Absolute potential analysis of the mixed potential occurring at the oxide/YSZ electrode at high temperature in NOx-containing air

Mixed potential phenomena occurring at the oxide/YSZ electrode in the presence of NOx-containing air is explained in terms of the absolute potential model, which demonstrates how maintaining a non-equilibrium state with gas phase, through catalytic inactiveness of the electrode, is important to obtain a noticeable EMF response to NO2 and NO. The directions of the EMF response of oxide electrodes to NO and NO2 gas are coincident with the prediction from the absolute potential analysis. Simulated results of anodic and cathodic currents for Pt electrode clearly show the insensitivity to NO2 and NO as suggested in the analysis.