(523b) Hydrogen Generation Ability of Perovskite and Spinel Redox Materials Via Thermochemical Water Splitting

This study compare the hydrogen generation ability of the perovskite, ABO₃ (e.g A- Sr, Ba, Co, B- Mn, Zr, Fe, Ti) and spinel (AB₂O₄) redox materials via thermochemical water-splitting. Each of these class of materials were synthesized using the surfactant assisted sol-gel technique with alkoxide and salt precursors. As-prepared gels were dried and calcined at different temperatures of 500-700 ^oC. These powdered materials were analyzed for grain growth, specific surface area, phase composition, and crystalline structure using SEM/EDX, BET surface area analyzer and powdered X-ray diffraction. As-calcined materials were loaded as a packed-bed in the continuous Inconel tubular reactor and 5 thermochemical water-splitting cycles were performed at regeneration temperature of 1100^oC and water-splitting temperature of 900-1100^oC under the N₂ carrier gas flow rate of 35 SCCM. From the transient profiles obtained, H₂ volume was calculated, and the hydrogen generation ability of the perovskite and spinel redox materials is compared. The solid-state transport properties were also investigated using the electrochemical impedance spectroscopy. The hydrogen generation ability of the perovskite and spinel redox materials and process thermal efficiency will be presented.