Instability and growth of nanoscale Ce0.8Gd0.2O1.9/NiO infiltrate in Sr0.94Ti0.9Nb0.1O3-Zr0.84Y0.16O1.92 anodes for solid oxide fuel cells

Wei Zhang, Luise Theil Kuhn, Peter Stanley Jørgensen, Bhaskar Reddy Sudireddy, Janet Jonna Bentzen, Carlos Bernuy-Lopez, Sune Veltzé, Tania Ramos

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Abstract

Microstructural evolution of Ce0.8Gd0.2O 1.9/NiO (CGO/NiO) co-infiltrated nanoparticles in Sr 0.94Ti0.9Nb0.1O3-Zr 0.84Y0.16O1.92 (STN94-YSZ) anodes for solid oxide fuel cells (SOFCs) is investigated during electrochemical testing in a symmetric cell setup. The CGO/NiO infiltrated symmetric cells were subjected to varying atmospheres of H2O/H2 between 650 and 850 C and characterized by electrochemical impedance spectroscopy. Analytical high resolution transmission electron microscopy showed that the CGO/NiO infiltrate was found to coalesce and grow from an indistinguishable CGO/NiO fluorite structure of an average diameter of 5 nm to individual well-connected, but phase-separated, CGO and Ni particles of 50 nm in average. This study confirms that instability and growth of CGO/NiO infiltrates in STN-based SOFC electrodes affect the morphology and can potentially be linked to reported losses in electrochemical performance. © 2014 Elsevier B.V. All rights reserved.
Original languageEnglish
JournalJournal of Power Sources
Volume258
Pages (from-to)297-304
ISSN0378-7753
DOIs
Publication statusPublished - 2014

Keywords

  • SOFC
  • Anodes
  • Infiltrate
  • Gd-doped ceria
  • Nickel
  • Instability

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