The properties of the LiF-BaF2-CaH2-Al2O3 and NaF-BaF2-CaH2-Al2O3 systems were investigated by means of fuel-cell measurements. Excellent proton conduction was detected in both electrolytes. The proton conductivity was of the order of 10−2 to 10−1S/cm at above 600C. Proton conduction was found to dominate the fuel-cell process, although there was some effect of the hydride ions; which could trap proton transport and lower the fuel-cell voltage. It was concluded that such fuel-cell studies clearly revealed the effects and behavior of various mobile ion species.

Characterization of MF-BaF2-CaH2-Al2O3 (M = Li, Na) Hydrofluorides Based upon Fuel Cell Studies. B.Zhu, X.Yang: Electrochemistry Communications, 1999, 1[9], 411-4