本研究係針對微型呼吸式直接甲醇燃料電池及不同數目之平板帶狀堆疊方式串聯的電池組性能表現進行分析，探討在不同串聯數目下之性能差異。實驗以V-I及P-I曲線探討在不同甲醇流量、操作溫度及電池堆疊數目之功率密度與極限電流密度之差異，並使用電化學阻抗頻譜法( Electrochemical impedance spectroscopy, EIS) 量測相對應的阻抗頻譜圖並分析單元電池與電池組之電化學特性，及以循環伏安法( Cyclic votammetry, CV) 量測白金觸媒之活性反應面積在堆疊數目不同時之變化。研究結果顯示，於甲醇水溶液濃度1 M、甲醇流量3 sccm、操作溫度為60 oC時，阻抗最小並可得最大功率密度34.39 mW/cm2，電池組之阻抗變化隨堆疊數目增加而上升且觸媒之活性反應面積不隨著堆疊數目產生巨大變化。除了證實本研究之電池堆疊設計法可行外，亦可針對減少電池組中之損耗作為日後改善要點，並希望藉由此方法改進設計而使其能實際運用於可攜式電子裝置上。

This study, analyzes the performances of air-breathing micro direct methanol fuel cell and planar stacks, and discusses the performance differences under different stack numbers. The experiments used V-I curve and P-I curve to analysis the maximum power density and limiting current density with different operating parameters. Moreover, electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV) methods were also adapted to measure the corresponding impedance spectroscopy and difference of electrochemically active area of Pt catalyst. The results show that the impedance has a minimum value and the power density has a maximum value of 34.39 mW/cm2 under an optimum working condition (T=60 oC, QMeOH=3sccm and C=1M), the resistance of fuel cell stack increases as the stack number increases; electrochemically active area of catalyst will not change with stack number. It can prove the method of stacking fuel cells in this study is feasible. Besides, we can focus on reducing the loss in fuel cell in the future. We hope that the fuel cell design can be improved through this method, and put fuel cell into practical application of the portable electronic device.

CONTENTS
Page
論文審定書 i
誌謝 ii
CHINESE ABSTRACT iii
ABSTRACT iv
CONTENTS v
LIST OF FIGURE viii
LIST OF TABLE xiii
NOMENCLATURE xv
CHAPTER 1 1
INTRODUCTION 1
1.1 Background 1
1.2 Classification of fuel cells 3
1.3 Literature survey 9
1.4 Objective and Motivation 31
CHAPTER 2 39
PRINCIPLE AND COMPONENTS 39
2.1 Principle of DMFC 39
2.2 Main component 42
2.3 Design of Fuel Cell 50
2.4 DMFC Stack Design 53
2.5 DMFC Cell/Stack Interconnection 54
CHAPTER 3 58
PERFORMANCE ANALYSIS OF FUEL CELL 58
3.1 Electrode Thermodynamics 58
3.2 Polarization 67
3.3 Methanol Crossover 72
3.4 Electrochemical Impedance Spectroscopy (EIS) 76
3.5 Cyclic Voltammetry (CV) 80
CHAPTER4 88
EXPERIMENTAL 88
4.1 Experimental Device and Material 88
4.2 Experimental apparatus 90
4.3 Experimental set up and procedure 95
CHAPTER 5 106
DATA REDUCTION AND UNCERTAINTIES 106
CHAPTER 6 110
RESULTS AND DISCUSSION 110
6.1 Effect of operating condition on the performance of single cell 112
6.2 Effect of operating conditions on the performance of stacks 119
6.3 Measurement and analysis of electrochemical impedance spectroscopy 127
6.4 Cyclic voltammetry measurements 138
CHAPTER 7 185
CONCLUSION AND RECOMMENDATION 185
7.1 Conclusion 186
7.2 Future Prospects 189
REFERENCES 191
APPENDIX A 211
APPENDIX B 219

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