Effect of Electrode Morphology on the Electrochemical Performance of Pt/YSZ Electrodes

摘要

This study is focused on the effect of catalytic electrode morphology on the electrochemicalperformance of one of the most prominent solid state electrode systems, Pt(O2)/YSZ system. Twotypes of sintered Pt(O2)/YSZ electrodes (metal Pt electrode and metal-ceramic electrode) prepared byscreen printing of different Pt pastes are investigated in this work. The morphology of the catalyticelectrodes is characterized by scanning electron microscopy (SEM) and their electrochemicalbehaviors are investigated by CV techniques and chronoamperometry. Cyclic voltammetry on thePt/YSZ catalytic electrodes evidences the characteristics of the oxygen charge exchange reaction. Thecorresponding redox reactions occur nearby the tripe phase boundary (tpb) and manifest themselves byone of more cathodic peaks and an anodic wave in the voltammograms. Series investigationsdemonstrate that the metal-ceramic electrodes show the high electrochemical activity of oxygen chargeexchange reactions and can expect significant usage in the field of oxygen sensors and solid oxide fuelcells.