期刊
SEPARATION AND PURIFICATION TECHNOLOGY
卷 256, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.seppur.2020.117798
关键词
Hydrogen separation; Triple-conducting membrane; Water splitting; CO2-tolerance; Doped ceria
资金
- National Natural Science Foundation of China [21536005, 51761145107]
- Key Research & Development Project of Shandong (Major innovation projects) [2019JZZY010905]
- QIBEBT
- Dalian National Laboratory For Clean Energy, CAS [QIBEBT I201929]
By doping Gd-doped ceria (CGO) with excellent oxygen ionic conductivity into Sr-based hydrogen separation membranes, a novel triple-conducting (H+/O2-/e(-)) membrane, Ce0.90Gd0.10O3-delta-SrCe0.95Fe0.05O3 (-delta)-SrFe0.95Ce0.05O3-delta (CGO-SCF-SFC), was developed through automatic phase-separation of ceramic precursors. The membrane showed improved H-2 separation performance and enhanced CO2-tolerance, achieving a stable hydrogen separation flux of 0.33 mL min(-1) cm(-2) under CO2-containing atmospheres.
Ceramic hydrogen separation membrane based on mixed protonic-electronic conductor has received considerable attention due to the advantage of 100% H-2 selectivity. However, their widespread application faces two major hurdles including the limited hydrogen separation performance and chemical instability especially in CO2-containing atmospheres. Herein, using Gd-doped ceria (CGO) with excellent oxygen ionic conductivity to dope Sr-based hydrogen separation membrane, a novel triple-conducting (H+/O2-/e(-)) membrane Ce0.90Gd0.10O3-delta-SrCe0.95Fe0.05O3 (-delta)-SrFe0.95Ce0.05O3-delta (CGO-SCF-SFC) was developed via automatic phase-separation of ceramic precursor after high temperature sintering, which showed both improved H-2 separation performance and CO2-tolerance. The three chemically compatible phases CGO, SCF and SFC act as mainly oxygen-ionic conductor, protonic conductor and electronic conductor, respectively. The enhanced H-2 flux with value of 0.54 mL min(-1) cm(-2) was achieved at 940 degrees C, which was attributed to two parts: (1) hydrogen separated as proton through SCF-SFC network; (2) hydrogen produced from water splitting that is enhanced by in situ oxygen removal through CGO phase. Moreover, benefiting from the suppression of CO2 adsorption and carbonate formation, a stable hydrogen separation flux of 0.33 mL min(-1) cm(-2) was obtained under CO2-containing atmospheres, indicating the enhanced CO2-tolerance of the triple-conducting (H+/O2-/e(-)) membrane CGO-SCF-SFC in comparison with the membrane SCF-SFC.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据