Hydrogen permeation through dual-phase ceramic membrane derived from automatic phase-separation of SrCe0.50Fe0.50O3-δ precursor. (7th February 2020)

• Record Type: Journal Article
• Authors: Jia, Lujian; Ashtiani, Saeed; Liang, Fangyi; He, Guanghu; Jiang, Heqing
• Is Part Of: International journal of hydrogen energy. Volume 45:Number 7(2020)
• Page Start: 4625
• Page End: 4634
• Publication Date: 2020-02-07
• Subjects: Hydrogen permeation -- Automatic phase-separation -- Dual-phase membrane -- Mixed protonic-electronic conductor -- CO2 stability; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2019.11.241
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: Dense ceramic membranes with mixed protonic-electronic conductivity have been widely studied because of their 100% H2 selectivity and directly integrated advantage with high-temperature chemical reactions. In this study, Sr-based dual-phase ceramic membrane SrCe0.95 Fe0.05 O3-δ -SrFe0.95 Ce0.05 O3-δ (SCF-SFC) with mixed protonic-electronic conductivity was obtained by automatic phase-separation of SrCe0.5 Fe0.5 O3-δ (SCF55) precursor. After calcination at 1350 °C, the rationally designed SCF55 precursor auto-decomposed into two thermodynamically stable oxides: Ce-rich phase SrCe0.95 Fe0.05 O3-δ and Fe-rich phase SrFe0.95 Ce0.05 O3-δ that functioned as protonic and electronic conductors, respectively. The compositions and microstructures of the auto-formed phases were studied via XRD and SEM analyses. The dual-phase SCF-SFC membrane shows a high hydrogen permeation flux of 0.38 mL min −1 cm −2 at 940 °C. Stability tests indicated that the SCF-SFC membrane exhibited higher and more stable hydrogen permeation flux with less degradation under CO2 -containing atmospheres compared with the BaCe0.15 Fe0.85 O3-δ -BaCe0.85 Fe0.15 O3-δ (BCF-BFC) membrane. This significant improvement can be attributed to the lower CO2 adsorption and reduced carbonate formation which is indicated by thermogravimetric analysis. Highlights: Dual-phase membrane was developed by novel automatic phase-separation of precursor. Two phases are well-distributed and form a percolation network. A H2 permeation flux of 0.38 mL min −1 cm −2 was achieved at 940 °C. SCF-SFC membrane shows higher CO2 -tolerance than BCF-BFC membrane.