“…At the Pt/YSZ interface, PtO x formation is an electrochemical process following a parabolic growth law, while the presence of PtO x at the Pt/gas interface is related to the diffusion of PtO x formed at the triple phase boundary (TPB) towards the Pt/gas interface [12]. However, the stability of PtO x is thermodynamically not favored at 400 • C under HV conditions restraining the appearance of EP [11]. In order to investigate the influence of PtO x on EP, decreasing the operation temperature to stabilize PtO x seems an alternate way according to thermodynamic data [13].…”