Preparations and Characterizations of the Novel Organic/Inorganic Nanocomposites Membranes for the Application of Fuel Cells

• Main Authors: Han-Yi Chang, 張漢宜
• Other Authors: Chi-Wen Lin
• Format: Others
• Language: zh-TW
• Published: 2002
• Online Access: http://ndltd.ncl.edu.tw/handle/46916942352030587421

碩士 === 國立雲林科技大學 === 工業化學與災害防治研究所碩士班 === 90 === Abstract The purpose of this study is to prepare a novel class of proton exchange membrane with high ionic conductivity and low methanol permeability for the application of direct methanol fuel cells(DMFC). The basic concept is to prepare an organic/inorganic hybrid membrane by a sol-gel approach. Precursor for sol-gel reaction used was polyethylene oxide(MW=600g/mol) as organic phase, end-capped with 3-(Triethoxysil)propyl isocyanate) as inorganic phase. The silica phase was further modified by monophenyl triethoxysilane (MPH) to improve the flexibility of the membrane. The success of synthesis of the hybrid membrane was confirmed by the FT-IR spectra and the end-capping reaction kinetics was investigated by the IR analysis . The capability of the protonic conductivity of the hybrid membrane was obtained through the post-sulfonation of MPH or the incorporation of 4-Dodecylbenzene sulfonic acid (DBSA) or Sodium Dodecyl Sulfate (SDS) as a proton-carrier. Properties such as ion exchange capacity , thermal stability , and ionic conductivity of the hybrid membrane were measured and analyzed. We have performed experiments involving the use of 29Si solid state cross polarization/magic angle spinning (CP/MAS)NMR spectroscopy to characterize the hybrid precursor and MPH that containing —Si(OR)3 groups covalently bound to each other and the evaluation of the degree of polycondensation .The permeability of 3wt% methanol solution that the methanol diffusivity in the least permeable membrane (MPH80) is considerably smaller than in MPH60. Keyword : Fuel cell , DMFC , sol-gel , hybrid membranes .