Electrochemical response of highly porous percolative cgo electrospun membranes

Rafael Hubert Silva*, Vincenzo Esposito, Apiwat Dankeaw, Carlos Pérez Bergmann, Debora Marani

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

Electrochemical Impedance Spectroscopy (EIS) is here used to characterize highly porous Ce0.9 Gd0.1 O1.95 (CGO, ca. 90% vol. of porosity) free-supporting nano-fibrous thick (100 µm) membranes, fabricated via an electrospinning technique. The investigation of the calcination temperature influence on the microstructure indicates an evolution of the single nanofiber’s microstructure with a gradual grain growth from densely packed polycrystalline to pearl collar-like structures at increasing temperatures. This evolution is accompanied by brittleness for samples treated at temperatures above 800 C. The electrochemical characterization suggests an ionic percolative conductivity that exploits both the bulk-lattice conduction along the individual nanofibers and interfacial conduction across different nanofibers at their intersections. Optimized membranes treated at 600 and 700 C exhibit a similar electrochemical bulk response, but different interfacial electrochemical behavior (low frequency) associated with a grain size effect.

Original languageEnglish
Article number756
JournalCatalysts
Volume10
Issue number7
Number of pages13
ISSN2073-4344
DOIs
Publication statusPublished - 2020

Keywords

  • Ceria
  • Grain sizes
  • Impedance spectroscopy
  • Ionic conductivity
  • Nanofibers

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