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Gas diffusion biocathode for oxygen reduction based on direct electron transfer between carbon nanotubes and laccase

Titelangaben

Hämmerle, Martin ; Hilgert, Karin ; Moos, Ralf:
Gas diffusion biocathode for oxygen reduction based on direct electron transfer between carbon nanotubes and laccase.
2017
Veranstaltung: 1st European & 10th German BioSensor Symposium , 20.3.-23.3.2017 , Potsdam.
(Veranstaltungsbeitrag: Kongress/Konferenz/Symposium/Tagung , Poster )

Abstract

Enzymatic fuel cells found increased interest in recent years. In comparison to other fuel cells neither precious metal catalysts nor expensive membranes are needed, and they can be operated at room temperature. However, various issues such as limited stability or current density have to be addressed in order to improve their performance. For the oxygen reduction reaction at the biocathode based on multicopper oxidases such as bilirubin oxidase or laccase, gas diffusion electrodes have been proposed in order to avoid solubility and diffusion limitations of oxygen. In this context, we present the design of a gas diffusion biocathode based on laccase from Trametes versicolor. The enzyme is adsorbed on polymer (e.g. PEG 3000) modified multi-walled carbon nanotubes enabling a direct electron transfer from the enzyme to the electrode. The onset potential of the catalytic current starts at approx. 0.65 V vs. Ag/AgCl. The current density under potentiostatic control is approx. 50 μA/cm2 @ 0.4 V vs. Ag/AgCl in pure oxygen atmosphere. The response time is quite fast, reaching a steady state within a few seconds. Further results will be presented addressing the characteristics of the biocathode as well as modifications of its design.

Weitere Angaben

Publikationsform: Veranstaltungsbeitrag (Poster)
Begutachteter Beitrag: Ja
Institutionen der Universität: Fakultäten > Fakultät für Ingenieurwissenschaften
Fakultäten > Fakultät für Ingenieurwissenschaften > Lehrstuhl Funktionsmaterialien > Lehrstuhl Funktionsmaterialien - Univ.-Prof. Dr.-Ing. Ralf Moos
Profilfelder > Advanced Fields > Neue Materialien
Forschungseinrichtungen > Forschungszentren > Bayreuther Materialzentrum - BayMAT
Fakultäten
Fakultäten > Fakultät für Ingenieurwissenschaften > Lehrstuhl Funktionsmaterialien
Profilfelder
Profilfelder > Advanced Fields
Forschungseinrichtungen
Forschungseinrichtungen > Forschungszentren
Titel an der UBT entstanden: Ja
Themengebiete aus DDC: 600 Technik, Medizin, angewandte Wissenschaften > 620 Ingenieurwissenschaften
Eingestellt am: 03 Apr 2017 08:06
Letzte Änderung: 03 Apr 2017 08:06
URI: https://eref.uni-bayreuth.de/id/eprint/36734