Cobaloxime Complex Salts: Synthesis, Patterning on Carbon Nanomembranes and Heterogeneous Hydrogen Evolution Studies

Oswald E, Gaus AL, Kund J, Küllmer M, Romer J, Weizenegger S, Ullrich T, Mengele AK, Petermann L, Leiter R, Unwin PR, Kaiser U, Rau S, Kahnt A, Turchanin A, von Delius M, Kranz C (2021)

Publication Type: Journal article

Publication year: 2021

Journal

Chemistry - A European Journal Wiley

DOI: 10.1002/chem.202102778

Abstract

Cobaloximes are promising, earth-abundant catalysts for the light-driven hydrogen evolution reaction (HER). Typically, these cobalt(III) complexes are prepared in situ or employed in their neutral form, for example, [Co(dmgH)2(py)Cl], even though related complex salts have been reported previously and could, in principle, offer improved catalytic activity as well as more efficient immobilization on solid support. Herein, we report an interdisciplinary investigation into complex salts [Co(dmgH)2(py)2]+[Co(dmgBPh2)2Cl2]−, (Formula presented.) and [Co(dmgH)2(py)2]+BArF−. We describe their strategic syntheses from the commercially available complex [Co(dmgH)2(py)Cl] and demonstrate that these double and single complex salts are potent catalysts for the light-driven HER. We also show that scanning electrochemical cell microscopy can be used to deposit arrays of catalysts [Co(dmgH)2(py)2]+[Co(dmgBPh2)2Cl2]−, (Formula presented.) and [Co(dmgH)2(py)Cl] on supported and free-standing amino-terminated ∼1-nm-thick carbon nanomembranes (CNMs). Photocatalytic H2 evolution at such arrays was quantified with Pd microsensors by scanning electrochemical microscopy, thus providing a new approach for catalytic evaluation and opening up novel routes for the creation and analysis of “designer catalyst arrays”, nanoprinted in a desired pattern on a solid support.

Authors with CRIS profile

Tobias Ullrich Lehrstuhl für Physikalische Chemie I

Involved external institutions

Institut für Analytische und Bioanalytische Chemie DE Germany (DE) Universität Ulm DE Germany (DE) Friedrich-Schiller-Universität Jena DE Germany (DE) University of Warwick GB United Kingdom (GB) Leibniz-Institute für Oberflächenmodifizierung e. V. (IOM) / Leibniz Institute of Surface Modification DE Germany (DE)

How to cite

APA:

Oswald, E., Gaus, A.L., Kund, J., Küllmer, M., Romer, J., Weizenegger, S.,... Kranz, C. (2021). Cobaloxime Complex Salts: Synthesis, Patterning on Carbon Nanomembranes and Heterogeneous Hydrogen Evolution Studies. Chemistry - A European Journal. https://doi.org/10.1002/chem.202102778

MLA:

Oswald, Eva, et al. "Cobaloxime Complex Salts: Synthesis, Patterning on Carbon Nanomembranes and Heterogeneous Hydrogen Evolution Studies." Chemistry - A European Journal (2021).

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