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

Title data

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

Abstract in another language

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.

Further data

Item Type: Conference item (Poster)
Refereed: Yes
Institutions of the University: Faculties > Faculty of Engineering Science
Faculties > Faculty of Engineering Science > Chair Functional Materials > Chair Functional Materials - Univ.-Prof. Dr.-Ing. Ralf Moos
Profile Fields > Advanced Fields > Advanced Materials
Research Institutions > Research Centres > Bayreuth Center for Material Science and Engineering - BayMAT
Faculties
Faculties > Faculty of Engineering Science > Chair Functional Materials
Profile Fields
Profile Fields > Advanced Fields
Research Institutions
Research Institutions > Research Centres
Result of work at the UBT: Yes
DDC Subjects: 600 Technology, medicine, applied sciences > 620 Engineering
Date Deposited: 03 Apr 2017 08:06
Last Modified: 03 Apr 2017 08:06
URI: https://eref.uni-bayreuth.de/id/eprint/36734