| 摘要 | 第1-8页 |
| Abstract | 第8-14页 |
| Chapter 1:literature surmarization on perfluocarbon polymer electrolyte membrane of state-of-the-art | 第14-39页 |
| ·Introduction | 第14-16页 |
| ·On the nature of perflurinated sulfonic acid ionomers | 第16-19页 |
| ·Perfluocarbon proton exchange membranes | 第19-23页 |
| ·Excluding membrane and the casting membrane | 第19-20页 |
| ·Porous PTFE reinforced perfluocarbon polymer electrolyte membrane | 第20-23页 |
| ·Durability and degradation of the current polymer electrolyte membrane | 第23-27页 |
| ·Alternative requirement of polymer electrolyte membrane for the current PEM fuel cell | 第27-31页 |
| ·Polymer electrolyte membrane meeting with the requirement of elevated and low humidity performance | 第27-30页 |
| ·Low methanol crossover polymer electrolyte membrane for direct methanol fuel cells | 第30-31页 |
| ·Summary | 第31-39页 |
| Chapter 2:improving the impregnation of PFSI polymer in porous ePTFE matrix | 第39-58页 |
| ·Introduction | 第39-40页 |
| ·Experimental | 第40-44页 |
| ·The capillary behaviors of the Nation solution in the PTFE end-sealed capillary | 第40-41页 |
| ·Preparation of the PFSI/ePTFE composite PElVIs | 第41-42页 |
| ·Characterization of the PFSI/ePTFE composite membrane | 第42页 |
| ·Gas permeability,durability and performance of the PFSI/ePTFE composite membranes | 第42-44页 |
| ·Results and discussion | 第44-54页 |
| ·The capillary behavior of the Nation solution in the end-sealed capillary | 第44-49页 |
| ·Preparation of PFSI/ePTFE PEMs with higher PFSI content | 第49-52页 |
| ·Membrane characters and swelling durability of the composite PEMs | 第52-54页 |
| ·Performance of the composite PEMs | 第54页 |
| ·Conclusions | 第54-58页 |
| Chapter 3:Improving of interface compatibility of PFSI/ePTFE composite proton exchange membranes with a chemical modified matrix | 第58-77页 |
| ·Introduction | 第58-61页 |
| ·Experimental section | 第61-65页 |
| ·Chemical modification of ePTFE matrix | 第61-62页 |
| ·Preparation of the PFSI/ePTFE composite membranes | 第62页 |
| ·Characterization of the ePTFE matrix and the PFSI/ePTFE composite membrane | 第62-64页 |
| ·Gas permeability,durability and performance of the PFSI/ePTFE composite membranes | 第64-65页 |
| ·Results and discussions | 第65-75页 |
| ·The characteristics of the ePTFE matrix | 第65-68页 |
| ·The microstmcture and gas permeability of the composite PEMs | 第68-71页 |
| ·Mechanical properties and durability of the composite PEMs | 第71-74页 |
| ·Electrochemical performance of the composite PEMs | 第74-75页 |
| ·Conclusion | 第75-77页 |
| Chapter 4:Degradation study of Nafion polymer electrolyte membrane of PEM fuel cells | 第77-97页 |
| ·Introduction | 第77-78页 |
| ·Experimental | 第78-81页 |
| ·Characterization of the proton exchange membrane | 第78-79页 |
| ·Electrochemical characterization of the proton exchange membranes | 第79-80页 |
| ·Mechanical and chemical tests of the Nation membranes | 第80-81页 |
| ·Results and Discussion | 第81-93页 |
| ·Mechanical stability of the Nafion NR111 membrane | 第81-86页 |
| ·Chemical stability and decomposition of the proton exchange membrane | 第86-91页 |
| ·Effect of polarization on the degradation of the Nafion membranes | 第91-93页 |
| ·Conclusions | 第93-97页 |
| Chapter 5:Preparation of Highly Durable Proton Exchange Membranes for Fuel Cells | 第97-115页 |
| ·Introduction | 第97-98页 |
| ·experimental | 第98-102页 |
| ·Preparation of the novel composite PEMs | 第98-99页 |
| ·Durability testing of the novel composite PEMs | 第99-100页 |
| ·Characterization of the novel composite PEMs | 第100-102页 |
| ·Results and discussion | 第102-112页 |
| ·Performance of the as-prepared PEM | 第102页 |
| ·Chemical stability of the novel composite PEMs | 第102-105页 |
| ·Physical stability of the proton exchange membranes | 第105-108页 |
| ·Integrated evaluation the novel composite PEMs durability by accelerated experiments | 第108-111页 |
| ·Origin of the stability and durability of the novel composite PEMs | 第111-112页 |
| ·Conclusions | 第112-115页 |
| Chapter 6:Improvement of Fuel Cell Performance at Low Humidify and Elevated Temperature Conditions by Self-assembled Nafion/silica Proton exchange membrane | 第115-149页 |
| ·Introduction | 第115-118页 |
| ·Experimental Section | 第118-122页 |
| ·Synthesis of Nafion-stabilized SiO_2 nanoparticles by self-assembly | 第118页 |
| ·Preparation of the Nafion/SiO_2 composite membranes | 第118-119页 |
| ·Characterization of the Nafion/SiO_2 and the composite PEMs | 第119-120页 |
| ·Durability of the Nafion/SiO_2 composite membranes | 第120-122页 |
| ·Electrochemical performance and stability of Nafion/SiO2 nanocomposite membranes | 第122页 |
| ·Results and discussion | 第122-143页 |
| ·Nafion stabilized SiO2 nanoparticles by self-assembly | 第122-126页 |
| ·Characteristics of the Nafion/SiO2 nanocomposite membranes | 第126-133页 |
| ·Durability of Nafion/SiO2 nanocomposite membranes | 第133-136页 |
| ·Water-retention and performance stability of self-assembled Nafion/SiO2 composite membranes | 第136-141页 |
| ·Water-retention and performance stability of self-assembled Nafion/SiO2 composite membranes | 第141-143页 |
| ·Conclusions | 第143-149页 |
| Chapter 7:Improvement of the Nafion-PTFE membranes for potential DMFC use by reducing the methanol crossover | 第149-164页 |
| ·Introduction | 第149-151页 |
| ·Experimental section | 第151-152页 |
| ·Synthesis of PDDA charged Pd particles. | 第151页 |
| ·Preparation of self-assembled Nafion membrane. | 第151页 |
| ·Instruments. | 第151-152页 |
| ·Results and discussions | 第152-162页 |
| ·Synthesis of the charged Pd nanoparticles | 第152-154页 |
| ·preparation of the self-assembled PEM | 第154-157页 |
| ·performances of the self-assembled PEMs | 第157-162页 |
| ·Conclusions | 第162-164页 |
| Chapter 8:Conclusions | 第164-167页 |
| Papers and Publications | 第167-171页 |
| Acknowledgements: | 第171页 |
