Accession Number : AD0293849

Title :   A STUDY OF THE CONTRIBUTION OF SURFACE FLOW TO MASS TRANSPORT IN POROUS GAS DIFFUSION ELECTRODES

Corporate Author : FLORIDA UNIV GAINESVILLE ENGINEERING AND INDUSTRIAL EXPERIMENT STATION

Personal Author(s) : WENGROW,HENRY R.

Report Date : 15 DEC 1962

Pagination or Media Count : 1

Abstract : Surface mobility contributes very little to the total flow through pores except where pore radius is very small (R < 100 microns). In this range of pore radii current densities are on the order of 0.1 amp/sq. cm. for a pore of 1 cm length. If pore length is decreased, current density will be increased. Coating of the electrode surface with wet-proofing agents does not appear to affect substantially the flow of gas molecules by surface migration. Therefore, surface migration can be neglected in computing mass transfer in normal porous electrodes for these usually contain pores having radii 1000 microns or larger. (Author)

Descriptors :   *DIFFUSION, *ELECTRODES, *FUEL CELLS, *GASES, *TRANSPORT PROPERTIES, ADSORPTION, COATINGS, ELECTROCHEMISTRY, ETHYLENES, FILMS, FLUORIDES, GRAPHITE, HYDROCARBONS, PLATINUM, POLYMERS, POROUS MATERIALS, PRESSURE, THEORY

Distribution Statement : APPROVED FOR PUBLIC RELEASE