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2022 (English)Conference paper, Poster (with or without abstract) (Other academic)
Abstract [en]
Efficient molecular electrocatalysts are a vital part of the ongoing transition towards sustainable fuel production and away from expensive traditional noble metal catalysts. Molecular catalysts can be synthesized from earth-abundant elements and have well-defined catalytic sites [1], but are associated with poor electronic connection and impractical product separation in homogeneous setups [1-2].
We have synthesized and characterized a conducting redox polymer [3–4] consisting of a conjugated EDOT-based polymer functionalized with free base porphyrins. The polymer allows for simple surface immobilization, a higher number of catalytic units than a monolayer, and continuous charge transport to and from the redox centers of the porphyrins over a large potential window. The porphyrins are aromatic macrocyclic ligands with a rich redox chemistry that can be metallated with a wide variety of metals. Through substitution and metalation, the catalytic selectivity of these redox non-innocent compounds can be tuned towards environmentally beneficial redox reactions, such as solar-powered hydrogen evolution or CO2 reduction.
Through electrochemical analysis, we have established that the individual properties of the system building-blocks are preserved, that the polymer improves porphyrin reaction kinetics, that the porphyrins are efficient conduits for electron transfer, and that the porphyrin pendant units can be metallated before or after polymerization. The system should thus be regarded as a stable fundamental platform that through appropriate molecular fine-tuning can be can be used for heterogeneous catalysis of environmentally beneficial redox reactions.
References
[1] A. Corma, H. Garcia, Top. Catal. 48 (2008) 8.
[2] W. Herrmann, C. Kohlpaintner, Angew. Chem. Int. Ed. Engl. 32 (1993) 1524.
[3] M. Sterby, R. Emanuelsson, F. Mamedov, M. Strømme, M. Sjödin, Electrochim. Acta. 308 (2019) 277.
[4] G. Zotti, A. Berlin, G. Pagani, G. Schiavon, S. Zecchin, Adv. Mater. 7 (1995) 48.
National Category
Nano Technology
Research subject
Engineering Science with specialization in Nanotechnology and Functional Materials
Identifiers
urn:nbn:se:uu:diva-489440 (URN)
Conference
The 19th International Symposium on Novel Aromatic Compounds, Warsaw, July 3-8 2022.
2022-11-302022-11-302022-12-02Bibliographically approved