resumo
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.
palavras-chave
DUAL-PHASE MEMBRANES; CARBON-DIOXIDE PERMEATION; MOLTEN ALKALI CARBONATES; OXIDE FUEL-CELLS; DOPED-CERIA; ELECTRICAL-CONDUCTIVITY; HIGH-TEMPERATURE; ELECTROLYTES; DIFFUSION; MIXTURES
categoria
Electrochemistry
autores
Marques, FMB; Patricio, SG; Muccillo, E; Muccillo, R
nossos autores
Fernando Manuel Bico Marques
Professor Catedrático
Sónia Gonçalves Patrício
Investigador AuxiliarGrupos
G3 - Materiais Eletroquímicos, Interfaces e Revestimentos
G5 - Materiais Biomiméticos, Biológicos e Vivos
Projectos
Multi-Functional Nanocomposite Materials For Low-Temperature Ceramic Fuel Cells (NANOMFC )
agradecimentos
Funding from FEDER/COMPETE and FCT (Portugal) via Project NANOMFC (New-INDIGO/0001/2013), and from Project CICECO-Aveiro Institute of Materials (Ref. FCT UID/CTM/50011/2013), financed by national funds through FCT/MEC and when appropriate co-financed by FEDER under the PT2020 Partnership Agreement is greatly appreciated. S. Patricio thanks FCT for the postdoctoral grant (SFRH/BPD/75943/2011) and F. Marques thanks CNPq (Brazil) for the grant PVE 401174/2012-3 as Special Invited Researcher at IPEN, S. Paulo.