Imaging of oxygen transport at SOFC cathode/electrolyte interfaces by a novel technique

Teruhisa Horita; Katsuhiko Yamaji; Natsuko Sakai; Yueping Xiong; Tohru Kato; Harumi Yokokawa; Tatsuya Kawada

doi:10.1016/S0378-7753(01)01017-5

Imaging of oxygen transport at SOFC cathode/electrolyte interfaces by a novel technique

Teruhisa Horita, Katsuhiko Yamaji, Natsuko Sakai, Yueping Xiong, Tohru Kato, Harumi Yokokawa, Tatsuya Kawada

ENV - Environmental Studies for Advanced Society

Research output: Contribution to journal › Conference article › peer-review

92 Citations (Scopus)

Abstract

Oxygen transport was examined around the O₂/cathode/yttria-stabilized zirconia (YSZ) interfaces in solid oxide fuel cells (SOFCs). To visualize the kinetics of oxygen transport, isotope oxygen exchange (¹⁶O/¹⁸O exchange) and secondary ion mass spectrometry analysis (SIMS) were adopted for La_0.85Sr_0.15MnO₃-mesh and gold (Au)-mesh cathodes. The mesh cathode surfaces promoted oxygen adsorption and surface oxygen exchange. Oxygen bulk diffusion in the mesh cathode was observed only at the La_0.85Sr_0.15MnO₃-mesh. The active sites for oxygen incorporation were compared at the YSZ surfaces after removing the mesh cathodes. The La_0.85Sr_0.15MnO₃-mesh/YSZ interface can be the active site for oxygen incorporation as well as the triple phase boundary (TPB). On the other hand, the Au/YSZ interface showed low ¹⁸O concentration, and the active sites were limited to the TPB lines. Most active sites for oxygen incorporation were the O₂/cathode/YSZ interface (TPB) for La_0.85Sr_0.15MnO₃-mesh and Au-mesh from the line analysis of the SIMS images. The expansion of the oxygen incorporation active site around the TPB was discussed on the basis of SIMS imaging analysis and electrochemical analysis.

Original language	English
Pages (from-to)	224-230
Number of pages	7
Journal	Journal of Power Sources
Volume	106
Issue number	1-2
DOIs	https://doi.org/10.1016/S0378-7753(01)01017-5
Publication status	Published - 2002 Apr 1
Event	7th Grove Fuel Cell Symposium, Grove VII - London, United Kingdom Duration: 2001 Sep 11 → 2001 Sep 13

Keywords

Cathode reaction
Isotope oxygen exchange
O/O exchange
Oxygen transport
Secondary ion mass spectrometry (SIMS)

ASJC Scopus subject areas

Renewable Energy, Sustainability and the Environment
Energy Engineering and Power Technology
Physical and Theoretical Chemistry
Electrical and Electronic Engineering

UN SDGs

This output contributes to the following Sustainable Development Goal(s)

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10.1016/S0378-7753(01)01017-5

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title = "Imaging of oxygen transport at SOFC cathode/electrolyte interfaces by a novel technique",

abstract = "Oxygen transport was examined around the O2/cathode/yttria-stabilized zirconia (YSZ) interfaces in solid oxide fuel cells (SOFCs). To visualize the kinetics of oxygen transport, isotope oxygen exchange (16O/18O exchange) and secondary ion mass spectrometry analysis (SIMS) were adopted for La0.85Sr0.15MnO3-mesh and gold (Au)-mesh cathodes. The mesh cathode surfaces promoted oxygen adsorption and surface oxygen exchange. Oxygen bulk diffusion in the mesh cathode was observed only at the La0.85Sr0.15MnO3-mesh. The active sites for oxygen incorporation were compared at the YSZ surfaces after removing the mesh cathodes. The La0.85Sr0.15MnO3-mesh/YSZ interface can be the active site for oxygen incorporation as well as the triple phase boundary (TPB). On the other hand, the Au/YSZ interface showed low 18O concentration, and the active sites were limited to the TPB lines. Most active sites for oxygen incorporation were the O2/cathode/YSZ interface (TPB) for La0.85Sr0.15MnO3-mesh and Au-mesh from the line analysis of the SIMS images. The expansion of the oxygen incorporation active site around the TPB was discussed on the basis of SIMS imaging analysis and electrochemical analysis.",

keywords = "Cathode reaction, Isotope oxygen exchange, O/O exchange, Oxygen transport, Secondary ion mass spectrometry (SIMS)",

author = "Teruhisa Horita and Katsuhiko Yamaji and Natsuko Sakai and Yueping Xiong and Tohru Kato and Harumi Yokokawa and Tatsuya Kawada",

year = "2002",

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doi = "10.1016/S0378-7753(01)01017-5",

