Contribution of the internal active three-phase zone of Ni-zirconia cermet anodes on the electrode performance of SOFCs

Journal Article · Thu Apr 01 04:00:00 EST 1999 · Journal of the Electrochemical Society

DOI:https://doi.org/10.1149/1.1391760· OSTI ID:345314

Nakagawa, Nobuyoshi; Nakajima, Katsunori; Sato, Makiko; Kato, Kunio ^[1]

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1. Gunma Univ., Kiryu, Gunma (Japan). Dept. of Biological and Chemical Engineering

An extension of the effective reaction zone of the Ni-zirconia cermet anode in a solid oxide fuel cell was investigated. The reaction zone, the active three-phase zone (ATZ), of the cermet electrode consists of the zone that is formed on the flat interface between the solid electrolyte and the cermet layer, ATZ{sub 2D}, and another that extends three-dimensionally into the cermet layer, ATZ{sub 3D}, from the cermet/electrolyte interface. Anode performances of four types of cermet electrodes with zirconia powders of different ionic conductivities, but with a very similar microstructure, were compared, and the magnitude ratio of ATZ{sub 3D} and ATZ{sub 2D} was evaluated from the relationships between the performance and the ionic conductivity of zirconia in the cermet. For the anode of Ni-YSZ (yttria-stabilized zirconia, 8 mol % Y{sub 2}O{sub 3}) cermet on partially stabilized zirconia (3 mol % Y{sub 2}O{sub 3}) electrolyte, it was found that the contribution of ATZ{sub 3D} was almost 2.5 times larger than that of ATZ{sub 2D} at 1273 K, H{sub 2}-H{sub 2}O 2.4%.

• OSTI ID: 345314
• Journal Information: Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Journal Issue: 4 Vol. 146; ISSN 0013-4651; ISSN JESOAN
• Country of Publication: United States
• Language: English

Related Subjects

30 DIRECT ENERGY CONVERSION
36 MATERIALS SCIENCE
ANODES
CERMETS
IONIC CONDUCTIVITY
MICROSTRUCTURE
NICKEL ALLOYS
PERFORMANCE
SOLID ELECTROLYTE FUEL CELLS
YTTRIUM OXIDES
ZIRCONIUM ALLOYS