Effect of Contact between Electrode and Interconnect on Performance of SOFC Stacks

Abstract

AbstractThis work investigates the effect of contact between electrodes and alloy interconnects on output performance of solid oxide fuel cell (SOFC) stacks. The measured maximum output power density (pmax) of the unit cell increases from 0.07 to 0.1 W cm–2 by increasing the tip area of the interconnect from 40 to 60 cm2. The pmax increases from 0.07 to 0.15 W cm–2 upon the addition of nickel foam and Ag mesh on the anode and cathode side, respectively. An additional (La0.75Sr0.25)0.95MO3–σ cathode current collecting layer is re‐printed on the original cathode current collecting layer, which aims to further improve the performance of the stack and individual cell. The performance of a 3‐cell short stack assembled by the cells with a new cathode current collecting layer is evaluated by measuring the current–voltage curve. The results indicate that the pmax values of the stack and individual cells are enhanced from 0.07 to 0.37 W cm–2 and 0.15 to 0.5 W cm–2 at 850 °C, respectively. The performance of the whole stack and individual cells is greatly improved due to the interconnect embedded in the re‐printed new cathode current collecting layer.