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Improving the Direct Electron Transfer Efficiency in Laccase Electrodes for Biofuel Cell Cathodic Reactions

AuthorsPita, Marcos ; Gutiérrez Sánchez, Cristina ; López de Lacey, Antonio
Issue DateSep-2012
Citation13th Trends in Nanotechnology International Conference (2012)
AbstractFungal laccases are one of the best candidates for enzymatic biofuel cell cathodes due to its ability to reduce O2 directly to H2 O at high potentials; laccases are also suitable for direct electron transfer when appropriately wired toward different electroactive surfaces such as gold or graphite. However, laccase faces several hindering conditions when taking to many in vivo-like environments, being the most relevant chloride inhibition and the functional pH. Chloride anions are a reversible inhibitor of laccase and are present in most biological fluids. Additionally, the typically acidic pH-optima for laccase performance take any laccase-modified electrode out of range for many natural fluids. This presentation will show strategies to improve laccase performance under these nonfavoured environments. It has been shown that specific orientation of laccase for DET can reduce this inhibition source when immobilized on a low-density graphite (LDG) electrode1 and how to extend this immobilization method to gold planar electrodes2 . We will show the improvement brought to current density and chloride resistance by combining a LDG electrode with gold nanoparticles. The limitations brought by the use of neutral pH can be addressed by generation of a local acidic pH environment. This has been achieved by inserting the laccase electrode in a magnetic ring that allows the deposition of magnetic nanoparticles carrying another enzyme able to acidify the environment.3 For conceptual purposes we have used glucose oxidase (GOx) to produce a gluconic-acid environment, managing to lower pH 2 units while keeping the bulk pH neutral and therefore allowing laccase to work. Catalase was present for oxygen-regeneration purposes.
DescriptionTrabajo presentado en la 13th edition of Trends in Nanotechnology International Conference (TNT2012), celebrada en Madrid del 10 al 14 de septiembre de 2012.
Appears in Collections:(ICP) Comunicaciones congresos
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