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Relationship between surface chemistry, biofilm structure, and electron transfer in Shewanella anodes

Schuler, Andrew J.; Atanassov, Plamen; Babanova, Sofia; Ista, Linnea K.; Cornejo, Jose A.; Artyushkova, Kateryna; Santoro, Carlo

Authors

Andrew J. Schuler

Plamen Atanassov

Sofia Babanova

Linnea K. Ista

Jose A. Cornejo

Kateryna Artyushkova

Carlo Santoro Carlo.Santoro@uwe.ac.uk
Associate Professor in Bio-Energy



Abstract

© 2015 American Vacuum Society. A better understanding of how anode surface properties affect growth, development, and activity of electrogenic biofilms has great potential to improve the performance of bioelectrochemical systems such as microbial fuel cells. The aim of this paper was to determine how anodes with specific exposed functional groups (-N(CH3)3+, -COOH, -OH, and -CH3), created using ω-substituted alkanethiolates self-assembled monolayers attached to gold, affect the surface properties and functional performance of electrogenic Shewanella oneidensis MR-1 biofilms. A combination of spectroscopic, microscopic, and electrochemical techniques was used to evaluate how electrode surface chemistry influences morphological, chemical, and functional properties of S. oneidensis MR-1 biofilms, in an effort to develop improved electrode materials and structures. Positively charged, highly functionalized, hydrophilic surfaces were beneficial for growth of uniform biofilms with the smallest cluster sizes and intercluster diffusion distances, and yielding the most efficient electron transfer. The authors derived these parameters based on 3D morphological features of biofilms that were directly linked to functional properties of the biofilm during growth and that, during polarization, were directly connected to the efficiency of electron transfer to the anode. Our results indicate that substratum chemistry affects not only primary attachment, but subsequent biofilm development and bacterial physiology.

Citation

Schuler, A. J., Atanassov, P., Babanova, S., Ista, L. K., Cornejo, J. A., Artyushkova, K., & Santoro, C. (2015). Relationship between surface chemistry, biofilm structure, and electron transfer in Shewanella anodes. Biointerphases, 10(1), https://doi.org/10.1116/1.4913783

Journal Article Type Article
Acceptance Date Feb 18, 2015
Publication Date Mar 1, 2015
Deposit Date May 1, 2018
Journal Biointerphases
Print ISSN 1934-8630
Electronic ISSN 1559-4106
Publisher AIP Publishing
Peer Reviewed Peer Reviewed
Volume 10
Issue 1
DOI https://doi.org/10.1116/1.4913783
Keywords electrogenic biofilmsl bioelectrochemical, microbial fuel cells
Public URL https://uwe-repository.worktribe.com/output/837425
Publisher URL http://dx.doi.org/10.1116/1.4913783