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

Tsepin Tsai; Scott A. Barnett

doi:10.1149/1.1838542

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

Tsepin Tsai^*, Scott A. Barnett

^*Corresponding author for this work

Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

50 Scopus citations

Abstract

The interfacial resistance of Ni-Y₂O₃-stabilized ZrO₂ (Ni-YSZ) anodes on YSZ electrolytes has been reduced by inserting thin interfacial layers of TiO₂-doped YSZ (YZT) or Y₂O₃-doped CeO₂ (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 ∼0.5 μm. The lowest interfacial resistances in 97% H₂ + H₂O, 0.13 Ω cm² at 750°C, and 0.29 Ω cm² at 600°C, were obtained with 0.5 μm thick YDC interfacial layers.

Original language	English (US)
Pages (from-to)	1696-1701
Number of pages	6
Journal	Journal of the Electrochemical Society
Volume	145
Issue number	5
DOIs	https://doi.org/10.1149/1.1838542
State	Published - May 1998

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Renewable Energy, Sustainability and the Environment
Surfaces, Coatings and Films
Electrochemistry
Materials Chemistry

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10.1149/1.1838542

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title = "Effect of mixed-conducting interfacial layers on solid oxide fuel cell anode performance",

abstract = "The interfacial resistance of Ni-Y2O3-stabilized ZrO2 (Ni-YSZ) anodes on YSZ electrolytes has been reduced by inserting thin interfacial layers of TiO2-doped YSZ (YZT) or Y2O3-doped CeO2 (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 ∼0.5 μm. The lowest interfacial resistances in 97% H2 + H2O, 0.13 Ω cm2 at 750°C, and 0.29 Ω cm2 at 600°C, were obtained with 0.5 μm thick YDC interfacial layers.",

author = "Tsepin Tsai and Barnett, {Scott A.}",

year = "1998",

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doi = "10.1149/1.1838542",

language = "English (US)",

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pages = "1696--1701",

journal = "Journal of the Electrochemical Society",

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T1 - Effect of mixed-conducting interfacial layers on solid oxide fuel cell anode performance

AU - Tsai, Tsepin

AU - Barnett, Scott A.

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Y1 - 1998/5

N2 - The interfacial resistance of Ni-Y2O3-stabilized ZrO2 (Ni-YSZ) anodes on YSZ electrolytes has been reduced by inserting thin interfacial layers of TiO2-doped YSZ (YZT) or Y2O3-doped CeO2 (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 ∼0.5 μm. The lowest interfacial resistances in 97% H2 + H2O, 0.13 Ω cm2 at 750°C, and 0.29 Ω cm2 at 600°C, were obtained with 0.5 μm thick YDC interfacial layers.

AB - The interfacial resistance of Ni-Y2O3-stabilized ZrO2 (Ni-YSZ) anodes on YSZ electrolytes has been reduced by inserting thin interfacial layers of TiO2-doped YSZ (YZT) or Y2O3-doped CeO2 (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 ∼0.5 μm. The lowest interfacial resistances in 97% H2 + H2O, 0.13 Ω cm2 at 750°C, and 0.29 Ω cm2 at 600°C, were obtained with 0.5 μm thick YDC interfacial layers.

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

Abstract

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