On the manufacture of silver-BaCe0.5Zr0.3Y0.16Zn0.04O3-delta composites for hydrogen separation membranes

Enrique Ruiz-Trejo*, Yuning Zhou, Nigel P. Brandon

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

Silver- BaCe0.5Zr0.3Y0.16Zn0.04O3-delta (Ag/BCZYZ) composites were investigated due to their potential application as hydrogen separation membranes, with emphasis on their fabrication and characterization. A precursor powder of BCZYZ was prepared via a wet chemical route and characterized by XRD, SEM and dilatometry. The precursor powder was coated with silver using Tollens reaction and then sintered under a variety of conditions. It was possible to obtain dense samples with a low level of non-percolating silver (2 vol%). Silver was present even if sintered at 1300 degrees C as it remained trapped in the ceramic matrix. The overall conductivity of a dense sample with 2 vol% of silver increased when compared to pure BCZYZ, and in particular the grain boundary resistance decreased considerably. A measurement of the open circuit voltage in fuel cell mode indicates the presence of mixed electronic-protonic conductivity in the composite. Copyright (C) 2015, The Authors. Published by Elsevier Ltd on behalf of Hydrogen Energy Publications, LLC.

Original languageEnglish
Pages (from-to)4146-4153
Number of pages8
JournalInternational Journal of Hydrogen Energy
Volume40
Issue number11
DOIs
Publication statusPublished - 22 Mar 2015

Keywords

  • Proton conductors
  • Hydrogen separation
  • Cermet composites
  • Mixed protonic electronic conduction
  • OXYGEN SEPARATION
  • CERMET
  • BACEO3
  • ELECTROLYTE
  • PERMEATION
  • STABILITY
  • DIFFUSION
  • EXPANSION
  • YB

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