Benchmarking the ambipolar conductivity of composite electrolytes for gas separation membranes
authors Patricio, SG; Marques, FMB
nationality International
journal INTERNATIONAL JOURNAL OF ENERGY RESEARCH
author keywords composite electrolytes; impedance spectroscopy; ambipolar conductivity; ceria; alkaline carbonates; electrical microstructure; CO2 separation membranes
keywords CARBON-DIOXIDE SEPARATION; DUAL-PHASE MEMBRANES; HIGH-TEMPERATURE; ION-TRANSPORT; FUEL-CELLS; PERFORMANCE; PERMEATION; OXIDE; STABILITY; DIFFUSION
abstract Composite electrolytes including an oxide (Gd-doped ceria, 70, 80, and 90vol%) and a eutectic mixture of alkaline carbonates (Na2CO3 and Li2CO3) were produced by joint milling and firing of all constituents. The microstructure of these composites was studied by scanning electron microscopy/energy-dispersive X-ray spectroscopy, and they were further studied by impedance spectroscopy in air. Analysis of impedance data at low and high temperature was used to separate the electrical performance of each constituent phase, providing valuable information on the membrane electrical microstructure. Furthermore, a new tool is introduced for the assessment of the electrical microstructure efficiency of composite membranes, as a diagram relating the partial ionic transport numbers of main charge carriers and the membrane ambipolar conductivity. Using this type of diagram, the electrical features of actual composite membranes were mapped against an ideal membrane performance where microstructural effects are absent. The potential of this procedure to benchmark and discriminate the electrical characteristics of distinct membranes is demonstrated in this manner. Copyright (c) 2016 John Wiley & Sons, Ltd.
publisher WILEY-BLACKWELL
issn 0363-907X
year published 2016
volume 40
issue 15
beginning page 2150
ending page 2161
digital object identifier (doi) 10.1002/er.3596
web of science category Energy & Fuels; Nuclear Science & Technology
subject category Energy & Fuels; Nuclear Science & Technology
unique article identifier WOS:000387136000010
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