Jump to main content
Jump to site search

Issue 11, 2012
Previous Article Next Article

Improvement of transport properties and hydrogen permeation of chemically-stable proton-conducting oxides based on the system BaZr1-x-yYxMyO3-δ

Author affiliations

Abstract

The structural and transport properties as well as the chemical stability of a series of proton-conducting oxides based on yttrium-doped barium zirconate were investigated. Specifically, Pr-, Fe- and Mn-doped BaZr1-x-yYxMyO3-δ compounds were prepared by solid state reaction. The compound exhibiting the highest total and protonic conductivity at elevated temperatures under reducing atmospheres was BaZr0.8Y0.15Mn0.05O3-δ. Temperature-programmed reduction experiments revealed a particular redox behavior related to the Mn-species under selected conditions. The hydrogen permeation was thoroughly studied as a function of the temperature, hydrogen concentration and the humidification degree in the sweep gas. Moreover, the transient processes induced by alternate step changes in the humidification degree of the sweep gas were analysed. The highest steady hydrogen evolution flow exceeded 0.03 ml min−1 cm−2 (0.9 mm-thick membrane) at 1000 °C for the humidified sweep gas. The stability of BaZr0.8Y0.15M0.05O3-δ under operation-relevant atmospheres (CO2-rich reducing atmosphere at high temperature) was tested using different techniques (X-ray diffraction (XRD), Raman, SEM, TEM and TG) and the results showed that this material is stable even when exposed to 115 ppm H2S.

Graphical abstract: Improvement of transport properties and hydrogen permeation of chemically-stable proton-conducting oxides based on the system BaZr1-x-yYxMyO3-δ

Back to tab navigation
Please wait while Download options loads

Supplementary files

Publication details

The article was received on 07 Feb 2012, accepted on 18 Mar 2012 and first published on 20 Mar 2012


Article type: Paper
DOI: 10.1039/C2RA20214J
Citation: RSC Adv., 2012,2, 4932-4943
  •   Request permissions

    Improvement of transport properties and hydrogen permeation of chemically-stable proton-conducting oxides based on the system BaZr1-x-yYxMyO3-δ

    S. Escolástico, M. Ivanova, C. Solís, S. Roitsch, W. A. Meulenberg and J. M. Serra, RSC Adv., 2012, 2, 4932
    DOI: 10.1039/C2RA20214J

Search articles by author