Stability of Channeled Ni–YSZ Cermets Produced from Self-Assembled NiO–YSZ Directionally Solidified Eutectics
Channeled yttria-stabilized cubic phase of the zirconia (Ni–YSZ) cermets are produced by reduction of laser-assisted directionally solidified NiO–YSZ lamellar eutectics. The material is formed by ∼400 nm wide alternating lamellae of 40% porous Ni and YSZ, which serve as parallel channels for gas flow and electronic transport and for oxygen ion diffusion. The low-energy interfaces formed between the metallic Ni particles and the YSZ prevent particle coarsening and impart long-term stability to the anode at operating temperatures. The electrical conductivity and the pore size distribution present no degradation after 300 h at 900°C under a H2/N2 atmosphere. This stability is indicative of an improvement in comparison with conventional Ni–YSZ anodes for solid oxide fuel cells.
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Document Type: Research Article
Affiliations: Instituto de Ciencia de Materiales de Aragón, CSIC–U Zaragoza, E-50018 Zaragoza, Spain
Publication date: November 1, 2005