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Title: New cathode materials for solid oxide fuel cells: Ruthenium pyrochlores and perovskites

Abstract

The ruthenium pyrochlores, A{sub 2}Ru{sub 2}O{sub 7{minus}{delta}} (A = Pb, Bi), and ruthenium perovskites, ARuO{sub 3} (A = Ca, Sr) were characterized as new electrode materials for solid oxide fuel cells. The electrical conductivity, cathodic polarization, thermal expansion, and reactivity with yttria-stabilized zirconia were examined. The pyrochlores showed low cathodic overpotential even at 800 C, metallic behavior with high electrical conductivity, and no reaction with yttria-stabilized zirconia at 900 C. The thermal expansion coefficient of the bismuth pyrochlore was comparable to yttria-stabilized (8 mol % Y{sub 2}O{sub 3} content) zirconia. The pyrochlores are very attractive for application as cathode materials in a solid oxide fuel cell with low operating temperature.

Authors:
; ; ; ;
Publication Date:
Research Org.:
Kobe Univ., Hyogo (JP)
OSTI Identifier:
20080570
Resource Type:
Journal Article
Journal Name:
Journal of the Electrochemical Society
Additional Journal Information:
Journal Volume: 147; Journal Issue: 5; Other Information: PBD: May 2000; Journal ID: ISSN 0013-4651
Country of Publication:
United States
Language:
English
Subject:
30 DIRECT ENERGY CONVERSION; 36 MATERIALS SCIENCE; SOLID OXIDE FUEL CELLS; CATHODES; RUTHENIUM OXIDES; LEAD OXIDES; BISMUTH OXIDES; CALCIUM OXIDES; STRONTIUM OXIDES; ELECTRIC CONDUCTIVITY; THERMAL EXPANSION; OVERVOLTAGE

Citation Formats

Takeda, Takashi, Kanno, Ryoji, Kawamoto, Yoji, Takeda, Yasuo, and Yamamoto, Osamu. New cathode materials for solid oxide fuel cells: Ruthenium pyrochlores and perovskites. United States: N. p., 2000. Web. doi:10.1149/1.1393425.
Takeda, Takashi, Kanno, Ryoji, Kawamoto, Yoji, Takeda, Yasuo, & Yamamoto, Osamu. New cathode materials for solid oxide fuel cells: Ruthenium pyrochlores and perovskites. United States. doi:10.1149/1.1393425.
Takeda, Takashi, Kanno, Ryoji, Kawamoto, Yoji, Takeda, Yasuo, and Yamamoto, Osamu. Mon . "New cathode materials for solid oxide fuel cells: Ruthenium pyrochlores and perovskites". United States. doi:10.1149/1.1393425.
@article{osti_20080570,
title = {New cathode materials for solid oxide fuel cells: Ruthenium pyrochlores and perovskites},
author = {Takeda, Takashi and Kanno, Ryoji and Kawamoto, Yoji and Takeda, Yasuo and Yamamoto, Osamu},
abstractNote = {The ruthenium pyrochlores, A{sub 2}Ru{sub 2}O{sub 7{minus}{delta}} (A = Pb, Bi), and ruthenium perovskites, ARuO{sub 3} (A = Ca, Sr) were characterized as new electrode materials for solid oxide fuel cells. The electrical conductivity, cathodic polarization, thermal expansion, and reactivity with yttria-stabilized zirconia were examined. The pyrochlores showed low cathodic overpotential even at 800 C, metallic behavior with high electrical conductivity, and no reaction with yttria-stabilized zirconia at 900 C. The thermal expansion coefficient of the bismuth pyrochlore was comparable to yttria-stabilized (8 mol % Y{sub 2}O{sub 3} content) zirconia. The pyrochlores are very attractive for application as cathode materials in a solid oxide fuel cell with low operating temperature.},
doi = {10.1149/1.1393425},
journal = {Journal of the Electrochemical Society},
issn = {0013-4651},
number = 5,
volume = 147,
place = {United States},
year = {2000},
month = {5}
}