Visualisation of the local bio-electrocatalytic activity in biofuel cell cathodes by means of redox competition scanning electrochemical microscopy (RC-SECM)
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- 作者：Katarzyna Karnicka ; Kathrin Eckhard ; Dmitrii A. Guschin ; Leonard Stoica ; Pawel J. Kulesza ; Wolfgang Schuhmann
- 关键词：Bilirubin oxidase ; Biofuel cell ; Electrodeposition paint ; Redox polymers ; Oxygen reduction ; SECM ; RC-SECM ; Redox competition
- 刊名：Electrochemistry Communications
- 出版年：2007
- 出版时间：August 2007
- 年：2007
- 卷：9
- 期：8
- 页码：1998-2002
- 全文大小：185 K
文摘
Optimisation of biocatalytic systems for the electroreduction of molecular O2 in biofuel cell cathodes implies screening of the catalytic activity of enzyme/redoxpolymer assemblies. Os-complex modified electrodeposition polymers are suggested for linking bilirubin oxidase catalysed O2 reduction via an electron hopping sequence along the redox polymer to the electrode. They can be non-manually precipitated on electrode surfaces by electrochemically induced pH modulation. Cyclic voltammetry provides a good estimation of the electrocatalytic activity of a redox polymer/enzyme modified electrode surface. In addition, scanning electrochemical microscopy operating in redox competition mode (RC-SECM) supplies images of the spatial distribution of the biocatalytic activity.