Fabrication of lanthanum-based perovskites membranes on porous alumina hollow fibre (AHF) substrates for oxygen enrichment

Abstract

In this work, two types of lanthanum-based MIEC perovskite oxides, namely La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF) and La0.6Sr0.4Co0.2Ni0.8O3-δ (LSCNi), were deposited onto porous alumina hollow fibre (AHF) substrates and used for oxygen enrichment. Such structure was developed to shorten oxygen ion diffusion distances in dense membranes and simultaneously leading to higher oxygen flux. The perovskite oxides were prepared using Pechini sol-gel method and deposited via a vacuum-assisted technique. The deposition of lanthanum-based membranes onto the outer and inner sides of the porous AHF has been facilitated through numerous microchannels in the AHF substrates. The effects of operating temperature and argon sweep gas flowrate on oxygen permeation flux of lanthanum-based AHF membrane were investigated. The results revealed that the oxygen permeation flux of LSCF-AHF and LSCNi-AHF increased with operating temperatures due to the improvement of bulk diffusion and surface exchange properties after the lanthanum-based perovskite deposition. Higher oxygen flux was observed for LSCNi-AHF as LSCNi possessed balanced oxygen ionic and electronic conductivities as compared to LSCF membranes. Benefitting from improved oxygen activation and vacancy generation properties after Ni substitution into the B-site ion of LSC perovskite, a dramatic increased oxygen fluxes up to 4.5 mL/min·cm2 was observed at 950 °C. The present work demonstrated a feasible method for fabricating oxygen transport membrane (OTM) using porous AHF substrates.

Publication DOI: https://doi.org/10.1016/j.ceramint.2019.03.242
Divisions: College of Engineering & Physical Sciences
College of Engineering & Physical Sciences > Aston Institute of Materials Research (AIMR)
College of Engineering & Physical Sciences > Energy and Bioproducts Research Institute (EBRI)
Additional Information: © 2019, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/
Uncontrolled Keywords: Alumina hollow fibre,LSCF,MIEC perovskites,Oxygen enrichment,Oxygen permeation,Electronic, Optical and Magnetic Materials,Ceramics and Composites,Process Chemistry and Technology,Surfaces, Coatings and Films,Materials Chemistry
Full Text Link:
Related URLs: https://linking ... 272884219307977 (Publisher URL)
http://www.scop ... tnerID=8YFLogxK (Scopus URL)
PURE Output Type: Article
Published Date: 2019-07-01
Published Online Date: 2019-03-31
Accepted Date: 2019-03-30
Authors: Sihar, Ainun Sailah
Othman, Nur Hidayati
Alias, Nur Hashimah
Shahruddin, Munawar Zaman
Asghrar Syed-hassan, Syed Shatir
Rahman, Mukhlis A.
Ismail, Ahmad Fauzi
Wu, Zhentao (ORCID Profile 0000-0002-4934-8046)

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