Berlin 2024 – wissenschaftliches Programm

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 9: KFM Poster Session

KFM 9.2: Poster

Montag, 18. März 2024, 18:00–20:00, Poster E

High Active Labile Oxygen Due to Special Lattice Oxygen Structure — •Linfeng Su¹, Xu Chen², Huaping Zhao¹, Zhiyi Lu², and Yong Lei¹ — ¹Fachgebiet Angewandte Nanophysik, Institut für Physik & IMN MacroNano, Technische Universität Ilmenau, 98693 Ilmenau, Germany — ²Key Laboratory of Advanced Fuel Cells and Electrolyzers Technology of Zhejiang Province, Ningbo Institute of Materials Technology and Engineering, CAS, Ningbo, Zhejiang, 315201, PR China

The difference between such active lattice oxygens and inactive lattice oxygens has not been thoroughly investigated. A unique oxygen structure was successfully synthesized at low temperatures, which is similar to the lattice oxygen structure but with higher activity. With the various characterize methods, the unique oxygen structure was determined as labile oxygen, which distinguishes it from ordinary lattice oxygen. As shown in the characterization of our research, the bridging oxygen between AlO4 and other structures is identified as labile oxygen with relatively high activity. The activity of labile oxygen was proved by catalytic ozonation, which showed excellent performance with a high quasi-first order rate constant. Operando Raman and DFT simulations further proved that Olab acted as the catalytic active center, which activates ozone via an unusual surface peroxide pathway to generate surface high-oxidative Olab-O* species. The research on the unique oxygen structure of silicate-aluminate provides theoretical guidance for the design and synthesis of catalysts with high catalytic activities for future industrial applications.

Keywords: Labile oxygen; Oxygen defects; high active; Surface peroxide