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Title: Thermal expansion of nickel-zirconia anodes in solid oxide fuel cells during fabrication and operation

Abstract

The thermal expansion of NiO-8 mol % Y{sub 2}O{sub 3}-stabilized ZrO{sub 2} (YSZ) composites and Ni-YSZ cermets in air and hydrogen have been investigated in the temperature range from 50 to 1,000 C. The average linear thermal expansion coefficient (TEC) of NiO-YSZ composites in air increased with NiO content over the entire composition range. While NiO in the composites was changed to Ni in the H{sub 2} stream, their expansions were governed by the reduction of NiO. For reduced, Ni-YSZ cermets, the TEC increases significantly with Ni content in the composition range > 60 vol% Ni. The TEC increased gradually during repeated thermal cycles between room temperature and 1,000 C. When cermets were measured in air, the Ni particles were fully oxidized to NiO above 900 C, and many cracks appeared in the samples.

Authors:
; ;  [1];  [2];  [3]
  1. Central Research Inst. of Electric Power Industry, Yokosuka, Kanagawa (Japan)
  2. Chiba Univ., Chiba (Japan). Dept. of Science Education
  3. Yokohama National Univ., Kanagawa (Japan). Inst. of Environmental Science and Technology
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
624309
Resource Type:
Journal Article
Journal Name:
Journal of the Electrochemical Society
Additional Journal Information:
Journal Volume: 145; Journal Issue: 4; Other Information: PBD: Apr 1998
Country of Publication:
United States
Language:
English
Subject:
30 DIRECT ENERGY CONVERSION; 36 MATERIALS SCIENCE; SOLID ELECTROLYTE FUEL CELLS; THERMAL EXPANSION; NICKEL OXIDES; ZIRCONIUM OXIDES; NICKEL; ANODES; CERMETS; FABRICATION; OPERATION

Citation Formats

Mori, Masashi, Yamamoto, Tohru, Itoh, Hibiki, Inaba, Hideaki, and Tagawa, Hiroaki. Thermal expansion of nickel-zirconia anodes in solid oxide fuel cells during fabrication and operation. United States: N. p., 1998. Web. doi:10.1149/1.1838468.
Mori, Masashi, Yamamoto, Tohru, Itoh, Hibiki, Inaba, Hideaki, & Tagawa, Hiroaki. Thermal expansion of nickel-zirconia anodes in solid oxide fuel cells during fabrication and operation. United States. doi:10.1149/1.1838468.
Mori, Masashi, Yamamoto, Tohru, Itoh, Hibiki, Inaba, Hideaki, and Tagawa, Hiroaki. Wed . "Thermal expansion of nickel-zirconia anodes in solid oxide fuel cells during fabrication and operation". United States. doi:10.1149/1.1838468.
@article{osti_624309,
title = {Thermal expansion of nickel-zirconia anodes in solid oxide fuel cells during fabrication and operation},
author = {Mori, Masashi and Yamamoto, Tohru and Itoh, Hibiki and Inaba, Hideaki and Tagawa, Hiroaki},
abstractNote = {The thermal expansion of NiO-8 mol % Y{sub 2}O{sub 3}-stabilized ZrO{sub 2} (YSZ) composites and Ni-YSZ cermets in air and hydrogen have been investigated in the temperature range from 50 to 1,000 C. The average linear thermal expansion coefficient (TEC) of NiO-YSZ composites in air increased with NiO content over the entire composition range. While NiO in the composites was changed to Ni in the H{sub 2} stream, their expansions were governed by the reduction of NiO. For reduced, Ni-YSZ cermets, the TEC increases significantly with Ni content in the composition range > 60 vol% Ni. The TEC increased gradually during repeated thermal cycles between room temperature and 1,000 C. When cermets were measured in air, the Ni particles were fully oxidized to NiO above 900 C, and many cracks appeared in the samples.},
doi = {10.1149/1.1838468},
journal = {Journal of the Electrochemical Society},
number = 4,
volume = 145,
place = {United States},
year = {1998},
month = {4}
}