About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
Ceramics for Clean Hydrogen
|
| Presentation Title |
Advancing Solar Hydrogen Production by Thermochemical Redox Cycling of Nonstoichiometric Alkaline-Earth Manganese Perovskites |
| Author(s) |
Xin Qian, Hohan Bae, Danielle Veigel, Alireza Shirazi-amin, John Pietras, Sossina M. Haile |
| On-Site Speaker (Planned) |
Xin Qian |
| Abstract Scope |
Alkaline-earth manganese-based perovskites are promising alternatives to state-of-the-art fluorite CeO2-δ for solar hydrogen production via thermochemical redox cycling. Prior studies of SrTi0.5Mn0.5O3-δ (STM5050) and CaTi0.5Mn0.5O3-δ (CTM5050) revealed attractive properties, including excellent stability (up to 1500 °C under pO2 = 10-5 atm) and unprecedented combination of hydrogen productivity (10 mL g-1) and hydrogen production rate (111 µL min-1 g-1) with a thermal reduction temperature of just 1350 °C. The gas evolution processes were moreover found to be largely limited by thermodynamic rather than material kinetic constraints. Here, a comprehensive evaluation of the SrTixMn1-xO3-δ (x = 0 – 0.8) system reveals systematic changes in crystal structure and thermodynamic properties with increasing Ti content, and hence systematic changes in water splitting efficacy. Similar studies are under way with the CaTixMn1-xO3-δ (x = 0.4 – 0.7) system, in which the impact of material microstructure engineering on fuel production profiles is also being evaluated. |