Performance Improvement of Polymer Electrolyte Membrane Fuel Cells Operating in Low Humidity Conditions Using Modified Membranes
- Title
- Performance Improvement of Polymer Electrolyte Membrane Fuel Cells Operating in Low Humidity Conditions Using Modified Membranes
- Author(s)
- Hyunsik Oh
- DGIST Authors
- Hyunsik Oh ; Sangaraju Shanmugam ; Byungrak Son
- Advisor
- 상가라주 샨무감
- Co-Advisor(s)
- Byungrak Son
- Issued Date
- 2023
- Awarded Date
- 2023-08-01
- Type
- Thesis
- Description
- Polymer electrolyte membrane fuel cell; Perovskite; Multi-metal oxide; Radical scavenger; low relative humidity
- Table Of Contents
-
Ⅰ. INTRODUCTION 1
1.1 Background of the emergence of fuel cells 1
1.2 Overview of Fuel Cells 2
1.2.2 Energy Conversion Principle 2
1.2.2 Various types of fuel cells 3
1.3 Polymer Electrolyte Membrane Fuel Cells (PEMFCs) 5
1.3.1 Operating principles and components of PEMFC 5
1.3.2 Advantages and Challenges of PEMFCs 7
1.4 Perfluorinated membranes 8
1.4.1 PESA membranes 8
1.4.2 Proton transfer pathway in PEM 10
1.4.3 Chemical degradation mechanism of PEM 11
1.5 Objectives and Approach of the research 12
Ⅱ. EXPERIMENTAL SECTION 15
PART Ⅰ 15
2.1 Synthesis of Ce0.667Zr0.05Ti0.95O3 metal oxides 15
2.2 Materials characterization 15
2.3 Production of Nafion-Ce0.667Zr0.05Ti0.95O3 composite membrane 16
2.4 Characterization of Nafion-CZTO composite membrane 17
2.4.1 Water Uptake Analysis 17
2.4.2 Analysis of Ion Exchange Capacity (IEC) 18
2.4.3 Oxidative Stability Analysis 18
2.4.4 Thermal Gravimetric Analysis (TGA) 19
2.4.5 Thermal Mechanical Analysis (TMA) 19
2.4.6 Tensile Strength Test 19
2.5 Electrochemical characterization 20
2.6 MEA preparation and a Fuel cell test 20
2.6.1. Modify Ce0.667Zr0.05Ti0.95O3 to the cathode catalyst layer 21
PART Ⅱ 23
2.1 Synthesis of Ti3C2Tx 23
2.1.1 Attachment process of a hydroxyl group of Ti3C2Tx 23
2.2 Materials characterization 23
2.3 Production of Nafion- Ti3C2Tx composite membrane 24
2.4 Characterization of Nafion- Ti3C2Tx composite membrane 25
2.4.1 Water Uptake Analysis 25
2.4.2 Analysis of Ion Exchange Capacity (IEC) 25
2.5 Tensile Strength Test 26
2.6 MEA preparation and a Fuel cell test 26
Ⅲ. RESULTS AND DISCUSSION 28
PART Ⅰ 28
3.1 Characterization of Metal Oxide Nanoparticles 28
3.2 Characterization of Nafion-CZTO NPs composite membrane 34
3.2.1 The existence of CZTO NPs in the composite membrane 34
3.2.2 Water retention capability of the composite membrane 36
3.2.3 Thermal, mechanical stability 38
3.2.4 Proton conductivity and Arrhenius plots 42
3.3 Electrochemical characterization 45
3.4 Fuel Cell performance test 48
3.5 Electrochemical Impedance analysis 55
3.6 The durability assessment of Membrane Electrode Assembly 61
PART Ⅱ 66
3.1 Characterization of Ti3C2Tx 66
3.2 Formation of functional groups on Ti3C2Tx 69
3.3 Characterization of Nafion-Ti3C2Tx composite membrane 70
3.3.1 Water retention capacity of the composite membrane 70
3.3.2 Proton conductivity measurement 72
3.4 Tensile strength test 74
3.5 Fuel Cell performance test 75
Ⅳ. CONCLUSIONS 78
Ⅴ. REFERENCES 80
Ⅵ. 요약문 84
- URI
-
http://hdl.handle.net/20.500.11750/46439
http://dgist.dcollection.net/common/orgView/200000687717
- Degree
- Master
- Department
- Department of Energy Science and Engineering
- Publisher
- DGIST
- Related Researcher
-
-
Shanmugam, Sangaraju
- Research Interests Electrocatalysts for fuel cells; water splitting; metal-air batteries; Polymer electrolyte membranes for fuel cells; flow batteries; Hydrogen generation and utilization
-
- Files in This Item:
-
There are no files associated with this item.
- Appears in Collections:
- Department of Energy Science and Engineering Theses Master
Items in Repository are protected by copyright, with all rights reserved, unless otherwise indicated.