Laccase-​modified gold nanorods for electrocatalytic reduction of oxygen

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Laccase-​modified gold nanorods for electrocatalytic reduction of oxygen

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Publication Article, peer reviewed scientific
Title Laccase-​modified gold nanorods for electrocatalytic reduction of oxygen
Author Di Bari, Chiara ; Shleev, Sergey ; De Lacey, Antonio ; Pita, Marcos
Date 2016
English abstract
The multicopper oxidase Trametes hirsuta laccase (ThLc) served as a bioelectrocatalyst on nanostructured cathodes. Nanostructuring was provided by gold nanorods (AuNRs)​, which were characterized and covalently attached to electrodes made of low-​d. graphite. The nanostructured electrode was the scaffold for covalent and oriented attachment of ThLc. The bioelectrocatalytic currents measured for oxygen redn. were as high as 0.5 mA​/cm2 and 0.7 mA​/cm2, which were recorded under direct and mediated electron transfer regimes, resp. The exptl. data were fitted to math. models showing that when the O2 is bioelectroreduced at high rotation speed of the electrode the heterogeneous electron transfer step is the rate-​liming stage. The electrochem. measurement hints a wider population of non-​optimally wired laccases than previously reported for 5-​8 nm size Au nanoparticle-​modified electrode, which could be due to a larger size of the AuNRs when compared to the laccases as well as their different crystal facets.
DOI https://doi.org/10.1016/j.bioelechem.2015.10.003 (link to publisher's fulltext.)
Publisher Elsevier
Host/Issue Bioelectrochemistry;
Volume 107
ISSN 1567-5394
Pages 30-36
Language eng (iso)
Subject Sciences
Research Subject Categories::NATURAL SCIENCES
Handle http://hdl.handle.net/2043/21931 Permalink to this page
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