The oxidation of hydrogen at the interface of nickel and the perovskit
e proton conductor Sr0.995Ce0.95Y0.05O2.975 has been investigated at 8
00 degrees C and below in atmospheres of N-2/H-2/H2O, using a point co
ntact electrode technique. The polarisation behaviour obtained in the
anodic regime suggested the transport of a species undergoing one elec
tron transfer. Limiting currents were dependent on the partial pressur
e of hydrogen, but not on that of water vapour.