Electrochemical characterization of Ni-Ce0.9Gd 0.1O2-δ for SOFC anodes

Bettina Rösch; Hengyong Tu; Andreas O. Störnier; Axel C. Müller; Ulrich Stimming

doi:10.1016/j.ssi.2004.09.022

Electrochemical characterization of Ni-Ce_0.9Gd _0.1O_2-δ for SOFC anodes

Bettina Rösch, Hengyong Tu, Andreas O. Störnier, Axel C. Müller, Ulrich Stimming

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Abstract

The electrochemical behaviour of Ni-Ce_0.9Gd_0.1O _2-□ (Ni-CGO) with a NiO content of 2.5 and 70 wt.% was investigated by impedance spectroscopy. Symmetrical cells with yttrium-stabilized zirconia as electrolyte were prepared with screen printing and then sintered at 1250°C for 5 h. The microstructure of the anode material after sintering was analysed by SEM. Impedance spectroscopy measurements were carried out in atmospheres containing H₂, CH ₄ and N₂ at various compositions humidified with 3% H ₂O in the temperature range 700-850°C. No visible carbon deposition on both electrodes was found after measurements in variable atmospheres of H₂ and CH₄ (Balance N₂) despite the high content of Ni. However, carbon deposition occurred on the anode with 70 wt.% NiO during continuous exposure in stability testing for 90 h in 97% CH₄/3% H₂O.

Originalsprache	Englisch
Seiten (von - bis)	113-117
Seitenumfang	5
Fachzeitschrift	Solid State Ionics
Jahrgang	175
Ausgabenummer	1-4
DOIs	https://doi.org/10.1016/j.ssi.2004.09.022
Publikationsstatus	Veröffentlicht - 30 Nov. 2004
Veranstaltung	Fourteenth International Conference on Solid State Ionics - Monterey, CA., USA/Vereinigte Staaten Dauer: 22 Juni 2003 → 27 Juni 2003

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title = "Electrochemical characterization of Ni-Ce0.9Gd 0.1O2-δ for SOFC anodes",

abstract = "The electrochemical behaviour of Ni-Ce0.9Gd0.1O 2-□ (Ni-CGO) with a NiO content of 2.5 and 70 wt.% was investigated by impedance spectroscopy. Symmetrical cells with yttrium-stabilized zirconia as electrolyte were prepared with screen printing and then sintered at 1250°C for 5 h. The microstructure of the anode material after sintering was analysed by SEM. Impedance spectroscopy measurements were carried out in atmospheres containing H2, CH 4 and N2 at various compositions humidified with 3% H 2O in the temperature range 700-850°C. No visible carbon deposition on both electrodes was found after measurements in variable atmospheres of H2 and CH4 (Balance N2) despite the high content of Ni. However, carbon deposition occurred on the anode with 70 wt.% NiO during continuous exposure in stability testing for 90 h in 97% CH4/3% H2O.",

keywords = "Anode, Impedance spectroscopy, Ni-CGO cermet, Solid oxide fuel cells",

author = "Bettina R{\"o}sch and Hengyong Tu and St{\"o}rnier, {Andreas O.} and M{\"u}ller, {Axel C.} and Ulrich Stimming",

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T1 - Electrochemical characterization of Ni-Ce0.9Gd 0.1O2-δ for SOFC anodes

AU - Rösch, Bettina

AU - Tu, Hengyong

AU - Störnier, Andreas O.

AU - Müller, Axel C.

AU - Stimming, Ulrich

PY - 2004/11/30

Y1 - 2004/11/30

N2 - The electrochemical behaviour of Ni-Ce0.9Gd0.1O 2-□ (Ni-CGO) with a NiO content of 2.5 and 70 wt.% was investigated by impedance spectroscopy. Symmetrical cells with yttrium-stabilized zirconia as electrolyte were prepared with screen printing and then sintered at 1250°C for 5 h. The microstructure of the anode material after sintering was analysed by SEM. Impedance spectroscopy measurements were carried out in atmospheres containing H2, CH 4 and N2 at various compositions humidified with 3% H 2O in the temperature range 700-850°C. No visible carbon deposition on both electrodes was found after measurements in variable atmospheres of H2 and CH4 (Balance N2) despite the high content of Ni. However, carbon deposition occurred on the anode with 70 wt.% NiO during continuous exposure in stability testing for 90 h in 97% CH4/3% H2O.

AB - The electrochemical behaviour of Ni-Ce0.9Gd0.1O 2-□ (Ni-CGO) with a NiO content of 2.5 and 70 wt.% was investigated by impedance spectroscopy. Symmetrical cells with yttrium-stabilized zirconia as electrolyte were prepared with screen printing and then sintered at 1250°C for 5 h. The microstructure of the anode material after sintering was analysed by SEM. Impedance spectroscopy measurements were carried out in atmospheres containing H2, CH 4 and N2 at various compositions humidified with 3% H 2O in the temperature range 700-850°C. No visible carbon deposition on both electrodes was found after measurements in variable atmospheres of H2 and CH4 (Balance N2) despite the high content of Ni. However, carbon deposition occurred on the anode with 70 wt.% NiO during continuous exposure in stability testing for 90 h in 97% CH4/3% H2O.

KW - Anode

KW - Impedance spectroscopy

KW - Ni-CGO cermet

KW - Solid oxide fuel cells

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U2 - 10.1016/j.ssi.2004.09.022

DO - 10.1016/j.ssi.2004.09.022

M3 - Conference article

AN - SCOPUS:10044230683

SN - 0167-2738

VL - 175

SP - 113

EP - 117

JO - Solid State Ionics

JF - Solid State Ionics

IS - 1-4

T2 - Fourteenth International Conference on Solid State Ionics

Y2 - 22 June 2003 through 27 June 2003