Design of electrolyzer system and photocatalyst material for solar fuel
태양 연료 발생을 위한 물 전기분해 장치 시스템 및 광촉매 재료 개발

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dc.description학위논문 (석사)-- 서울대학교 대학원 : 협동과정 바이오엔지니어링전공, 2016. 2. 남기태.-
dc.description.abstractThe demand for alternative energy source is one of the most important problem intercepting the future of mankind. As a solution, solar light driven energy storage, especially by hydrogen, could be the best way to store energy and utilization. Conventionally, three different systems are designed to achieve hydrogen evolution by solar light under aqueous solution : photocatalyst, photoelectrochemical (PEC) electrode, and photovoltaic-electrosynthetic (PV-EC) cell. Here, we designed new photocatalysis material and PV-EC system for obtaining hydrogen from aqueous solution efficiently.
Due to the methlyammonium lead iodide (MPI) tendency to be stabilized under low pH condition, especially under hydriodic acid, it would be possible for HI splitting reaction with solar light. Moreover, the band position is appropriate and the produced powder is also pure MPI. By applying visible light more than 475nm of wavelength, hydrogen evolution and I3- generation is detected without further degradation of MPI powder. Moreover, powder based treatment could enhance the photocatalytic activity.
PV-EC system is most industrial-friendly system for future hydrogen evolution technique by solar light. In order to achieve high solar to hydrogen efficiency, superior photovoltaic and electrolysis system, especially well made catalyst is necessary. Moreover, in order to transfer the highest power of solar cell, converting technology is indispensable. Also, the converting technology can break the diode equation and produce higher current density by sacrificing maximum voltage. Water electrolysis cell is comprised of IrO2-MnO anode material and Pt/C cathode under acidic solution. Membrane electrode assembly technique is utilized with flow to produce highest electrolysis performance. By combining solar cell, converter and electrolysis cell, we could achieve 18.9% of solar to hydrogen efficiency.
dc.description.tableofcontentsChapter 1. Introduction 1
1.1 Hydrogen as Alternative Solar Fuel 1
1.1.1 Demand for Solar Energy as Alternative Energy Source 1
1.1.2 Hydrogen as Solar Energy Storage Media 2
1.1.3 Current Process to Obtain Hydrogen 4
1.2 Ways to Obtain Hydrogen from Solar Energy 5
1.2.1 Solar to Hydrogen Efficiency 9
1.2.2 Photocatalysis 10
1.2.3 Photoelectrochemical Electrode 14
1.2.4 Photovoltaic-biased Electrosynthetic Cell 17

Chapter 2.Methylammonium Lead Iodide Photocatalysis 21
2.1 Conventional Characteristics of MPI 21
2.2 Experiment Section 22
2.2.1 Synthesis of MPI/HI(aq) system with MPI precipitate 22
2.2.2 Characterization of MPI precipitate 22
2.2.3 Solubility Measurement of MPI/HI(aq) 23
2.2.4 Gas Chromatography(GC) Measurement 24
2.2.5 Solution Absorbance Measurement 24
2.3 Material Characterization of MPI Precipitate 24
2.3.1 MPI Phase and Morphology 24
2.3.2 Band Position of MPI 28
2.3.3 Dynamic equilibrium state of MPI 31
2.4 Schemtatic Illustration of MPI/HI(aq) System 33
2.5 Characteristics of MPI/HI(aq) 36
2.5.1 Solubility of MPI in Hydriodic Acid 36
2.5.2 Absorbance of MPI/HI(aq) Solution 39
2.6 HI Splitting Activity of MPI Precipitate 41
2.6.1 Hydrogen Evolution by MPI Precipitate 41
2.6.2 I3- Generation by MPI Precipitate 47

Chapter 3. Efficient PV-EC System with Solar Cell 49
3.1 Water Splitting Electrolysis System 49
3.2 Experiment Section 52
3.2.1 Electrode Preparation 52
3.2.2 Cell Assembly Method 53
3.2.3 Material Characterization 54
3.2.4 Electrochemical Mesurment 54
3.2.5 Gas Chromatography(GC) Measurement 55
3.2.6 Solar Cell –Electrolyzer Matching Test 56
3.2.7 Solar Cell-Converter-Electrolyzer Matching Test 56
3.3 Theoratical Factor Related with PV-EC System 57
3.3.1 Effect of Catalytic Performance 62
3.3.2 Effect of Catalyst Surface Area and Resistance 65
3.4 Characteristics of Anode and Cathode 68
3.4.1 Characterization of IrO2-MnO Catalyst 68
3.4.2 Electrochemical Performance of Anode Materials 71
3.4.3 Electrochemical Performance of Cathode Materials and Total Cell 73
3.5 Electrochemical Characteristics of Flow Electrolyzer 76
3.5.1 Electrolyzer Assembly Technique 76
3.5.2 Cell Compartment Variation 78
3.6 Solar to Hydrogen Conversion with Solar Cell 88
3.6.1 Solar Cell 88
3.6.2 Solar Cell to Electrolyzer Matching 90
3.7 Converting Technology on Solar Energy Conversion 92
3.7.1 Total System Description 92
3.7.2 Maximum Power Deliver to Electrolyzer 94

Chapter 4. Conclusion 96

국문초록 98

References 100
dc.format.extent5916193 bytes-
dc.publisher서울대학교 대학원-
dc.subject메틸암모늄 납 아이오다이드-
dc.subject물 전기분해-
dc.subject아이오다이드 산 분해-
dc.titleDesign of electrolyzer system and photocatalyst material for solar fuel-
dc.title.alternative태양 연료 발생을 위한 물 전기분해 장치 시스템 및 광촉매 재료 개발-
dc.contributor.affiliation공과대학 협동과정 바이오엔지니어링전공-
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College of Engineering/Engineering Practice School (공과대학/대학원)Program in Bioengineering (협동과정-바이오엔지니어링전공)Theses (Master's Degree_협동과정-바이오엔지니어링전공)
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