THE EFFECT OF ELECTROLYTES IN THE NICKEL CERMET ON THE ANODIC OVERPOTENTIAL OF SOFC

摘要

Decreasing the anodic overpotential originating from the oxidation reaction of hydrogen or hydrocarbon under the power generation condition is important for utilizing the SOFC system. Recently, it was found that the ionic conductivity of the electrolyte component in the anode significantly affects the polarization of the anode. However, the role of the electrolyte in the cermet anode has not been clarified yet. We believe that the oxygen activity on the three-phase-boundary is the key for the oxidation reaction. We conducted X-ray photoelectron spectroscopy (XPS) measurements and temperature-programmed reduction (TPR) measurements using hydrogen to investigate the differences between the cermet anodes. Also, we measured the current dependence of the anodic overpotential by using these Ni-cermet electrodes for studying the anodic overpotential for the SOFC system.