Evaluation of Ni and Ti-Doped Y2O3 Stabilized ZrO2 Cermet as an Anode in High Temperature Solid Oxide Fuel Cells
SCIE
SCOPUS
- Title
- Evaluation of Ni and Ti-Doped Y2O3 Stabilized ZrO2 Cermet as an Anode in High Temperature Solid Oxide Fuel Cells
- Authors
- Mori, M; Hiei, Y; Itoh, H; Tompsett, GA; Sammes, NM
- Date Issued
- 2003-05
- Publisher
- Elsevier
- Abstract
- The compatibility of nickel and Ti-doped 8 mol% Y2O3 stabilized ZrO2 (Ni-Ti-YSZ) cermets has been discussed for use as an anode in high-temperature solid oxide fuel cells (SOFC). The solubility limit of TiO2 in the YSZ fluorite was estimated to be at least 10 mol%. With increasing Ti content in the Ti-YSZ samples, the average linear thermal expansion coefficient was found to decrease when measured in an H-2 atmosphere. In an H-2 atmosphere, the oxygen vacancy concentration was observed to increase with increasing Ti content and temperature, and its value in the 8 mol% Ti-doped YSZ (8Ti-YSZ) sample was 0.0056 at 1000degreesC. Although electronic conduction appeared in the Ti-YSZ samples at temperatures greater than similar to600degreesC in the H-2 atmosphere, their electrical conductivities had a tendency to decrease with increasing Ti content. The mechanical strength of the Ni-Ti-YSZ cermets at room temperature were found to increase with increasing Ti content; Anodic polarization of the 40 vol.% Ni-8Ti-YSZ cermet at 1000degreesC was 60 mV at 300 mA cm(-2) in the H-2 atmosphere after firing at 1400degreesC for 10 h. (C) 2003 Elsevier Science B.V. All rights reserved.
- Keywords
- YSZ; cermet; ZrO2; RAMAN SPECTRAL CHARACTERIZATION; CONDUCTIVITY MEASUREMENTS; ELECTRICAL-PROPERTIES; REDUCING ATMOSPHERES; ZIRCONIA-TITANIA; YSZ CERMET; MICROSTRUCTURE; ZRO2-TIO2; EXPANSION; CERAMICS
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/15306
- DOI
- 10.1016/S0167-2738(03)00144-9
- ISSN
- 0167-2738
- Article Type
- Article
- Citation
- SOLID STATE IONICS, vol. 160, no. 1-2, page. 1 - 14, 2003-05
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