scholarly journals Graphite anode surface modification with controlled reduction of specific aryl diazonium salts for improved microbial fuel cells power output

2011 ◽  
Vol 28 (1) ◽  
pp. 181-188 ◽  
Author(s):  
Matthieu Picot ◽  
Laure Lapinsonnière ◽  
Michael Rothballer ◽  
Frédéric Barrière
Keyword(s):  
Surface Modification ◽  
Fuel Cells ◽  
Power Output ◽  
Microbial Fuel Cells ◽  
Graphite Anode ◽  
Anode Surface ◽  
Diazonium Salts

scholarly journals Enhancement of the Start-Up Time for Microliter-Scale Microbial Fuel Cells (µMFCs) via the Surface Modification of Gold Electrodes

Micromachines ◽  
2020 ◽  
Vol 11 (7) ◽  
pp. 703
Author(s):  
Begüm Şen-Doğan ◽  
Meltem Okan ◽  
Nilüfer Afşar-Erkal ◽  
Ebru Özgür ◽  
Özge Zorlu ◽  
...  
Keyword(s):  
Surface Modification ◽  
Fuel Cells ◽  
Microbial Fuel Cells ◽  
Microelectromechanical Systems ◽  
Electrochemical Impedance ◽  
Shewanella Oneidensis ◽  
Bacterial Attachment ◽  
Anode Surface ◽  
Sem Images ◽  
Start Up

Microbial Fuel Cells (MFCs) are biological fuel cells based on the oxidation of fuels by electrogenic bacteria to generate an electric current in electrochemical cells. There are several methods that can be employed to improve their performance. In this study, the effects of gold surface modification with different thiol molecules were investigated for their implementation as anode electrodes in micro-scale MFCs (µMFCs). Several double-chamber µMFCs with 10.4 µL anode and cathode chambers were fabricated using silicon-microelectromechanical systems (MEMS) fabrication technology. µMFC systems assembled with modified gold anodes were operated under anaerobic conditions with the continuous feeding of anolyte and catholyte to compare the effect of different thiol molecules on the biofilm formation of Shewanella oneidensis MR-1. Performances were evaluated using polarization curves, Electrochemical Impedance Spectroscopy (EIS), and Scanning Electron Microcopy (SEM). The results showed that µMFCs modified with thiol self-assembled monolayers (SAMs) (cysteamine and 11-MUA) resulted in more than a 50% reduction in start-up times due to better bacterial attachment on the anode surface. Both 11-MUA and cysteamine modifications resulted in dense biofilms, as observed in SEM images. The power output was found to be similar in cysteamine-modified and bare gold µMFCs. The power and current densities obtained in this study were comparable to those reported in similar studies in the literature.

scholarly journals Lack of Electricity Production by Pelobacter carbinolicus Indicates that the Capacity for Fe(III) Oxide Reduction Does Not Necessarily Confer Electron Transfer Ability to Fuel Cell Anodes

2007 ◽  
Vol 73 (16) ◽  
pp. 5347-5353 ◽  
Author(s):  
Hanno Richter ◽  
Martin Lanthier ◽  
Kelly P. Nevin ◽  
Derek R. Lovley
Keyword(s):  
Electron Transfer ◽  
Fuel Cells ◽  
Fuel Cell ◽  
Microbial Fuel Cell ◽  
Microbial Fuel Cells ◽  
Electron Donors ◽  
Rrna Genes ◽  
Anode Surface ◽  
Oxide Reduction ◽  
Fuel Cell Anodes

