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Development of Hybrid Microbial Fuel Cell for Improved Power Generation under Solar Irradiation

Title
Development of Hybrid Microbial Fuel Cell for Improved Power Generation under Solar Irradiation
Translated Title
태양빛을 이용한 파워 생산 효율이 증가된 하이브리드 미생물 연료전지의 개발
Authors
Kim, Hyeon Woo
DGIST Authors
Kim, Hyeon Woo; In, Su Il
Advisor(s)
In, Su Il
Co-Advisor(s)
Kim, Ma Rie
Issue Date
2015
Available Date
2015-01-12
Degree Date
2015. 2
Type
Thesis
Keywords
Microbial fuel cellsPhotoactive materialHybrid solar SystemAnodizationOxygen reduction reaction미생물 연료전지광활성 물질광 하이브리드 시스템양극산화산소환원반응
Abstract
Fossil fuels are running out because of human activities, and consumption of fossil fuels increases concentration of carbon dioxide that causes global warming. Therefore, developing a new renewable energy is needed. Microbial fuel cells (MFCs) are eco-friendly technology that can treat wastewater and generate bioelectricity at the same time. But there are some limitations such as low power output and expensive material cost. Thus, this study was conducted to overcome low efficiency of MFCs by developing a new solar hybrid system and current collector that can reduce internal resistance of MFCs. First, suitable photoactive material must be used to harvest sunlight. In this study, N-doped TiO2 nanotubes were used as photoanodes because of their photostability, high electron transfer ability and broad absorption range. Additional electrons are generated from photoanode by light irradiation and it increased power output around 34.9 % compared with a normal MFC reactor. Second, the effect of current collectors was investigated. Current collector must have corrosion resistance in the aqueous solution. Therefore, titanium and stainless steel were used. Graphene oxide is coated on the current collector surface because of its excellent mobility of charge carriers, a large specific surface and good mechanical stability. The highest voltage was generated from the reactor which nanostructured stainless steel 304 mesh was used (452 mV). ⓒ 2015 DGIST
Table Of Contents
I. Introduction 2-- 1. Research Background 2-- 2. Electron Transfer Mechanism 3-- 3. References 5 -- II. Equipment 7 -- 1. Field Emission Scanning Electron Microscope (FE-SEM) 7-- 2. Potentiostat 8 -- 3. X-ray Photoelectron Spectrometer (XPS) 9 -- 4. X-ray Diffractometer (XRD) 10 -- 5. References 12-- III. Investigation of N-doped Titanium Dioxide Nanotubes for The System of Hybrid Solar Microbial Fuel Cell 13-- 1. Introduction 13 -- 2. Experimental Section 14-- 2.1 Materials 14 -- 2.2 MFC set-up 15-- 2.3 Inoculum, substrate and medium 16-- 2.4 Photoanode preparation 16 -- 2.5 Operating procedures 16-- 2.6 Preparation of SEM samples 17-- 2.7 Analysis17 -- 3. Results and Discussion 18-- 3.1 FE-SEM Analysis of Photoanode and Microorganisms on the Anode Surface 18-- 3.2 XRD patterns of photoanode 19-- 3.3 XPS analysis of photoanode 20 -- 3.4 Photocurrent measurement of photoanode 22-- 3.5 Polarization and Power density curves of SMFC 22 -- 4. Conclusions 23 -- 5. References 25 -- IV. Investigation of Current Collectors with Graphene Oxide Coating for Enhance Microbial Fuel Cells Performance 27 -- 1. Introduction 27 -- 2. Experimental Section 28 -- 2.1 Materials 28-- 2.2 Electrical anodization of titanium mesh and stainless steel 304 mesh current collectors 28 -- 2.3 Preparation of graphene oxide coated current collectors 28 -- 2.4 Inoculum, substrate and medium 29-- 2.5 MFC set-up 29 -- 2.6 Analysis 29 -- 3. Results and Discussion 29 -- 3.1 SEM images of normal and graphene oxide coated current collectors 29 -- 3.2 Voltage generation patterns of various microbial fuel cells 31 -- 4. Conclusions 32 -- 5. References 33 -- V. Conclusions 35
URI
http://dgist.dcollection.net/jsp/common/DcLoOrgPer.jsp?sItemId=000001915992
http://hdl.handle.net/20.500.11750/1380
DOI
10.22677/thesis.1915992
Degree
Master
Department
Energy Systems Engineering
University
DGIST
Files:
Collection:
Energy Science and EngineeringThesesMaster


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