| Summary: | 碩士 === 國立臺灣科技大學 === 化學工程系 === 101 === Abstract
This research adopts the developed low temperature hydrothermal method to synthesize nano-sized Ru-doped TiO2 bimetallic oxides, and emplyed as support for Pt catalyst. First, the nano structure of different phase of metal oxides (Anatse or Rutile), heat treatment effect and effect of Ti to Ru ratios were examined. The Pt catalyst was then deposited onto the bimetal oxide supports by ethylene glycol reduction method and the effect of bimetallic oxide supports on the nanostructure of Pt catalyst was further investigated. Finally, the catalysts were applied in the electrochemical methanol oxidation reaction (MOR) and oxygen reduction reaction (ORR).
The results indicate that Anatase TiO2 supported Pt catalysts has better electrochemical activity compared that of rutile TiO2 supported Pt catalysts. Among the Ti1-xRuxO2 supported catalysts, the 20%Pt/Ti0.7Ru0.3O2 catalyst exhibits the best catalytic activity towards MOR add ORR (MOR: maxium current density 103 mA/cm2、onset potential 0.79 V/NHE), this can be ascribed to the high surface area of nano-sized support and electron-rich electroic structure of Pt. XAS characterization and computational simulation indicate that creation oxygen vacancies on Ti1-xRuxO2 supports would modify the electric structure of Pt catalysts and promote the catalytic activity. Regarding the electrode slurry fabrication engineering, 20%Pt/Ti0.7Ru0.3O2 catalyst exhibites the hightest MOR and ORR performance by adding 15% carbon in the slurry. The Ru-doped bimetallic oxides supported catalysts shows the superior electrochemical stability and corrosion resistance compared to traditional carbon supported Pt catalysts.
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