Journal
BIOELECTROCHEMISTRY
Volume 120, Issue -, Pages 157-165Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.bioelechem.2017.12.006
Keywords
Surface functionalization; Diazopyridinium; Electrochemical grafting; Biofilm; Microbial fuel cells
Funding
- French Ministry of Research
- EU Marie Sklodowska Curie Individual Fellowship action
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Carbon electrodes were functionalized through the reduction of diazopyridinium cations that are produced from in situ diazotization of 2-, 3- and 4-aminopyridine. Diazopyridinium salts were much more rarely employed for surface functionalization than other aryldiazonium derivatives. A study combining X-ray Photoelectron Spectroscopy (XPS), contact angle, ellipsometry, Atomic Force Microscopy (AFM) measurements and electrochemical analyses demonstrates that films obtained from 4-diazopyridinium cations are hydrophilic, dense, compact but sufficiently thin to preserve fast electronic transfer rate, being then relevant to efficiently tailor the interface between the anode surface and an electroactive biofilm. Microbial Fuels Cells (MFCs) with pyridine-functionalized graphite anodes exhibit faster development and improved performances than MFCs operating with bare graphite anodes. (C) 2017 Elsevier B.V. All rights reserved.
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