| Summary: | 碩士 === 逢甲大學 === 化學工程學系 === 101 === In this study, hydrogen oxidation catalyst and hydrogen revolution catalyst were rapidly screened by scanning electrochemical microscopy (SECM). These arrays were prepared based on the concept of the combinational method. Primarily and dopes the multi-component alloy catalyst array by the platinum which other metal Co, Cu, Ir, Ni, Pb, Fe, Zn, Cr, Sn and Mo manufacture. The surface morphology, elemental composition and structure of electrocatalysts were characterized by scanning electron microscope (SEM), energy dispersive spectrometer (EDX) and High Resolution X-ray Diffraction （HRXRD）, respectively. Hydrogen oxidation catalyst arrays were screened with a TG-SC mode by SECM. Tip/substrate voltammetry and approach curve measurements were used to examine the kinetics of the potential electrocatalysts toward hydrogen oxidation. Results show that, Pt1Co3Cu1、Pt1Ir2Ni2和Pt1Zn4 showed better catalytic activity toward hydrogen oxidation. The kinetic parameters for hydrogen oxidation were obtained by fitting approach curves. The rate constant of the Pt-based electrocatalysts were about in the range from 0.29 to 0.32 cm/s. Hydrogen revolution catalyst arrays were screened with a SG-TC mode by SECM. Finally, there is the use of cyclic voltammetry, tafel and polarization curves to analyze the stability and kinetic parameters. In the acidic environment, Pt1Co2Cu2/C, Pt1Ir2Ni2/C, Pt1Pb1Fe3/C and Pt1Zn1Cr3/C,catalysts , and in the alkaline environment, Pt1Zn1Cr3/C and Pt2Sn1Mo2/C show better catalytic acivity.
|
|---|
