| About this Abstract |
| Meeting |
MS&T21: Materials Science & Technology
|
| Symposium
|
Grain Boundaries, Interfaces, and Surfaces in Ceramics: Fundamental Structure—Property—Performance Relationships
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| Presentation Title |
Triggering the Catalytic Activity of SrTiO3-based Ceramics by Electric-field-assisted Treatments |
| Author(s) |
Simone Mascotto |
| On-Site Speaker (Planned) |
Simone Mascotto |
| Abstract Scope |
The exposure of ceramic materials to electric fields during high temperature treatments has revealed to be an interesting approach to tune their densification and manipulate their grain boundary structure. Recently, this method was also used to modify the surface states of ceramics and influence their wetting properties. In the present work, we show how chemically inert SrTiO3 and donor-doped SrTiO3 ceramics can be turned into catalytically active materials by improving the concentration and reactivity of surface oxygen defects using electric-field-assisted treatments. The consolidation of perovskite oxides in presence of an electric field arrested the grain growth, retained the specific surface area and enhanced the concentration of Sr vacancies and O─ species. The dramatic change of the materials’ defect structure significantly improved their surface reactivity. Field-treated ceramics exhibited more than 95% of methane conversion at 800 °C, with performance over 3 times higher than conventionally treated systems and other donor-doped perovskites. |