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学科主题: 物理化学
题名: Degradation and stabilization of perovskite membranes containing silicon impurity at low temperature
作者: Liu, Yan1, 2;  Zhu, Xuefeng1;  Li, Mingrun1;  Li, Wenping1, 2;  Yang, Weishen1
通讯作者: 朱雪峰 ;  杨维慎
关键词: MIEC membrane ;  Silicon impurity ;  Low temperature ;  Degradation ;  Perovskite
刊名: JOURNAL OF MEMBRANE SCIENCE
发表日期: 2015-10-15
DOI: 10.1016/j.memsci.2015.05.063
卷: 492, 期:1, 页:173-180
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Technology ;  Physical Sciences
类目[WOS]: Engineering, Chemical ;  Polymer Science
研究领域[WOS]: Engineering ;  Polymer Science
英文摘要: The oxygen permeation flux of a mixed ionic-electronic conducting membrane BaCe0.1Co0.4Fe0.5O3-delta (BCCF) decreased by 62% after 477 h on-stream operation under air/He gradient at 600 degrees C. To understand this phenomenon, the spent membrane was examined via several characterization techniques. Scanning electron microscopy (SEM) and energy dispersive X-ray (EDS) analyses revealed that the surface of the sweep side has a higher silicon impurity content than that of the feed side. In fact, the BCCF powder contained up to 140 ppm of silicon impurities, which originated from the original chemicals and/or was introduced during preparation of the material. After the 477 h operation at 600 degrees C, a similar to 25 nm-thick amorphous silicon-containing layer was detected by high resolution transmission electron microscopy (HRTEM) on the sweep side surface of the spent membrane. A possible mechanism related to silicon migration from membrane bulk to surfaces was proposed to explain the degradation phenomenon. To overcome the negative effects of silicon impurity, a simple and effective method was proposed to stabilize the oxygen permeation fluxes at low temperatures, i.e. coating a porous Sm0.5Sr0.5CoO3-delta (SSC) catalyst on both surfaces of the membrane to accommodate the silicon impuriLy and accelerate oxygen exchange kinetics. With this method, the oxygen permeation was stabilized for 500 h at 600 degrees C. (C) 2015 Elsevier B.V. All rights reserved.
关键词[WOS]: OXYGEN PERMEABLE MEMBRANE ;  DUAL-PHASE MEMBRANES ;  MIXED-OXIDE (A,B)O ;  CERAMIC MEMBRANES ;  CATHODE MATERIAL ;  STRUCTURAL STABILITY ;  HYDROGEN-PRODUCTION ;  POTENTIAL GRADIENT ;  CO2 CAPTURE ;  FUEL-CELLS
语种: 英语
WOS记录号: WOS:000358433600019
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/143769
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100039, Peoples R China

Recommended Citation:
Liu, Yan,Zhu, Xuefeng,Li, Mingrun,et al. Degradation and stabilization of perovskite membranes containing silicon impurity at low temperature[J]. JOURNAL OF MEMBRANE SCIENCE,2015,492(1):173-180.
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