YSZ-Based Dual-Phase\nMembrane Reactors for H<sub>2</sub> Production by Coupling Water Splitting\nwith CO<sub>2</sub> Capture

Mixed ionic-electronic conducting (MIEC) membrane reactors\nare\na promising technology for H<sub>2</sub> production through coupling\nof H<sub>2</sub>O splitting with CO<sub>2</sub> capture. To meet the\nhigh reliability requirement to the membrane reactors for an industrial\nprocess, it is necessary to develop membrane materials with high mechanical\nstrength and high chemical stability. In this work, a series of <i>x</i> wt % YSZ-(98 – <i>x</i>) wt % La<sub>0.7</sub>Sr<sub>0.27</sub>Cr<sub>0.4</sub>Fe<sub>0.6</sub>O<sub>3−δ</sub>-2 wt % CuO (<i>x</i> = 40, 50, 60 and 70; denoted as YL4,\nYL5, YL6, and YL7, respectively) dual-phase membranes were prepared\nfor coupling water splitting with CO<sub>2</sub> capture. The results\ndemonstrate that the mechanical strength of the dual-phase membrane\nincreases significantly with the addition of YSZ and is much higher\nthan that of the single perovskite material LSCF. The conductivity\nand H<sub>2</sub> production rates increase in the order of YL4 >\nYL5 > YL6 > YL7. The structure stability of the perovskite phase\nin\ndual-phase membranes increases with the content of YSZ phase under\nthe operation condition of membrane reactors. The YL6-based membrane\nreactor was operated steadily for 290 h, indicating that it is a promising\nmembrane material for H<sub>2</sub> production by coupling water splitting\nwith CO<sub>2</sub> capture.