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

AuthorsPita, Marcos ; Gutiérrez Sánchez, Cristina ; Olea, David ; Vélez, Marisela ; García Diego, Cristina ; Shleev, Sergey; Fernández López, Víctor Manuel ; López de Lacey, Antonio
Diazonium salt
Direct electron transfer
Issue Date17-Jun-2011
PublisherAmerican Chemical Society
CitationJournal of Physical Chemistry C
AbstractA 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 metal-enzyme 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·cm-2 were measured for the electrocatalytic reduction of O2 in absence of redox mediators. This strategy is a big step forward in the development of laccase-modified gold electrodes for bioelectrocatalytic reduction of O2.
Publisher version (URL)http://doi.org/10.1021/jp203643h
Appears in Collections:(ICP) Artículos
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