Open AccessElectrochemical, Catalytic and O2-Permeation Studies of Iron-Doped Barium Zirconates for Membrane Reactor Applications
Author(s) -
Haomiao Zhang,
Aravind Suresh,
C. Barry Carter,
Benjamin A. Wilhite
Publication year - 2014
Publication title -
ecs transactions
Language(s) - English
Resource type - Journals
eISSN - 1938-6737
pISSN - 1938-5862
DOI - 10.1149/06101.0307ecst
Subject(s) - dielectric spectroscopy , materials science , electrochemistry , permeation , perovskite (structure) , catalysis , zirconate , conductivity , barium , doping , analytical chemistry (journal) , partial pressure , inorganic chemistry , membrane , chemical engineering , chemistry , electrode , chromatography , oxygen , composite material , metallurgy , ceramic , organic chemistry , biochemistry , optoelectronics , engineering , titanate
An Fe-doped Barium Zirconate perovskite (Ba 0.9 Fe 0.1 Zr 0.9 O 3-δ ) is investigated for electrochemical and catalytic activity at 800 o C via combination of gas effluent mass spectroscopy and electrochemical impedance spectroscopy (EIS). Results confirm competitive reaction rates for both CO 2 reduction to CO and O 2 under dry-gas conditions and CO oxidation to CO 2 and H 2 in the presence of steam. A combination of both p-type and n-type semiconduction behavior is suggested to explain the complex dependence of electrical conductivity upon individual gas species partial pressure. Separate gas permeation measurements confirm an O 2 permeability of 9.52×10 -12 mol.m -1 .s -1 .Pa -1 , which is competitive with similarly reported zirconate-based perovskite materials.
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