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TY - JOUR

T1 - Imaging of oxygen transport at SOFC cathode/electrolyte interfaces by a novel technique

AU - Horita, Teruhisa

AU - Yamaji, Katsuhiko

AU - Sakai, Natsuko

AU - Xiong, Yueping

AU - Kato, Tohru

AU - Yokokawa, Harumi

AU - Kawada, Tatsuya

PY - 2002/4/1

Y1 - 2002/4/1

N2 - Oxygen transport was examined around the O2/cathode/yttria-stabilized zirconia (YSZ) interfaces in solid oxide fuel cells (SOFCs). To visualize the kinetics of oxygen transport, isotope oxygen exchange (16O/18O exchange) and secondary ion mass spectrometry analysis (SIMS) were adopted for La0.85Sr0.15MnO3-mesh and gold (Au)-mesh cathodes. The mesh cathode surfaces promoted oxygen adsorption and surface oxygen exchange. Oxygen bulk diffusion in the mesh cathode was observed only at the La0.85Sr0.15MnO3-mesh. The active sites for oxygen incorporation were compared at the YSZ surfaces after removing the mesh cathodes. The La0.85Sr0.15MnO3-mesh/YSZ interface can be the active site for oxygen incorporation as well as the triple phase boundary (TPB). On the other hand, the Au/YSZ interface showed low 18O concentration, and the active sites were limited to the TPB lines. Most active sites for oxygen incorporation were the O2/cathode/YSZ interface (TPB) for La0.85Sr0.15MnO3-mesh and Au-mesh from the line analysis of the SIMS images. The expansion of the oxygen incorporation active site around the TPB was discussed on the basis of SIMS imaging analysis and electrochemical analysis.

AB - Oxygen transport was examined around the O2/cathode/yttria-stabilized zirconia (YSZ) interfaces in solid oxide fuel cells (SOFCs). To visualize the kinetics of oxygen transport, isotope oxygen exchange (16O/18O exchange) and secondary ion mass spectrometry analysis (SIMS) were adopted for La0.85Sr0.15MnO3-mesh and gold (Au)-mesh cathodes. The mesh cathode surfaces promoted oxygen adsorption and surface oxygen exchange. Oxygen bulk diffusion in the mesh cathode was observed only at the La0.85Sr0.15MnO3-mesh. The active sites for oxygen incorporation were compared at the YSZ surfaces after removing the mesh cathodes. The La0.85Sr0.15MnO3-mesh/YSZ interface can be the active site for oxygen incorporation as well as the triple phase boundary (TPB). On the other hand, the Au/YSZ interface showed low 18O concentration, and the active sites were limited to the TPB lines. Most active sites for oxygen incorporation were the O2/cathode/YSZ interface (TPB) for La0.85Sr0.15MnO3-mesh and Au-mesh from the line analysis of the SIMS images. The expansion of the oxygen incorporation active site around the TPB was discussed on the basis of SIMS imaging analysis and electrochemical analysis.

KW - Cathode reaction

KW - Isotope oxygen exchange

KW - O/O exchange

KW - Oxygen transport

KW - Secondary ion mass spectrometry (SIMS)

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U2 - 10.1016/S0378-7753(01)01017-5

DO - 10.1016/S0378-7753(01)01017-5

M3 - Conference article

AN - SCOPUS:0036534662

VL - 106

SP - 224

EP - 230

JO - Journal of Power Sources

JF - Journal of Power Sources

SN - 0378-7753

IS - 1-2

T2 - 7th Grove Fuel Cell Symposium, Grove VII

Y2 - 11 September 2001 through 13 September 2001

ER -

Imaging of oxygen transport at SOFC cathode/electrolyte interfaces by a novel technique

Abstract

Keywords

ASJC Scopus subject areas

UN SDGs

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