Non-monotonic conductivity relaxation of proton-conducting BaCe0.85Y0.15O3−δ upon hydration and dehydration

Partial Conductivities and Chemical Diffusivities of Multi-Ion Transporting BaZrxCe0.85-xY0.15O3-δ(x = 0, 0.2, 0.4 and 0.6)

“…Furthermore, the values ofD iH were always higher than that ofD vH , indicating that the chemical diffusion of H was always faster than that of O during the hydration/dehydration process. Also, the diffusivity values for BCY0 are higher than those previously reported, 66 which is due to the fact that in the present study it is assumed that both surface exchange reaction and bulk diffusion affect the spatial average concentration of charge carriers but in the previous study 66 it was assumed that the surface reaction rate is much faster than bulk diffusion. Figure 13 shows the variation of surface exchange coefficient of H (κ iH ) and O (κ vH ) during pH 2 O change.…”

“…Figure 11 shows typical transient behavior of electrical conductivity of BZCY upon hydration/dehydration in log(pH 2 O/atm) = −2.51 ↔ −2.36 range at 800 • C in air. Yoo et al 30 mentioned that during hydration/dehydration at fixed pO 2 the 27,53,[63][64][65][66] and as can be seen from Figure 11, the overall ECR profile during the hydration/dehydration in BZCY is also non-monotonic with a twofold relaxation behavior. It was noticed that the non-monotonic valley becomes deeper as hole conductivity increases with Ce rich composition or as more p-type oxidizing regime is observed in a fixed composition.…”

Low-temperature fabrication of protonic ceramic fuel cells with BaZr0.8Y0.2O3−δ electrolytes coated by aerosol deposition method

“…Whereas the BZY pellet measured in dry air shows high E a value (~0.66 eV) since the conductivity of BZY is more electronic and the E a of electronic conduction is higher than that of the ionic conduction [41]. The E a values of the BZY films in the two cells may also be underestimated due to inductive errors in estimating the R U of BZY layers as previously discussed (Fig.…”

Incorporation of Bulk Proton Carriers in Cubic Perovskite Manganite Driven by Interplays of Oxygen and Manganese Redox

“…In proton-conducting ceramic electrolytes such as BaZr 1– x – y Ce x Y y O 3 , the proton carriers are incorporated via the association between oxygen vacancies and water molecules, as represented in eq . ,, …”