Assessment of the performance of Ni-yttria-stabilized zirconia anodes in anode-supported Solid Oxide Fuel Cells operating on H_2-CO syngas fuels

摘要

Anode-supported Solid Oxide Fuel Cells (SOFCs) with Ni-yttria-stabilized zirconia (YSZ) anode have been fabricated and studied using H_2-CO syngas fuels. Syngas fuels with different compositions of H_2-CO are supplied and the cell performance is measured at 750 ℃. A high CO content has caused carbon deposition and crack formation in the Ni-YSZ anode after long-term operation, even though it is diluted with H_2O and N_2. However, it was found that a Cu-CeO_2 coating on Ni-YSZ can greatly improve the anode stability in syngas by facilitating the water gas shift reaction. The optimized single cell has run in sygas with a composition of 65%H_2-32%CO-3%H_2O for 1050h without obvious degradation of its performance.