YSZ-Based Dual-Phase Membrane Reactors for H₂ Production by Coupling Water Splitting with CO₂ Capture

Abstract

Mixed ionic-electronic conducting (MIEC) membrane reactors are a promising technology for H 2 production through coupling of H 2 O splitting with CO 2 capture. To meet the high reliability requirement to the membrane reactors for an industrial process, it is necessary to develop membrane materials with high mechanical strength and high chemical stability. In this w o r k , a s e r i e s o f x w t % Y S Z -( 9 8 − x ) w t % La 0.7 Sr 0.27 Cr 0.4 Fe 0.6 O 3−δ -2 wt % CuO (x = 40, 50, 60 and 70; denoted as YL4, YL5, YL6, and YL7, respectively) dual-phase membranes were prepared for coupling water splitting with CO 2 capture. The results demonstrate that the mechanical strength of the dual-phase membrane increases significantly with the addition of YSZ and is much higher than that of the single perovskite material LSCF. The conductivity and H 2 production rates increase in the order of YL4 > YL5 > YL6 > YL7. The structure stability of the perovskite phase in dual-phase membranes increases with the content of YSZ phase under the operation condition of membrane reactors. The YL6-based membrane reactor was operated steadily for 290 h, indicating that it is a promising membrane material for H 2 production by coupling water splitting with CO 2 capture.