Structural analysis, phase stability and electrochemical characterization of Nb doped BaCe0.9Y0.1O3−x electrolyte for IT-SOFCs

Antonino Martorana, Francesco Giannici, Chiara Pugnalini, Alessandra D'Epifanio, Alessandra D'Epifanio, Elisabetta Di Bartolomeo, Silvia Licoccia, Alessandro Longo

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)

Abstract

To improve the chemical stability of high temperature proton conductors based on barium cerate, electrolyte powders doped with different amounts of niobium were synthesized by the citrate–nitrate auto-combustion method. Pure single phases of BaCe0.9−xNbxY0.1O3−x (BCYN, 0.03 ≤ x ≤ 0.12) were obtained by thermal treatment at 1000 °C. Sintering at 1450 °C for 10 h produced dense pellets. X-ray absorption spectroscopy allowed to define the dopant ion insertion site and the co-dopant valency. Treatments in pure CO2 atmosphere at 700 °C for 3 h and subsequent XRD analysis were carried out to probe the chemical stability of the produced electrolytes. The influence of the presence of Nb5+ on conductivity has been investigated by electrochemical impedance spectroscopy (EIS) measurements. Polarization curves were acquired in the 400–750 °C temperature range.
Original languageEnglish
Pages (from-to)201-206
Number of pages6
JournalJournal of Power Sources
Volume199
Publication statusPublished - 2012

All Science Journal Classification (ASJC) codes

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

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