An efficient ceramic-based anode for solid oxide fuel cells

Autores: Fu, Q.X.|Tietz, F.|Sebold, D.|Tao, S.W.|Irvine, J.T.S.
Fuente: Journal of power sources
171 (2), 663-669
2007

A new ceramic-based multi-component material, containing one electronic conductor (Y-substituted SrTiO3, SYT), one ionic conductor (YSZ) and a small amount (similar to 5 vol.%) of Ni catalyst, was investigated as an alternative anode material for solid oxide fuel cells (SOFCs). The ceramic framework SYT/YSZ shows good dimensional stability upon redox cycling and has an electrical conductivity of similar to 10 S cm(-1) under typical anode conditions. Owing to the substantial electrocatalytic activity of the fine and well-dispersed Ni particles on the surface of the ceramic framework, the electrode polarization resistance of 5 vol.% Ni-impregnated SYT/YSZ anode reached 0.21 Omega cm² at 800º C in wet Ar/5%H-2. Based on these results, a redox-stable anode-supported planar SOFC is expected using this anode material, thus offering great advantages over the current generation of Ni/YSZ-based SOFCs.