Properties of Nafion/LiCl dilute solutions and H2PtCl6/Nafion dilute solutions and properties of H2PtCl6/Nafion thin films

• Main Authors: Ya-Lan Yu, 游雅蘭
• Other Authors: Hsiu-Li Lin
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/52726975842915882503

碩士 === 元智大學 === 化學工程與材料科學學系 === 97 === Nafion, an ionomer composed of perfluorocarbon backbone and vinyl ether side chains terminated with –SO3－groups, has dual solubility parameters, i.e. δ1= 9.7 (cal/cm3)1/2 relating to perfluorocarbon backbones and δ2= 17.3 (cal/cm3)1/2 relating to sulfonic acid side chains. The solubility parameters and dielectric constants of solvents have great influences on the conformations of Nafion in the catalyst solutions. In this study, we investigate the physical properties of Nafion/LiCl solutions by viscoelasticity analyzer (VE) and dynamic light scattering (DLS). Then, the differential scanning calorimeter (DSC), X-ray diffraction (XRD) and transmission electron microscope (TEM) were used to investigate the morphology of thin films prepared from H2PtCl6/Nafion solutions after reduction of Pt+4 ions to Pt. Cyclic voltammetry(CV) technique was used to determine electrochemical active surface area of Pt catalysts after reduction of Pt+4 on carbon paper. The solvents are DMAc (N,N-dimethylacetamide), DMF (N,N-dimethylformamide), NMF (N-methylformamide), MeOH/water(methanol/water), EtOH/water (ethanol/water) and IPA/water(propanol/water).