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RevistaJournal of Physical Chemistry C

High Redox Potential Cathode Based on Laccase Covalently Attached to Gold Electrode

Autores:Marcos Pita Martínez, María Cristina Gutiérrez Sánchez, David Olea Duplan, Marisela Vélez Tirado, Cristina García Diego, Sergey Shleev , Víctor Manuel Fernández López, Antonio López de Lacey
Grupos de investigación:BioElectroCatalisis
A new strategy for oriented covalent immobilization of Trametes hirsuta laccase on gold electrodes is presented. The strategy is based on the gold surface modification with a mixed monolayer of an aromatic diazonium salt derivative and 6-mercapto-1-hexanol for further use as scaffold for the enzyme’s covalent linkage. This strategy offers a variety of advantages such as high stability and laccase-friendly support morphology, which turns it into a suitable metalenzyme interface. Conditions aiming at optimum orientation for direct electron transfer (DET) via the T1 copper site were studied. Current density values up to 40 μA 3 cm2 were measured for the electrocatalytic reduction of O2 in the absence of redox mediators. This strategy is a big step forward in the development of laccase modified gold electrodes for bioelectrocatalytic reduction of O2.
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