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

Sen-Dogan, Begum
Okan, Meltem
Afsar-Erkal, Nilufer
Ozgur, Ebru
Zorlu, Ozge
Külah, Haluk
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 (mu MFCs). Several double-chamber mu MFCs with 10.4 mu L anode and cathode chambers were fabricated using silicon-microelectromechanical systems (MEMS) fabrication technology. mu MFC 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 ofShewanella oneidensisMR-1. Performances were evaluated using polarization curves, Electrochemical Impedance Spectroscopy (EIS), and Scanning Electron Microcopy (SEM). The results showed that mu MFCs 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 mu MFCs. The power and current densities obtained in this study were comparable to those reported in similar studies in the literature.


Numerical Investigation of thermal management of Solid Oxide Fuel Cells by flow arrangement
Şen, Fırat; Tarı, İlker (null; 2015-05-29)
SolidOxide Fuel Cells (SOFCs) are electrochemical cells working at high temperatures. One of the important problems in planar SOFC designs is the non-uniformtemperature distribution on the plane of the cell due to the waste heat produced by electrochemical reactions. Another important problem of SOFCs is the low fuel utilization ratio. In this study, the effect of the flow arrangement on the temperature distribution, which causes the thermal stresses, and the met...
Enhancement in Oxygen Reduction Reaction Activity of Nitrogen-Doped Carbon Nanostructures in Acidic Media through Chloride-Ion Exposure
Jain, Deeksha; Mamtani, Kuldeep; Gustin, Vance; Gunduz, Seval; Çelik, Gökhan; Waluyo, Iradwikanari; Hunt, Adrian; Co, Anne C.; Ozkan, Umit S. (2018-07-11)
Nitrogen-doped carbon nanostructures (CNx) are promising cathode materials as catalysts for the oxygen reduction reaction (ORR) in polymer electrolyte membrane (PEM) fuel cells. Incorporation of chlorine into CNx catalysts using a facile methodology can lead to a significant improvement in the ORR activity in acidic media, as confirmed by electrochemical half-cell measurements. The chlorine-containing CNx catalyst (CNx-Cl) is synthesized by soaking CNx powder in 0.3 M HCl. The analysis of near-edge X-ray ab...
Development of 100w portable fuel cell system working with sodium borohydride
Erkan, Serdar; Eroğlu, İnci; Department of Chemical Engineering (2011)
Fuel cells are electricity generators which convert chemical energy of hydrogen directly to electricity by means of electrochemical oxidation and reduction reactions. A single proton exchange membrane (PEM) fuel cell can only generate electricity with a potential between 0.5V and 1V. The useful potential can be achieved by stacking cells in series to form a PEM fuel cell stack. There is a potential to utilize 100W class fuel cells. Fuelling is the major problem of the portable fuel cells. The aim of this th...
Performance anallysis of an intermediate temperature solid oxide fuel cell
Timurkutluk, Bora; Tarı, İlker; Department of Mechanical Engineering (2007)
An intermediate temperature solid oxide fuel cell (SOFC) is developed and its performance is investigated experimentally and theoretically. In the experimental program, a gadolinium doped ceria based membrane electrode group is developed with the tape casting and screen printing methodology and characterized. An experimental setup is devised for the performance measurement of SOFCs and the performance of produced cells is investigated over a range of parameters including the electrolyte thickness, the sinte...
Modeling of a high temperature PEM fuel cell
Sezgin, Berna; Eroğlu, İnci; Devrim, Yılser; Department of Chemical Engineering (2016)
High temperature polymer electrolyte membrane fuel cells (HT-PEMFC) are considered as the next generation of fuel cells since high temperature operation for PEM fuel cells has several advantages such as single phase operation, high carbon monoxide tolerance, low or zero carbon emission and removal of some equipment from the system. In order to obtain high performances, HT-PEMFC systems should be optimized in terms of dimensions, materials, operating conditions and other parameters. Modeling can help to pre-...
Citation Formats
B. Sen-Dogan, M. Okan, N. Afsar-Erkal, E. Ozgur, O. Zorlu, and H. Külah, “Enhancement of the Start-Up Time for Microliter-Scale Microbial Fuel Cells (mu MFCs) via the Surface Modification of Gold Electrodes,” MICROMACHINES, pp. 0–0, 2020, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/47867.