Multiscale-Tailored Bioelectrode Surfaces for Optimized Catalytic Conversion Efficiency

作者：Saint Come Yemima Bon; Lalo Helene; Wang Zhijie; Etienne Mathieu; Gajdzik Janine; Kohring Gert Wieland; Walcarius Alain; Hempelmann Rolf; Kuhn Alexander^*

来源：Langmuir, 2011, 27(20): 12737-12744.

DOI：10.1021/la201930m

We describe the elaboration of a multiscale-tailored bioelectrocatalytic system. The combination of two enzymes, D-sorbitol dehydrogenase and diaphorase, is studied with respect to the oxidation of D-sorbitol as a model system. The biomolecules are immobilized in an electrodeposited paint (EDP) layer. Reproducible and efficient catalysis of D-sorbitol oxidation is recorded when this system is immobilized on a gold electrode modified by a self-assembled monolayer of 4-carboxy-(2,5,7-trinitro-9-fluorenylidene)malonitrile used as a mediator. The insertion of mediator-modified gold nanoparticles into the EDP film increases significantly the active surface area for the catalytic reaction, which can be further enhanced when the whole system is immobilized in macroporous gold electrodes. This multiscale architecture finally leads to a catalytic device with optimized efficiency for potential use in biosensors, bioelectrosynthesis, and biofuel cells.

• 出版日期2011-10-18