The role of platinum oxide in the electrode system Pt(O2)/yttria-stabilized zirconia

The existence and role of platinum oxide in the solid state electrode system Pt(O2)/yttria-stabilized zirconia is discussed. Covering and porous model-type Pt film electrodes on YSZ single crystals are investigated by cyclic voltammetry, electrochemical impedance spectroscopy, and in situ scanning photoelectron microscopy. The formation of Pt oxide and its amount strongly depend on the experimental conditions, such as temperature, oxygen partial pressure, and oxygen flux towards the electrode during anodic polarization. Electrode activation and deactivation processes can be explained by formation and decomposition of Pt oxide, which is reducing or inhibiting the oxygen exchange rate.

► First time comprehensive treatise of the Pt-O-interaction in the electrode system Pt/YSZ.
► Detailed view on interface reactions of well defined interfaces between Pt/YSZ.
► Highly porous thin film model electrodes for studying non stationary effects.
► In situ monitoring of the chemical state of Pt at the TPB during polarization by SPEM.