in porous materials directly from impedance data; thus four transport coefficients could be determined. In case of ammonia adsorption on sulfated zirconia, the diffusion coefficient was figured out to be approximately the mobility diffusion coefficient of ammonium ions: 1.2 x 10-7 cm2/s. The transport of carbon dioxide was examined for samples of zeolite type 5A in different hydration states. By impedance spectroscopy measurements, the diffusion coefficient of water vapor at 373 K is estimated to be about 7 x 10-6 cm2/s. The influence of carbon dioxide adsorption on diffusion coefficients is studied based on two pellet types of zeolite 5A. The difference between polar and non-polar gas adsorption in porous solids is considered as changed characteristic of impedance.
Highlights
A New Approach to Determine Gas Diffusion Coefficients in Porous Solids by Electrochemical impedance spectroscopy (EIS)Chair of Technical Thermodynamics, Faculty of Mechanical Science and Engineering, Technical University of Dresden, Helmholtzstr. 14, Dresden 01069, Germany
Gas transport in porous material plays a significant role in industrial applications, especially in electrocatalysis, batteries, and gas sensor research
Satsuma and coworkers [10] have reported a good response of ammonia sensing on thick film tungstated-zirconia. They indicated from results of impedance spectroscopy method that ammonia plays a significant role in increasing the conductivity of tungstated-zirconia
Summary
Chair of Technical Thermodynamics, Faculty of Mechanical Science and Engineering, Technical University of Dresden, Helmholtzstr. 14, Dresden 01069, Germany. Chair of Technical Thermodynamics, Faculty of Mechanical Science and Engineering, Technical University of Dresden, Helmholtzstr. A new theoretical approach has been established to define transport coefficients of charge and mass transport in porous materials directly from impedance data; four transport coefficients could be determined. The transport of carbon dioxide was examined for samples of zeolite type 5A in different hydration states. The diffusion coefficient of water vapor at 373 K is estimated to be about 7 x 10−6 cm2/s. The influence of carbon dioxide adsorption on diffusion coefficients is studied based on two pellet types of zeolite 5A. The difference between polar and non-polar gas adsorption in porous solids is considered as changed characteristic of impedance
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