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Gewählte Publikation:

Pinyou, P; Ruff, A; Poller, S; Ma, S; Ludwig, R; Schuhmann, W.
(2016): Design of an Os Complex-Modified Hydrogel with Optimized Redox Potential for Biosensors and Biofuel Cells
CHEM-EUR J. 2016; 22(15): 5319-5326. FullText FullText_BOKU

Multistep synthesis and electrochemical characterization of an Os complex-modified redox hydrogel exhibiting a redox potential approximate to+30mV (vs. Ag/AgCl 3m KCl) is demonstrated. The careful selection of bipyridine-based ligands bearing N,N-dimethylamino moieties and an amino-linker for the covalent attachment to the polymer backbone ensures the formation of a stable redox polymer with an envisaged redox potential close to 0V. Most importantly, the formation of an octahedral N6-coordination sphere around the Os central atoms provides improved stability concomitantly with the low formal potential, a low reorganization energy during the Os3+/2+ redox conversion and a negligible impact on oxygen reduction. By wiring a variety of enzymes such as pyrroloquinoline quinone (PQQ)-dependent glucose dehydrogenase, flavin adenine dinucleotide (FAD)-dependent glucose dehydrogenase and the FAD-dependent dehydrogenase domain of cellobiose dehydrogenase, low-potential glucose biosensors could be obtained with negligible co-oxidation of common interfering compounds such as uric acid or ascorbic acid. In combination with a bilirubin oxidase-based biocathode, enzymatic biofuel cells with open-circuit voltages of up to 0.54V were obtained.
Autor/innen der BOKU Wien:
Ludwig Roland
Ma Su
BOKU Gendermonitor:

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redox chemistry

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