TY - JOUR
AU - Flengas, S. N.
AB - The nature and characteristics of the overpotential in cells of the type  were determined from 700° to 1100°C over a wide range of oxygen pressures. Porous Pt black electrodes were deposited on impervious  tubes. Almost pure resistance polarization is observed when  or  mixtures are present at the anode. However, for  mixtures dilute in  at the cathode, diffusion overpotential readily appears and limiting currents are eventually reached. Limiting currents, proportional to , are controlled by the diffusion of gaseous oxygen in the pores of the Pt electrode. Based on the present results and adsorption data, a mechanism is proposed for the cathode reaction. For  mixtures, transition overpotential associated with the reaction  is observed. The transition factor is about 0.5 and exchange current densities are in the vicinity of 1 mA/cm2. Equations relating exchange current density to , , and the amount of  adsorbed on the electrolyte are derived and compared with the experimental results. It is concluded that either gaseous or adsorbed  and gaseous  are directly involved in the electrochemical step of the reaction.
TI - Overpotential Behavior of Stabilized Zirconia Solid Electrolyte Fuel Cells
JF - Journal of the Electrochemical Society
DO - 10.1149/1.2407862
DA - 1971-12-01
UR - https://www.deepdyve.com/lp/iop-publishing/overpotential-behavior-of-stabilized-zirconia-solid-electrolyte-fuel-e3itHmyDbB
SP - 1890
EP - 1900
VL - 118
IS - 12
DP - DeepDyve
ER -