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

Authors: 
Shende, R., South Dakota School of Mines and Technology
Amar, V. S., South Dakota School of Mines and Technology
Houck, J., South Dakota School of Mines and Technology
Mahadik, J., South Dakota School of Mines and Technology
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 1100oC and water-splitting temperature of 900-1100oC 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.