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Text from PDF Page: 001 processes Article CO2-Tolerant Oxygen Permeation Membranes Containing Transition Metals as Sintering Aids with High Oxygen Permeability Xiaopeng Wang 1,†, Lei Shi 1,†, Yanhao Huang 1, Lingyong Zeng 1, Mebrouka Boubeche 1 , Dongcheng Li 1 and Huixia Luo 1,2,3,4,* Citation: Wang,X.;Shi,L.;Huang,Y.; Zeng, L.; Boubeche, M.; Li, D.; Luo, H. CO2-Tolerant Oxygen Permeation Membranes Containing Transition Metals as Sintering Aids with High Oxygen Permeability. Processes 2021, 9, 528. https://doi.org/10.3390/ pr9030528 Academic Editor: Nariman Yousefi Received: 10 February 2021 Accepted: 11 March 2021 Published: 15 March 2021 Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affil- iations. Copyright: © 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https:// creativecommons.org/licenses/by/ 4.0/). 1 2 3 4 * Correspondence: firstname.lastname@example.org; Tel.: +86-020-3938-6124 † These authors contributed equally to this work. Abstract: Chemical doping of ceramic oxides may provide a possible route for realizing high- efficient oxygen transport membranes. Herein, we present a study of the previously unreported dual-phase mixed-conducting oxygen-permeable membranes with the compositions of 60 wt.% Ce0.85Pr0.1M0.05O2-δ-40 wt.%Pr0.6Sr0.4Fe0.8Al0.2O3-δ (M = Fe, Co, Ni, Cu) (CPM-PSFA) adding sinter- ing aids, which is expected to not only improve the electronic conductivity of fluorite phase, but also reduce the sintering temperature and improve the sintering properties of the membranes. X-ray pow- der diffraction (XRD) results indicate that the CPM-PSFA contain only the fluorite and perovskite two phases, implying that they are successfully prepared with a modified Pechini method. Backscattered scanning electron microscopy (BSEM) results further confirm that two phases are evenly distributed, and the membranes are very dense after sintering at 1275 ◦C for 5 h, which is much lower than that (1450 ◦C, 5 h) of the composite 60 wt.%Ce0.9Pr0.1O2-δ-40 wt.%Pr0.6Sr0.4Fe0.8Al0.2O3-δ (CP-PSFA) without sintering aids. The results of oxygen permeability test demonstrate that the oxygen per- meation flux through the CPCu-PSFA and CPCo-PSFA is higher than that of undoped CP-PSFA and can maintain stable oxygen permeability for a long time under pure CO2 operation condition. Our results imply that these composite membranes with high oxygen permeability and stability provide potential candidates for the application in oxygen separation, solid oxide fuel cell (SOFC), and oxy-fuel combustion based on carbon dioxide capture. Keywords: oxygen separation; composite membrane; al-containing oxides; modified one-pot Pechini method; sintering aids 1. Introduction There has long been interest in ceramic mixed-conducting oxygen transport mem- branes (OTMs) technology in virtue of their widespread applications in the energy cat- alytic fields such as air separation [1–4], cathodes in solid oxide fuel cells (SOFCs) [5,6], hydrocarbons conversion [7–9], hydrogen separation/production [10–13], and oxy-fuel combustion for CO2 capture [14–18]. Especially, the OTMs with high CO2 tolerance have great prospects to be used in oxy-fuel combustion integrated with CO2 capture, which provides an effective way to minimize the emission of CO2 and toxic NOx pollutants from School of Materials Science and Engineering, Sun Yat-Sen University, No. 135, Xingang Xi Road, Guangzhou 510275, China; email@example.com (X.W.); firstname.lastname@example.org (L.S.); email@example.com (Y.H.); firstname.lastname@example.org (L.Z.); email@example.com (M.B.); firstname.lastname@example.org (D.L.) State Key Laboratory of Optoelectronic Materials and Technologies, No. 135, Xingang Xi Road, Guangzhou 510275, China Key Lab of Polymer Composite and Functional Materials, Sun Yat-Sen University, No. 135, Xingang Xi Road, Guangzhou 510275, China Guangzhou Key Laboratory of Flexible Electronic Materials and Wearable Devices, Sun Yat-Sen University, No. 135, Xingang Xi Road, Guangzhou 510275, China Processes 2021, 9, 528. https://doi.org/10.3390/pr9030528 https://www.mdpi.com/journal/processes
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