ABSTRACT The ability of Pelobacter carbinolicus to oxidize electron donors with electron transfer to the anodes of microbial fuel cells was evaluated because microorganisms closely related to Pelobacter species are generally abundant on the anodes of microbial fuel cells harvesting electricity from aquatic sediments. P. carbinolicus could not produce current in a microbial fuel cell with electron donors which support Fe(III) oxide reduction by this organism. Current was produced using a coculture of P. carbinolicus and Geobacter sulfurreducens with ethanol as the fuel. Ethanol consumption was associated with the transitory accumulation of acetate and hydrogen. G. sulfurreducens alone could not metabolize ethanol, suggesting that P. carbinolicus grew in the fuel cell by converting ethanol to hydrogen and acetate, which G. sulfurreducens oxidized with electron transfer to the anode. Up to 83% of the electrons available in ethanol were recovered as electricity and in the metabolic intermediate acetate. Hydrogen consumption by G. sulfurreducens was important for ethanol metabolism by P. carbinolicus. Confocal microscopy and analysis of 16S rRNA genes revealed that half of the cells growing on the anode surface were P. carbinolicus, but there was a nearly equal number of planktonic cells of P. carbinolicus. In contrast, G. sulfurreducens was primarily attached to the anode. P. carbinolicus represents the first Fe(III) oxide-reducing microorganism found to be unable to produce current in a microbial fuel cell, providing the first suggestion that the mechanisms for extracellular electron transfer to Fe(III) oxides and fuel cell anodes may be different.

Effect of Anode Surface Roughness on Power Generation in Microbial Fuel Cells

2012 ◽  
Author(s):  
Zhou Ye ◽  
Junbo Hou ◽  
Michael W. Ellis ◽  
Bahareh Behkam
Keyword(s):  
Surface Roughness ◽  
Fuel Cells ◽  
Glassy Carbon ◽  
Microbial Fuel Cells ◽  
Electrochemical Impedance ◽  
Charge Transfer Resistance ◽  
Electrode System ◽  
Anode Surface ◽  
Transfer Resistance ◽  
Rough Electrode

A three-electrode system was used to study the effect of anode surface roughness on the performance of microbial fuel cells (MFCs). Two glassy carbon plates were polished to uniform roughness of the orders of magnitude of 10s of nm and 100s of nm. Atomic force microscopy (AFM) was used to quantify the roughness as well as the 3D topography of the surfaces. Multiple electrochemical methods including potentiostatic tests, potentiodynamic tests, and electrochemical impedance spectroscopy (EIS) were utilized to monitor the performance of the glassy carbon electrodes. After 275 hours of experimentation, the current density generated by the rough electrode was much higher than that generated by the smooth one. Furthermore, the charge-transfer resistance of the rough electrode was lower than that of the smooth one. The better electrochemical performance of the rough surface may be due to denser biofilm grown on the surface, which was observed by scanning electron microscopy (SEM).

Integrating engineering design improvements with exoelectrogen enrichment process to increase power output from microbial fuel cells

2009 ◽  
Vol 191 (2) ◽  
pp. 520-527 ◽  
Author(s):  
Abhijeet P. Borole ◽  
Choo Y. Hamilton ◽  
Tatiana A. Vishnivetskaya ◽  
David Leak ◽  
Calin Andras ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Engineering Design ◽  
Power Output ◽  
Microbial Fuel Cells ◽  
Enrichment Process

Increased power output from micro porous layer (MPL) cathode microbial fuel cells (MFC)

2013 ◽  
Vol 38 (26) ◽  
pp. 11552-11558 ◽  
Author(s):  
G. Papaharalabos ◽  
J. Greenman ◽  
C. Melhuish ◽  
C. Santoro ◽  
P. Cristiani ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Porous Layer ◽  
Power Output ◽  
Microbial Fuel Cells

Surface modification of commercial carbon felt used as anode for Microbial Fuel Cells

Energy ◽  
2016 ◽  
Vol 99 ◽  
pp. 193-201 ◽  
Author(s):  
Diana Hidalgo ◽  
Tonia Tommasi ◽  
Sergio Bocchini ◽  
Alessandro Chiolerio ◽  
Angelica Chiodoni ◽  
...  
Keyword(s):  
Surface Modification ◽  
Fuel Cells ◽  
Microbial Fuel Cells ◽  
Carbon Felt ◽  
Commercial Carbon

Chemically activated graphite enhanced oxygen reduction and power output in catalyst-free microbial fuel cells

2016 ◽  
Vol 115 ◽  
pp. 332-336 ◽  
Author(s):  
Lehua Zhang ◽  
Zhihao Lu ◽  
DongMei Li ◽  
Jingxing Ma ◽  
Pengfei Song ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Oxygen Reduction ◽  
Power Output ◽  
Microbial Fuel Cells ◽  
Catalyst Free
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