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Effect of Keggin-type Phosphomolybdic Acid on Electro-catalytic Oxidation of Methaonol

Author: QiLiJun
Tutor: YouWanSheng
School: Liaoning Normal University
Course: Inorganic Chemistry
Keywords: Electrocatalytic oxidation of methanol Pt-based catalyst phosphomolybdic acid gold nanoparticles
CLC: O646
Type: Master's thesis
Year: 2010
Downloads: 31
Quote: 0
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Abstract


Over the past decade, the direct methanol fuel cells （DMFCs） have been considering as a promising power source for portable electronics due to their ease of handling, high-energy densities, and low operation temperatures and so on. Pt is the best catalyst for methanol electrooxidation in the DMFC. However, Pt electrocatalysts are easily poisoned by CO species during methanol electrooxidation. It is an important topic to achieve catalysts with high catalytic activity and CO tolerance in DMFC.In this work, PMo12-Pt/C catalysts were synthesized by reflux method and using H3PMo12O40 as dispersant and carbon black XC-72 as support, and characterized by transmission electron microscopy, X-ray powder diffraction and thermogravimetic analysis. The result shows that PMo-Pt/C catalysts have good dispersion and narrow size of 34 nm. Meanwhile, cyclic voltammetric responses of as-prepared PMo-Pt/C show enhanced electrocatalytic activity than that of Pt/C.AuPt/C catalysts with Au:Pt atom ratio of 0:1, 1:1, 1:5 and 1:10 were prepared by microwave-irradiation method using carbon black XC-72 as support and characterized by transmission electron microscopy, X-ray powder diffraction and energy dispersive X-ray. The result shows that AuPt/C series are unalloyed bimetallic system. TEM shows that the particles have an average size of 410 nm. Cyclic voltammetry was carried out in 0.5 M H2SO4 + 1 M CH3OH + x M H3PMo12O40 to investigate the CO tolerance during methanol electro-oxidation. It is found that AuPt/C catalysts exhibit better CO tolerance than that of Pt/C and the If/Ib values （to evaluate the tolerance of catalyst to CO poisoning） are increased from 0.7 to 1.2. The If/Ib values will increase with increasing H3PMo12O40 concentration in support electrolyte solutions and Au content in AuPt/C catalysts, but the catalytic activity to methanol electrooxidation slightly decreases. Besides, methanol electrooxidation of the Pt-modified Au （Pt-on-Au/C） catalyst was investigated in 0.5 M H2SO4 + 1 M CH3OH +x M H3PMo12O40. It is found the Pt-on-Au/C catalyst shows higher electroactive surface area than that of AuPt11/C, and the peak current density （If） of methanol oxidation is as high as twice than that on AuPt11/C.

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CLC: > Mathematical sciences and chemical > Chemistry > Physical Chemistry ( theoretical chemistry ),chemical physics > Electrochemical,electrolytic,magnetic,chemical
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