H[sub 2]-H[sub 2]O-Ni-YSZ Electrode Performance

The electrochemical properties of the interface between Ni and yttria-stabilized zirconia (YSZ) in the electrode have been investigated in order to obtain knowledge on the effect of segregation of impurities to the electrode-electrolyte interface on performance. Even for a relatively pure nickel electrode, a film of impurities was found at the contact between Ni and YSZ and on the surface of YSZ. Impurity ridges were also found at the three-phase boundary. Impurities in these locations all have the potential of impeding processes and reactions at the electrode-electrolyte interface. The pure electrodes showed a lower resistance compared to most electrodes discussed in the literature. © 2004 The Electrochemical Society. All rights reserved.