Synthesis, Characterization, Functionalized and application of mesoporous materials supported Pt catalyst

• Main Authors: Min-Tsung WU, 吳旻聰
• Other Authors: Shang-Bin Liu
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/e32x3w

碩士 === 國立臺灣師範大學 === 化學系 === 96 === In view of the continuing shortages and increasing costs in fossil fuels and the increasing demands in environmental protection issues, such as suppression of greenhouse gases (CO2, chlorofluorocarbons, etc.), R&D of more economical and renewable energy resources are of great demands. Among them, fuel cells and solar, wind, nuclear, and hydrogen energies have drawn much R&D attentions. In particular, recent research and development of novel nanostructured porous silicate and porous carbon materials, which possess tunable pores in the mesoporous range, high specific surface area, high structural, hydrothermal and mechanical stabilities and unique adsorptive, electrochemical and catalytic properties, are the most promising candidates for advanced applications in energy-related sectors, for examples, as carriers for fuel storage and as catalytic supports for fuel cell electrodes. The objectives of this research are aiming at developing novel synthesis routes to fabricate novel metal (Pt) catalyst supported on amine-functionalized porous carbons (PtCNxM), and to evaluate their applications as fuel cell cathode electrodecatalysts. In particular, the dispersion of the novel metal catalyst, reduction of it loading, and the effects of surface modification by amine-functionalization, are of special interests and have been comprehensively investigated. In terms of the material synthesis, various amine-functionalized mesoporous SBA-15 slilica templates (SNxM) were prepared via using different di- and tri-aminosilanes through two different routes, namely by co-condensation and post-synthesis methods. Subsequently, fabrication of PtCNxM catalysts were replicated by co-feeding primary carbon sorces (e.g., furfuryl alcohol) and primary metal precursors (i.e., platinum acetylacetonate, which also served as secondary carbon source) into the SNxM template by incipient wetness method, followed by carbonization under vacuum at high temperatures (600-800 oC), silica template removal by hydrofluoric acid, and finally by washing, filtering and drying processes. A variety of different spectroscopic and analytical techniques, such as X-ray diffraction (XRD), N2 adsorption/desoption isotherm, elemental analysis (EA), transmission electron microscopy (TEM), induced coupled plasma mass spectroscopy (ICP-MS), Fourier-transformed infrared (FTIR) absorption spectroscopy etc., have been used to characterize the physicochemical properties of various materials. The electrochemical properties and catalytic performance of the fuel cell cathode electrocatalysts (PtCNxM) during oxygen reduction reaction were also evaluated by cyclic voltammetry (CV). The results obtained from this study should not only enhance our knowledge on the fabrication of metal catalysts supported on surface-functionalized porous carbon materials and their fundamental physicochemical properties, but also their applications as electrocatalysts for proton exchange membrane fuel cell (PEMFC) and direct methanol fuel cell (DMFC) as well as their catalytic performances during oxygen reduction reaction. Aiming at improving the catalytic activity of the cathode electrocatalysts, reduction of the catalyst fabrication costs, and applicability for commercialization, it is anticipated that the outcomes of this research should have some impact to academic research as well as industrial applications.