Fabrication and characterization of a tubular ceramic fuel cell based on BaZr0.1Ce0.7Y0.1Yb0.1O3-δ proton conducting electrolyte

A proton conducting anode supported tubular fuel cell is fabricated in this research using the highly proton conductive BaZr0.1Ce0.7Y0.1Yb0.1O3-delta, (BZCYYb) electrolyte. The cell is in a Ni-BZCYYb/BZCYYb/LSCF-BZCYYb configuration consisting of a support, electrolyte and cathode with thicknesses of 680 mu m, 25 mu m and 90 mu m, respectively. The cell delivers maximum power densities of 331, 362 and 416 mW/cm(2) at 600, 650 and 700 degrees C, respectively. AC impedance spectroscopy results show values of 0.94 Omega.cm(2), 0.73 Omega.cm(2), and 0.60 Omega.cm(2) for total resistance at the corresponding temperatures while the major resistance contributor is the ohmic resistance. The Ni-BZCYYb anode microstructure shows detachment of Ni and the BZCYYb in most regions as well as pores inside the Ni grains. Despite the low anode porosity (25%), the cell gives a very low concentration polarization value (0.05 Omega.cm(2)) indicating that the fuel gas could readily diffuse into the microstructure. This might be attributed to water forming on the cathode side, which masks the necessity of having a high porosity anode. The cell fails when tested under CO:H-2 of 1:1 at 700 degrees C due to significant carbon (graphite) formation indicating that proton conductors based on barium cerates are not appropriate choices for application under hydrocarbon fuels. (C) 2016 Elsevier B.V. All rights reserved.