title: Enhanced CO2 Resistance for Robust Oxygen Separation Through Tantalum-doped Perovskite Membranes.
abstract: Oxygen selective membranes with enhanced oxygen permeability and CO2 resistance are highly required in sustainable clean energy generation technologies. Here, we present novel, cobalt-free, SrFe1-x Tax O3-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). SrFe0.95 Ta0.05 O3-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 SrFeO3-δ (SF) enhanced the CO2 resistance of the membranes significantly as evidenced by the absence of the carbonate functional groups on the FTIR spectrum when exposed to CO2 atmosphere at 850 °C. The CO2 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% CO2 atmosphere.
authors.affiliation: Department of Chemical Engineering, Curtin University, Perth, Western Australia, 6845, Australia.
authors.forename: Chi
authors.initials: C
authors.lastname: Zhang
authors.affiliation: Department of Chemical Engineering, Curtin University, Perth, Western Australia, 6845, Australia.
authors.forename: Hao
authors.initials: H
authors.lastname: Tian
authors.affiliation: School of Chemical Engineering, Shandong University of Technology, Zibo, 255049, China.
authors.forename: Dong
authors.initials: D
authors.lastname: Yang
authors.affiliation: Department of Chemical Engineering, Curtin University, Perth, Western Australia, 6845, Australia. jaka.sunarso@curtin.edu.au.
authors.forename: Jaka
authors.identifier: http://orcid.org/0000-0002-5234-7431
authors.initials: J
authors.lastname: Sunarso
authors.affiliation: Department of Chemical Engineering, Curtin University, Perth, Western Australia, 6845, Australia. shaomin.liu@curtin.edu.au.
authors.forename: Jian
authors.initials: J
authors.lastname: Liu
authors.affiliation: Department of Chemical Engineering, Curtin University, Perth, Western Australia, 6845, Australia. barryjakasunarso@yahoo.com.
authors.forename: Shaomin
authors.initials: S
authors.lastname: Liu
mesh_terms: D017610:Calcium Compounds / Q000737:chemistry*; D002245:Carbon Dioxide / Q000737:chemistry*; D008567:Membranes, Artificial; D017348:Microscopy, Electron, Scanning Transmission; D010087:Oxides / Q000737:chemistry*; D010100:Oxygen / Q000737:chemistry*; D010539:Permeability; D056951:Photoelectron Spectroscopy; D017550:Spectroscopy, Fourier Transform Infrared; D013635:Tantalum / Q000737:chemistry*; D013696:Temperature; D014025:Titanium / Q000737:chemistry*
chemical_list: D017610:Calcium Compounds; D008567:Membranes, Artificial; D010087:Oxides; C059910:perovskite; D002245:Carbon Dioxide; D013635:Tantalum; D014025:Titanium; D010100:Oxygen
keywords: doping; membrane; oxygen; perovskite; tantalum