Diffusion‐Controlled Polarization of Pt, Ag, and Au Electrodes with Doped Ceria Electrolyte

摘要: The nature of electrode polarization, previously investigated for Pt paste electrodes, is now studied foil, Ag and Au paste, foil electrodes. current interruption method with a reference employed in the temperature range 500°–800°C under gas mixtures. Electrode structures are also examined by optical electron microscopy. principal experimental feature that Butler‐Volmer equation obeyed cathodic anodic transfer coefficients , respectively, an effective exchange which varies as power . Also, transient decay curves much slower than pure charge mechanism. These features can be interpreted terms model takes place two‐phase region between electrolyte, but where rate controlled interfacial diffusion oxygen atoms along electrode, except when particles extremely small. For extreme cases limitation, adatom concentration over most becomes so low electrolyte reduction place. resulting appreciable electronic contribution treated Wagner polarization‐cell theory.