Atomic-resolution analysis of degradation phenomena in SOFCS: a case study of SO2 poisoning in LSM cathodes

Takeshi Daio; Pratoy Mitra; Stephen M. Lyth; Kazunari Sasaki

doi:10.1016/j.ijhydene.2016.05.216

Atomic-resolution analysis of degradation phenomena in SOFCS: a case study of SO₂ poisoning in LSM cathodes

Takeshi Daio, Pratoy Mitra, Stephen M. Lyth^*, Kazunari Sasaki

^*Corresponding author for this work

Chemical And Process Engineering

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

21 Citations (Scopus)

28 Downloads (Pure)

Abstract

Solid oxide fuel cell (SOFC) degradation studies are often performed by scanning transmission electron microscopy (STEM), scanning electron microscopy (SEM), and X-ray diffraction (XRD). However, it is difficult to use these techniques to observe processes occurring at the smallest scales. Here, we study sulfur poisoning of La_0.8Sr_0.2MnO_3−δ (LSM) cathodes as a model case for atomic resolution scanning transmission electron microscopy (STEM) analysis with energy dispersive X-ray diffraction (EDX). Significant SrSO₄ nanoparticle formation is observed after SO₂ exposure, especially at grain boundaries in the LSM. In addition, La₂O₃ formation inside the grain was also confirmed. The formation of SrSO₄ is identified with irreversible SOFC degradation, in addition to simple SO₂ adsorption, which is reversible.

Original language	English
Pages (from-to)	12214-12221
Number of pages	8
Journal	International Journal of Hydrogen Energy
Volume	41
Issue number	28
Early online date	11 Jun 2016
DOIs	https://doi.org/10.1016/j.ijhydene.2016.05.216
Publication status	Published - 27 Jul 2016

Funding

This research is supported by the Japan Science and Technology Agency (JST) through its “Center of Innovation” Science and Technology based Radical Innovation and Entrepreneurship Program (COI Program) to establish advanced analytical methods for fuel cells. The International Institute for Carbon-Neutral Energy Research is supported by World Premier International Research Center Initiative (WPI), MEXT, Japan .

Keywords

cathodes
degradation
microscopy
poisoning
SOFC
sulfur
catalyst poisoning
microscopic examination
solid oxide fuel cells (SOFC)
fuel cells

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1016/j.ijhydene.2016.05.216

Daio-etal-IJHE2016-Atomic-resolution-analysis-degradation-phenomena-SOFCS-case-study-SO2-poisoning-LSM-cathodesAccepted author manuscript, 1.33 MBLicence: CC BY-NC-ND 4.0

Cite this

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title = "Atomic-resolution analysis of degradation phenomena in SOFCS: a case study of SO2 poisoning in LSM cathodes",

abstract = "Solid oxide fuel cell (SOFC) degradation studies are often performed by scanning transmission electron microscopy (STEM), scanning electron microscopy (SEM), and X-ray diffraction (XRD). However, it is difficult to use these techniques to observe processes occurring at the smallest scales. Here, we study sulfur poisoning of La0.8Sr0.2MnO3−δ (LSM) cathodes as a model case for atomic resolution scanning transmission electron microscopy (STEM) analysis with energy dispersive X-ray diffraction (EDX). Significant SrSO4 nanoparticle formation is observed after SO2 exposure, especially at grain boundaries in the LSM. In addition, La2O3 formation inside the grain was also confirmed. The formation of SrSO4 is identified with irreversible SOFC degradation, in addition to simple SO2 adsorption, which is reversible.",

keywords = "cathodes, degradation, microscopy, poisoning, SOFC, sulfur, catalyst poisoning, microscopic examination, solid oxide fuel cells (SOFC), fuel cells",

author = "Takeshi Daio and Pratoy Mitra and Lyth, {Stephen M.} and Kazunari Sasaki",

note = "Funding Information: This research is supported by the Japan Science and Technology Agency (JST) through its “Center of Innovation” Science and Technology based Radical Innovation and Entrepreneurship Program (COI Program) to establish advanced analytical methods for fuel cells. The International Institute for Carbon-Neutral Energy Research is supported by World Premier International Research Center Initiative (WPI), MEXT, Japan . Publisher Copyright: {\textcopyright} 2016 Hydrogen Energy Publications LLC Takeshi Daio, Pratoy Mitra, Stephen M. Lyth, Kazunari Sasaki, Atomic-resolution analysis of degradation phenomena in SOFCS: A case study of SO2 poisoning in LSM cathodes, International Journal of Hydrogen Energy, Volume 41, Issue 28, 2016, Pages 12214-12221, https://doi.org/10.1016/j.ijhydene.2016.05.216 ",

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AU - Sasaki, Kazunari

N1 - Funding Information: This research is supported by the Japan Science and Technology Agency (JST) through its “Center of Innovation” Science and Technology based Radical Innovation and Entrepreneurship Program (COI Program) to establish advanced analytical methods for fuel cells. The International Institute for Carbon-Neutral Energy Research is supported by World Premier International Research Center Initiative (WPI), MEXT, Japan . Publisher Copyright: © 2016 Hydrogen Energy Publications LLC Takeshi Daio, Pratoy Mitra, Stephen M. Lyth, Kazunari Sasaki, Atomic-resolution analysis of degradation phenomena in SOFCS: A case study of SO2 poisoning in LSM cathodes, International Journal of Hydrogen Energy, Volume 41, Issue 28, 2016, Pages 12214-12221, https://doi.org/10.1016/j.ijhydene.2016.05.216

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N2 - Solid oxide fuel cell (SOFC) degradation studies are often performed by scanning transmission electron microscopy (STEM), scanning electron microscopy (SEM), and X-ray diffraction (XRD). However, it is difficult to use these techniques to observe processes occurring at the smallest scales. Here, we study sulfur poisoning of La0.8Sr0.2MnO3−δ (LSM) cathodes as a model case for atomic resolution scanning transmission electron microscopy (STEM) analysis with energy dispersive X-ray diffraction (EDX). Significant SrSO4 nanoparticle formation is observed after SO2 exposure, especially at grain boundaries in the LSM. In addition, La2O3 formation inside the grain was also confirmed. The formation of SrSO4 is identified with irreversible SOFC degradation, in addition to simple SO2 adsorption, which is reversible.

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