Phosphorus poisoning of Ni-cermet anodes in solid oxide fuel cells

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Chemical degradation of anodes in solid oxide fuel cells (SOFCs) induced by phosphorous impurities has been investigated by thermochemical calculations, electrochemical characterization, and microstructural analysis. Thermochemical calculations indicate that Ni phosphides (NimPn) such as Ni5P2 are readily formed under SOFC operational conditions even in the case where the concentration of phosphorous impurities is as low as ppb level. Phosphorous impurities in fuels resulted in the formation of the secondary phase Ni phosphides during operation especially at an operating temperature ∼1000°C. The formation of Ni phosphides and change in anode microstructure were confirmed by using a field-emission-scanning electron microscope coupled with an energy dispersive X-ray analyzer, scanning transmission electron microscope, and X-ray diffraction, leading to the fatal cell performance degradation in the manner that anodic overpotential increased, current incorporation was obstructed, and internal fuel reforming reaction was deactivated.

Original languageEnglish
JournalJournal of the Electrochemical Society
Volume157
Issue number11
DOIs
Publication statusPublished - 2010

Fingerprint

Cermet Cements
phosphides
poisoning
solid oxide fuel cells
Solid oxide fuel cells (SOFC)
Phosphorus
phosphorus
Anodes
anodes
Impurities
impurities
Electron microscopes
electron microscopes
degradation
Scanning
Degradation
scanning
Reforming reactions
operating temperature
Field emission

All Science Journal Classification (ASJC) codes

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

Cite this

Phosphorus poisoning of Ni-cermet anodes in solid oxide fuel cells. / Haga, K.; Shiratori, Yusuke; Nojiri, Y.; Ito, Kohei; Sasaki, Kazunari.

In: Journal of the Electrochemical Society, Vol. 157, No. 11, 2010.

Research output: Contribution to journalArticle

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abstract = "Chemical degradation of anodes in solid oxide fuel cells (SOFCs) induced by phosphorous impurities has been investigated by thermochemical calculations, electrochemical characterization, and microstructural analysis. Thermochemical calculations indicate that Ni phosphides (NimPn) such as Ni5P2 are readily formed under SOFC operational conditions even in the case where the concentration of phosphorous impurities is as low as ppb level. Phosphorous impurities in fuels resulted in the formation of the secondary phase Ni phosphides during operation especially at an operating temperature ∼1000°C. The formation of Ni phosphides and change in anode microstructure were confirmed by using a field-emission-scanning electron microscope coupled with an energy dispersive X-ray analyzer, scanning transmission electron microscope, and X-ray diffraction, leading to the fatal cell performance degradation in the manner that anodic overpotential increased, current incorporation was obstructed, and internal fuel reforming reaction was deactivated.",
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AU - Haga, K.

AU - Shiratori, Yusuke

AU - Nojiri, Y.

AU - Ito, Kohei

AU - Sasaki, Kazunari

PY - 2010

Y1 - 2010

N2 - Chemical degradation of anodes in solid oxide fuel cells (SOFCs) induced by phosphorous impurities has been investigated by thermochemical calculations, electrochemical characterization, and microstructural analysis. Thermochemical calculations indicate that Ni phosphides (NimPn) such as Ni5P2 are readily formed under SOFC operational conditions even in the case where the concentration of phosphorous impurities is as low as ppb level. Phosphorous impurities in fuels resulted in the formation of the secondary phase Ni phosphides during operation especially at an operating temperature ∼1000°C. The formation of Ni phosphides and change in anode microstructure were confirmed by using a field-emission-scanning electron microscope coupled with an energy dispersive X-ray analyzer, scanning transmission electron microscope, and X-ray diffraction, leading to the fatal cell performance degradation in the manner that anodic overpotential increased, current incorporation was obstructed, and internal fuel reforming reaction was deactivated.

AB - Chemical degradation of anodes in solid oxide fuel cells (SOFCs) induced by phosphorous impurities has been investigated by thermochemical calculations, electrochemical characterization, and microstructural analysis. Thermochemical calculations indicate that Ni phosphides (NimPn) such as Ni5P2 are readily formed under SOFC operational conditions even in the case where the concentration of phosphorous impurities is as low as ppb level. Phosphorous impurities in fuels resulted in the formation of the secondary phase Ni phosphides during operation especially at an operating temperature ∼1000°C. The formation of Ni phosphides and change in anode microstructure were confirmed by using a field-emission-scanning electron microscope coupled with an energy dispersive X-ray analyzer, scanning transmission electron microscope, and X-ray diffraction, leading to the fatal cell performance degradation in the manner that anodic overpotential increased, current incorporation was obstructed, and internal fuel reforming reaction was deactivated.

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