Show/Hide Menu
Hide/Show Apps
Logout
Türkçe
Türkçe
Search
Search
Login
Login
OpenMETU
OpenMETU
About
About
Open Science Policy
Open Science Policy
Open Access Guideline
Open Access Guideline
Postgraduate Thesis Guideline
Postgraduate Thesis Guideline
Communities & Collections
Communities & Collections
Help
Help
Frequently Asked Questions
Frequently Asked Questions
Guides
Guides
Thesis submission
Thesis submission
MS without thesis term project submission
MS without thesis term project submission
Publication submission with DOI
Publication submission with DOI
Publication submission
Publication submission
Supporting Information
Supporting Information
General Information
General Information
Copyright, Embargo and License
Copyright, Embargo and License
Contact us
Contact us
Mems based microbial fuel cell with microliter volume for microscale power generation
Download
12625836.pdf
Date
2020-9
Author
Şen Doğan, Begüm
Metadata
Show full item record
This work is licensed under a
Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License
.
Item Usage Stats
279
views
305
downloads
Cite This
Fuel cells can be a part of the solution to energy problem in the world. They can supply power in both macro and micro scales. Especially, MEMS based microscale microbial fuel cells (μMFC) may hold the answer to manufacture easy, cheap, fast, and mobile power sources and sensors. μMFCs are electrochemical devices converting chemical energy into electrical energy utilizing microorganisms as biocatalyst, instead of precious metal catalysts used in conventional fuel cells. They can be integrated to power, for example, lab-on-a-chip systems, or they can be used as stand-alone biosensors for sensing applications. This study focused on the development of a compact microbial fuel cell with microliter volume fabricated using silicon MEMS technology. The aim was to have high power density and low start-up time to be integrated as a power source for small devices. Several µMFC systems were operated under different conditions throughout the study. Effects of external load, anolyte type, operating conditions, and chemical modification of gold anode surfaces were compared in terms of start-up time and power densities using Shewanella oneidensis MR-1. Performances were evaluated using polarization curves, Electrochemical Impedance Spectroscopy, and Scanning Electron Microcopy. The results showed that µMFCs modified with cysteamine selfassembled monolayers resulted in more than a 50% reduction in start-up times due to better bacterial attachment on the anode surface. The volumetric power density (330 µW/cm3 ) was found to be similar in cysteamine-modified and bare gold µMFCs and was comparable to results reported in similar studies in the literature.
Subject Keywords
MEMS
,
Thiol
,
Surface modification
,
Biofilm
,
Microbial fuel cell
URI
https://hdl.handle.net/11511/69214
Collections
Graduate School of Natural and Applied Sciences, Thesis
Suggestions
OpenMETU
Core
MODELING OF BIPOLAR PLATES FOR PROTON EXCHANGE MEMBRANE FUEL CELLS
Ekiz, Ahmet; Camci, Talha; Turkmen, Ibrahim; SANKIR, MEHMET; USLU, SITKI; Baker, Derek Keıth; Agar, Ertan (2011-09-01)
Fuel cell technology is one of the most economic and efficient ways to utilize hydrogen energy. Various types of fuel cells are present regarding the fuel type and amount of power produced. Among these, proton exchange membrane fuel cells (PEMFCs) are very promising. In this work, a 2D proton exchange membrane fuel cell unit cell was modeled using Comsol Multiphysics software. Cell section was taken parallel to flow direction. Obstacles with various geometries were placed in the flow channel in order to for...
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 (MDPI AG, 2020-07-01)
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 fabrica...
Bio-fuel production from microalgae
Onay, Melih; Yücel, A Meral; Öktem, Hüseyin Avni; Department of Biochemistry (2015)
Bio-fuel is a renewable fuel and it includes different biofuel energy sources such as methane, bioethanol and biodiesel. Generally, biodiesel is produced from agricultural waste, vegetable oils such as soybean and palm oil. Third generation biofuels called as microalgae have been appeared nowadays. In the current study, biodiesel production from thermo-resistant green microalgae was focused on. For this aim, microalgae were sampled from a few hotspring points in Haymana and isolated. Identification and char...
Second law anlysis of solid oxide fuel cells
Bulut, Başar; Yamalı, Cemil; Yüncü, Hafit; Department of Mechanical Engineering (2003)
In this thesis, fuel cell systems are analysed thermodynamically and electrochemically. Thermodynamic relations are applied in order to determine the change of first law and second law efficiencies of the cells, and using the electrochemical relations, the irreversibilities occuring inside the cell are investigated. Following this general analysis, two simple solid oxide fuel cell systems are examined. The first system consists of a solid oxide unit cell with external reformer. The second law efficiency cal...
Numerical investigation of a stand alone solar hydrogen energy system effects of PEFC degradation
Ender, Ozden; Tarı, İlker (null; 2015-08-12)
An existing stand-alone solar energy system producing hydrogen for energy storage is numerically investigated focusing on the degradation of Polymer Electrolyte Fuel Cell (PEFC) and its effects on the overall performance of the system. The system consists of Photovoltaic (PV) panels, polymer electrolyte based electrolyzers, H2 and O2 storage tanks and a commercial PEFC stack. A PEFC is numerically investigated both as new and as degraded (for about two years). Using a variety of observed degradation pattern...
Citation Formats
IEEE
ACM
APA
CHICAGO
MLA
BibTeX
B. Şen Doğan, “Mems based microbial fuel cell with microliter volume for microscale power generation,” Ph.D. - Doctoral Program, Middle East Technical University, 2020.