International Journal of Hydrogen Energy, Vol.43, No.2, 960-967, 2018
Fabrication of a quasi-symmetrical solid oxide fuel cell using a modified tape casting/screenprinting/infiltrating combined technique
To develop the symmetrical electrode materials for solid oxide fuel cells (SOFCs) and to explore the facile cell fabrication technique are both meaningful and of great significance. Here a bi-functional hybrid material LaNi0.82Fe0.18O3 (LNF)/NiO was synthesized by a one pot citrate method and further used as the quasi -symmetrical electrode catalysts for solid oxide fuel cells (SOFCs). LNF and Ni (reduced NiO) functioned as the cathode/anode catalysts. The La0.9Sr0.1Ga0.8Mg0.2O3 (LSGM) based asymmetrical tri-layered substrates were fabricated by a screen -printing assisted co -firing technique. The polarization resistances (Rp) of the infiltrated anode at 700, 650, 600 and 550 degrees C were only 0.08, 0.12, 0.18 and 0.3 Omega cm(2), respectively. Comparably, the Rp of the infiltrated cathode were much larger, e.g., 0.18, 0.35, 0.875 and 2.55 Omega cm(2) at 700, 650, 600 and 550 degrees C, respectively. Encouragingly, these cathode Rp values were largely reduced when discharge due to an activation process. The LNF and NiO reversibly formed and decomposed during the oxidation and reduction processes, suggesting that the LNF/NiO hybrid is a potential quasi -symmetrical SOFC electrode material. When using H-2 as fuel and air as oxidant, the maximum power densities of the single cell at 650, 600 and 550 degrees C were as high as 928, 580 and 329 mW cm(-2), respectively. (C) 2017 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.