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

被引：50

作者：

Escolastico, Sonia ^{[1
]}

Ivanova, Mariya ^{[2
]}

Solis, Cecilia ^{[1
]}

Roitsch, Stefan ^{[3
]}

Meulenberg, Wilhelm A. ^{[2
]}

Serra, Jose M. ^{[1
]}

机构：

[1] Univ Politecn Valencia, Inst Tecnol Quim, Consejo Super Invest Cient, E-46022 Valencia, Spain

[2] Forschungszentrum Julich, Inst Energy & Climate Res IEK 1, D-52425 Julich, Germany

[3] Rhein Westfal TH Aachen, Ernst Ruska Ctr Microscopy & Spect Electrons, D-52074 Aachen, Germany

来源：

RSC ADVANCES | 2012年 / 2卷 / 11期

关键词：

DOPED BARIUM ZIRCONATE; SEPARATION; STRONTIUM; PERMEABILITY; STABILITY; CERATE;

D O I：

10.1039/c2ra20214j

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

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-delta 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-delta. 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 degrees C for the humidified sweep gas. The stability of BaZr0.8Y0.15M0.05O3-delta 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.

引用

页码：4932 / 4943

页数：12

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