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13 results on '"Schröter, Erik"'

2. Development of Novel Redox‐Active Organic Materials Based on Benzimidazole, Benzoxazole, and Benzothiazole: A Combined Theoretical and Experimental Screening Approach.

Author

Fataj, Xhesilda, Achazi, Andreas J., Rohland, Philip, Schröter, Erik, Muench, Simon, Burges, René, Pohl, K. Linus H., Mollenhauer, Doreen, Hager, Martin D., and Schubert, Ulrich S.

Subjects
BENZOXAZOLES, ORGANIC bases, BENZOTHIAZOLE, BENZIMIDAZOLES, BENZOXAZOLE, LITHIUM-ion batteries, HEAVY metals
Abstract

Sustainability is one of the hot topics of today's research, in particular when it comes to energy‐storage systems such as batteries. Redox‐active molecules implemented in organic batteries represent a promising alternative to lithium‐ion batteries, which partially rely on non‐sustainable heavy metal salts. As an alternative, we propose benzothiazole, ‐oxazole and ‐imidazole derivatives as redox‐active moieties for polymers in organic (radical) batteries. The target molecules were identified by a combination of theoretical and experimental approaches for the investigation of new organic active materials. Herein, we present the synthesis, electrochemical characterization and theoretical investigation of the proposed molecules, which can later be introduced into a polymer backbone and used in organic polymer batteries. [ABSTRACT FROM AUTHOR]

Published
2024
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10. Towards Covalent Photosensitizer-Polyoxometalate Dyads-Bipyridyl-Functionalized Polyoxometalates and Their Transition Metal Complexes

Author

Winter, Andreas, Endres, Patrick, Schröter, Erik, Jäger, Michael, Görls, Helmar, Neumann, Christof, Turchanin, Andrey, and Schubert, Ulrich S.

Subjects
Photosensitizing Agents, Proton Magnetic Resonance Spectroscopy, Molecular Conformation, metal complexes, Tungsten Compounds, Article, 2,2'-Dipyridyl, Coordination Complexes, hybrid materials, Electrochemistry, polyoxometalates, Spectrophotometry, Ultraviolet, photocatalysis, Oxidation-Reduction, Density Functional Theory
Abstract

A triol-functionalized 2,2&prime, bipyridine (bpy) derivative has been synthesized and used for the tris-alkoxylation of polyoxometalate (POM) precursors. The resultant POM-bpy conjugates of the Wells&ndash, Dawson- and Anderson-type feature a C&ndash, C bond as a linkage between the POM and bpy fragments. This structural motif is expected to increase the hydrolytic stability of the compounds. This is of particular relevance with respect to the application of POM-bpy metal complexes, as photocatalysts, in the hydrogen-evolution reaction (HER) in an aqueous environment. Accordingly, Rh(III) and Ir(III) complexes of the POM-bpy ligands have been prepared and characterized. These catalyst-photosensitizer dyads have been analyzed with respect to their electrochemical and photophysical properties. Cyclic and square-wave voltammetry, as well as UV/vis absorption and emission spectroscopy, indicated a negligible electronic interaction of the POM and metal-complex subunits in the ground state. However, emission&ndash, quenching experiments suggested an efficient intramolecular electron-transfer process from the photo-excited metal centers to the POM units to account for the non-emissive nature of the dyads (thus, suggesting a strong interaction of the subunits in the excited state). In-depth photophysical investigations, as well as a functional characterization, i.e., the applicability in the HER reaction, are currently ongoing.

Published
2019

12. Flexible Hydrogel Electrolytes for Organic Batteries with High Cyclability

Author

Elbinger, Lada, Schröter, Erik, Zimmer, Philip, Friebe, Christian, Osenberg, Markus, Manke, Ingo, and Schubert, Ulrich S.

Abstract

The growing interest in organic batteries for the sustainable storage of energy is giving rise not only to new polymeric active materials for batteries but also to new electrolyte systems. Water-based electrolytes are particularly interesting due to the sheer abundance of water on our planet and its cost-effective, sustainable, nonhazardous, and nonflammable nature. To further increase the safety of aqueous battery cells, various strategies have been pursued, of which the use of solid and gel electrolytes is one of the most prominent. Here, we present an efficient approach for a new environmentally friendly hydrogel electrolyte with high ionic conductivity (20 ± 1 mS cm–1at room temperature) and medium ionic conductivity at low temperature (5.3 ± 0.3 mS cm–1at −20 °C) based on commercially available monomers and a zinc salt compatible with the redox chemistry of the 2,2,6,6-tetramethylpiperidine-N-oxyl radical in a semiorganic battery setup. We investigate its battery cycling behavior and compare its performance with that of a previously analyzed analog that does not contain a hydrogel.

Published
2024
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13. Development of Novel Redox-Active Organic Materials Based on Benzimidazole, Benzoxazole, and Benzothiazole: A Combined Theoretical and Experimental Screening Approach.

Author

Fataj X, Achazi AJ, Rohland P, Schröter E, Muench S, Burges R, Pohl KLH, Mollenhauer D, Hager MD, and Schubert US

Abstract

Sustainability is one of the hot topics of today's research, in particular when it comes to energy-storage systems such as batteries. Redox-active molecules implemented in organic batteries represent a promising alternative to lithium-ion batteries, which partially rely on non-sustainable heavy metal salts. As an alternative, we propose benzothiazole, -oxazole and -imidazole derivatives as redox-active moieties for polymers in organic (radical) batteries. The target molecules were identified by a combination of theoretical and experimental approaches for the investigation of new organic active materials. Herein, we present the synthesis, electrochemical characterization and theoretical investigation of the proposed molecules, which can later be introduced into a polymer backbone and used in organic polymer batteries., (© 2023 The Authors. Chemistry - A European Journal published by Wiley-VCH GmbH.)

Published
2024
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