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Title: Effect of mixed-conducting interfacial layers on solid oxide fuel cell anode performance

Abstract

The interfacial resistance of Ni-Y{sub 2}O{sub 3}-stabilized ZrO{sub 2} (Ni-YSZ) anodes on YSZ electrolytes has been reduced by inserting thin interfacial layers of TiO{sub 2}-doped YSZ (YZT) or Y{sub 2}O{sub 3}-doped CeO{sub 2} (YDC). Impedance spectroscopy measurements at temperatures ranging from 600 to 750 C typically showed a high frequency arc (HFA) and a low frequency arc (LFA). The HFA was reduced by the addition of either interlayer, with a larger reduction for YDC. This presumably resulted from enhanced charge transfer due to the mixed conductivity and/or enhanced redox reaction rate of the interfacial layer. The LFA, which was apparently related to mass-transport processes, grew with decreasing YSZ surface roughness and increasing interlayer thickness. The overall interfacial resistance was minimized for layer thicknesses of {approximately} 0.5 {micro}m. The lowest interfacial resistances in 97% H{sub 2} + H{sub 2}O, 0.13 {Omega} cm{sup 2} at 750 C, and 0.29 {Omega}cm{sup 2} at 600 C, were obtained with 0.5 {micro}m thick YDC interfacial layers.

Authors:
;  [1]
  1. Northwestern Univ., Evanston, IL (United States). Dept. of Materials Science and Engineering
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
653263
Resource Type:
Journal Article
Journal Name:
Journal of the Electrochemical Society
Additional Journal Information:
Journal Volume: 145; Journal Issue: 5; Other Information: PBD: May 1998
Country of Publication:
United States
Language:
English
Subject:
30 DIRECT ENERGY CONVERSION; 36 MATERIALS SCIENCE; SOLID ELECTROLYTE FUEL CELLS; ANODES; PERFORMANCE; NICKEL; YTTRIUM OXIDES; ZIRCONIUM OXIDES; INTERFACES; TITANIUM OXIDES; CERIUM OXIDES; ELECTRIC CONDUCTIVITY

Citation Formats

Tsai, T., and Barnett, S.A. Effect of mixed-conducting interfacial layers on solid oxide fuel cell anode performance. United States: N. p., 1998. Web. doi:10.1149/1.1838542.
Tsai, T., & Barnett, S.A. Effect of mixed-conducting interfacial layers on solid oxide fuel cell anode performance. United States. doi:10.1149/1.1838542.
Tsai, T., and Barnett, S.A. Fri . "Effect of mixed-conducting interfacial layers on solid oxide fuel cell anode performance". United States. doi:10.1149/1.1838542.
@article{osti_653263,
title = {Effect of mixed-conducting interfacial layers on solid oxide fuel cell anode performance},
author = {Tsai, T. and Barnett, S.A.},
abstractNote = {The interfacial resistance of Ni-Y{sub 2}O{sub 3}-stabilized ZrO{sub 2} (Ni-YSZ) anodes on YSZ electrolytes has been reduced by inserting thin interfacial layers of TiO{sub 2}-doped YSZ (YZT) or Y{sub 2}O{sub 3}-doped CeO{sub 2} (YDC). Impedance spectroscopy measurements at temperatures ranging from 600 to 750 C typically showed a high frequency arc (HFA) and a low frequency arc (LFA). The HFA was reduced by the addition of either interlayer, with a larger reduction for YDC. This presumably resulted from enhanced charge transfer due to the mixed conductivity and/or enhanced redox reaction rate of the interfacial layer. The LFA, which was apparently related to mass-transport processes, grew with decreasing YSZ surface roughness and increasing interlayer thickness. The overall interfacial resistance was minimized for layer thicknesses of {approximately} 0.5 {micro}m. The lowest interfacial resistances in 97% H{sub 2} + H{sub 2}O, 0.13 {Omega} cm{sup 2} at 750 C, and 0.29 {Omega}cm{sup 2} at 600 C, were obtained with 0.5 {micro}m thick YDC interfacial layers.},
doi = {10.1149/1.1838542},
journal = {Journal of the Electrochemical Society},
number = 5,
volume = 145,
place = {United States},
year = {1998},
month = {5}
}