Improvement in electrode performance of three-phase fluidized-bed electrodes for an alkaline fuel cell cathode

An improvement in electrode performance of a three-phase fluidized-bed electrode for an alkaline fuel cell cathode has been carried out in a 51 mm i.d., 300 mm high half-cell at 333 K. Platinum-coated Raney silver particles of 0.6 mm diameter were employed as the working electrode in the three-phase fluidized-bed electrode. A dimpled nickel plate current collector was used to reduce the electrical resistance between the current collector and the electrode particles. A significant improvement in electrode performance was achieved for the platinum-coated Raney silver particle system with the dimpled current collector, where the polarization resulted mainly from diffusion resistance. (C) 1997 International Association for Hydrogen Energy.