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Functionalization of Contacted Carbon Nanotube Forests by Dip Coating for High‐Performance Biocathodes

Abstract : This work focuses on the use of electrically contacted carbon nanotubes forests as an electrode material for the bioelectrocatalytic reduction of oxygen to water. The forests are directly grown by Chemical Vapor deposition on a conductive tantalum layer which provide enough mechanic stability during several functionalization and enzyme immobilization steps. A pyrene bis-anthraquinone derivative (Pyr-(AQ) 2) was attached via π-stacking throughout the forest and was used as anchor molecule for oriented immobilization of laccase. This led to highperformance biocathodes for oxygen reduction via direct electron transfer with maximum current densities up to 0.84 mA cm-2 at 0.2 V vs Ag/AgCl. The morphological changes during the wet chemical processes were studied by Scanning Electron Microscopy (SEM) revealing cellular 2 patterning of the forest structure. Despite these changes, the forest remained attached and electrically connected to the tantalum layer. The resulting bioelectrodes performed with satisfying stabilities under constant discharge conditions and kept 75 % of its initial performances after one week.
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Submitted on : Monday, August 22, 2022 - 5:00:42 PM
Last modification on : Thursday, August 25, 2022 - 3:04:40 AM


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Meenakshi Singh, Hugo Nolan, Maryam Tabrizian, Serge Cosnier, Georg Düsberg, et al.. Functionalization of Contacted Carbon Nanotube Forests by Dip Coating for High‐Performance Biocathodes. ChemElectroChem, Weinheim : Wiley-VCH, 2020, 7 (22), pp.4685-4689. ⟨10.1002/celc.202001334⟩. ⟨hal-03757995⟩



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