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24 results on '"Rodewald, Katia"'

7. 3D-Printed Metal–Organic Framework-Derived Composites for Enhanced Photocatalytic Hydrogen Generation

Author

Hussain, M.Z. (author), Großmann, Paula F. (author), Kohler, Fabian (author), Kratky, Tim (author), Kronthaler, Laura (author), van der Linden, B. (author), Rodewald, Katia (author), Rieger, Bernhard (author), Fischer, Roland A. (author), Xia, Yongde (author), Hussain, M.Z. (author), Großmann, Paula F. (author), Kohler, Fabian (author), Kratky, Tim (author), Kronthaler, Laura (author), van der Linden, B. (author), Rodewald, Katia (author), Rieger, Bernhard (author), Fischer, Roland A. (author), and Xia, Yongde (author)

Abstract

Direct ink writing technique is used to 3D print Ti-metal–organic framework (MOF) NH2-MIL-125 mixed with boehmite dispersal. Pt is also deposited onto 3D-printed monolith using atomic layer deposition (ALD) to offer additional catalytic sites. The Ti-MOF-derived powder sample and the pyrolyzed 3D-printed monolith samples are evaluated for photocatalytic H2 evolution under UV–vis light. As a proof of concept, herein, it is demonstrated that 3D-printed MOF-derived monolith photocatalysts show five times higher H2 evolution performance compared with TiO2/C powder sample due to better interaction between 3D-printed photocatalysts and the incident light. The high surface area, the formation of hierarchical macro- to nanopores, and the optimizable shape/size of the 3D-printed catalyst maximize the exposure of catalytic active sites to incident photons and increase their photocatalytic H2 evolution performance. In addition, the N-functionalized porous carbon from organic linker, and the uniformly distributed Pt/PtOx species deposited by ALD, provide cocatalytic active sites for photocatalytic reaction and further enhance photocatalytic activity 30% of 3D-printed monoliths. This work on the 3D-printed MOF-derived free-standing monoliths for photocatalytic application provides a readily available approach to further fabricate a variety of 3D-printed MOF-based and derived materials for different energy and environment applications., ChemE/O&O groep

Published
2022
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8. Defect engineering in MIL-125-(Ti)-NH2 for enhanced photocatalytic H2 generation.

Author

Pukdeejorhor, Ladawan, Wannapaiboon, Suttipong, Berger, Jan, Rodewald, Katia, Thongratkaew, Sutarat, Impeng, Sarawoot, Warnan, Julien, Bureekaew, Sareeya, and Fischer, Roland A.

Abstract

Pre-designing starting materials is a sensible approach to tailor the synthetic, optoelectronic, and physicochemical properties of a photocatalyst towards higher activity without the need for additional active species. MIL-125-(Ti)-NH2, a metal–organic framework (MOF) photocatalytically active for H2 evolution, was first successfully synthesised at a relatively low temperature of 70 °C upon employing pre-designed titanium-oxo-carboxylate clusters. While rearrangement of the original cluster enabled successful MIL-125-(Ti)-NH2 formation, its ligand stoichiometry favoured MOFs with abundant "defects" at the Ti centres which in turn acted as accessible active sites for H2 generation. The catalytic sites and their local geometry were studied by pyridine-adsorbed Fourier transform infrared spectroscopy, X-ray absorption near-edge structure, and extended X-ray absorption fine structure. Interestingly, the frameworks prepared using pre-designed titanium-oxo clusters can alter electronic optical properties and energy levels. In the presence of triethanolamine as an electron donor and under visible light irradiation, this led to a ∼3.5 times higher H2 evolution rate in the titanium-oxo cluster MOF compared to MIL-125-(Ti)-NH2 obtained by typical hydrothermal synthesis. The obtained catalyst also exhibits a good-reusable performance for at least three consecutive runs without any loss in its reactivity. Pre-designed clusters can be simply utilised to generate accessible active sites and manipulate electrical properties for enhancing catalytic performance. [ABSTRACT FROM AUTHOR]

Published
2023
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12. Porphyrin based metal–organic framework films: nucleation and growth

Author

Zhou, Zhenyu, primary, Mukherjee, Soumya, additional, Warnan, Julien, additional, Li, Weijin, additional, Wannapaiboon, Suttipong, additional, Hou, Shujin, additional, Rodewald, Katia, additional, Rieger, Bernhard, additional, Weidler, Peter G., additional, Wöll, Christof, additional, and Fischer, Roland A., additional

Published
2020
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20. Superhydrophobic Silicon Nanocrystal–Silica Aerogel Hybrid Materials: Synthesis, Properties, and Sensing Application

Author

Kehrle, Julian, primary, Purkait, Tapas K., additional, Kaiser, Simon, additional, Raftopoulos, Konstantinos N., additional, Winnacker, Malte, additional, Ludwig, Theresa, additional, Aghajamali, Maryam, additional, Hanzlik, Marianne, additional, Rodewald, Katia, additional, Helbich, Tobias, additional, Papadakis, Christine M., additional, Veinot, Jonathan G. C., additional, and Rieger, Bernhard, additional

Published
2018
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