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Enhanced CO 2 Resistance for Robust Oxygen Separation Through Tantalum‐doped Perovskite Membranes
Author(s) -
Zhang Chi,
Tian Hao,
Yang Dong,
Sunarso Jaka,
Liu Jian,
Liu Shaomin
Publication year - 2016
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201501395
Subject(s) - oxygen permeability , membrane , oxygen , perovskite (structure) , orthorhombic crystal system , permeation , doping , materials science , activation energy , tantalum , chemical engineering , chemistry , analytical chemistry (journal) , inorganic chemistry , crystallography , crystal structure , chromatography , organic chemistry , metallurgy , biochemistry , optoelectronics , engineering
Oxygen selective membranes with enhanced oxygen permeability and CO 2 resistance are highly required in sustainable clean energy generation technologies. Here, we present novel, cobalt‐free, SrFe 1− x Ta x O 3− δ ( x =0, 0.025, 0.05, 0.1, 0.2) perovskite membranes. Ta‐doping induced lattice structure progression from orthorhombic ( x =0) to cubic ( x =0.05). SrFe 0.95 Ta 0.05 O 3− δ (SFT0.05) showed the highest oxygen flux rates reaching 0.85 mL min −1 cm −2 at 950 °C on a 1.0 mm‐thick membrane. Surface decoration can increase the permeation rate further. Ta inclusion within the perovskite lattice of SrFeO 3− δ (SF) enhanced the CO 2 resistance of the membranes significantly as evidenced by the absence of the carbonate functional groups on the FTIR spectrum when exposed to CO 2 atmosphere at 850 °C. The CO 2 resistance of Ta‐doped SF compounds correlates with the lower basicity and the higher binding energy for the lattice oxygen. SFT0.05 demonstrated high stability during long‐term permeation tests under 10 % CO 2 atmosphere.