Journal
ELECTROCHIMICA ACTA
Volume 210, Issue -, Pages 87-95Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2016.05.141
Keywords
CO2 separation membranes; composite electrolytes; ambipolar conductivity; equivalent circuit; Evans-type diagram
Categories
Funding
- FEDER/COMPETE (Portugal) via Project NANOMFC [New-INDIGO/0001/2013]
- FCT (Portugal) via Project NANOMFC [New-INDIGO/0001/2013]
- Project CICECO-Aveiro Institute of Materials - national funds through FCT/MEC [FCT UID/CTM/50011/2013]
- FEDER
- FCT [SFRH/BPD/75943/2011]
- CNPq (Brazil) [PVE 401174/2012-3]
- Fundação para a Ciência e a Tecnologia [SFRH/BPD/75943/2011] Funding Source: FCT
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A simple model on the performance of composite CO2 separation membranes (ceramic oxide-ion conductor and molten alkaline carbonates) is derived from an equivalent circuit comprising two interlinked cells, using the main electrical circuit component analogs of the electrochemical characteristics of each composite phase (thermodynamic voltages and ionic resistances) and surrounding gas phase activities of species involved in the surface reactions. A newly introduced graphical solution inspired in conventional corrosion diagrams is used to benchmark, map and discuss membrane performance, including the roles of cell inner ionic transport and surface/interface reaction processes. The impact of oxide phase composition (ZrO2, CeO2 and Bi2O3- based oxides), content (4090 vol%) and working temperature (873-973K) on membrane performance are assessed in detail, highlighting the limits of materials currently available. Selected examples of published data on membrane performance are used to demonstrate the efficacy of the suggested diagram and to comment on permeation kinetic constraints, namely phase tortuosity. (C) 2016 Elsevier Ltd. All rights reserved.
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