International Journal of Hydrogen Energy, Vol.43, No.4, 2402-2409, 2018
Electrochemical behavior and performances of Ni-BaZr0.1Ce0.7Y0.1Yb0.1O3-delta cermet anodes for protonic ceramic fuel cell
High performance Ni-BCZYYb cermet anode were prepared at 1300 degrees C using electrolyte powders prepared by combustion and commercial NiO. The cermets are porous (39 vol% of porosity), show a high electronic conductivity (1097 S cm(-1)) and sufficient mechanical properties. The electrochemical behavior of the Ni-BCZYYb/BZCYYb-ZnO/Ni-BCZYYb symmetrical cell elaborated by co-pressing and co-sintering was investigated using electrochemical impedance spectroscopy. The impedance spectroscopy study show that the electrode reaction involves three steps. The total polarization Area Specific Resistance decreases by about one order of magnitude when increasing the temperature from 450 to 600 degrees C or the H-2 concentration from 5 to 100 vol% to reach 0.049 Omega cm(2) at 600 degrees C under pure hydrogen. (C) 2017 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.