Method for preparing highly dispersed Pt catalysts on mesoporous carbon support

Two Pt catalysts supported on template-synthesized mesoporous carbons (MC) were prepared by the conventional wet-impregnation method (Pt-impreg/MC) and by the less commonly used colloidal deposition method (Pt-coll/MC) to examine the effect of preparation method on catalyst performance. The catalyst...

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Bibliographic Details
Published in:Journal of materials science 2007-09, Vol.42 (17), p.7191-7197
Main Authors: Zeng, Jianhuang, Su, Fabing, Lee, Jim Yang, Zhao, X. S, Chen, Jianjun, Jiang, Xiaohua
Format: Article
Language:English
Subjects:
Acidic oxides
ambient temperature
Anodic stripping
Carbon
Catalysis
Catalysts
Chemical synthesis
Chemistry
Colloidal state and disperse state
Electron microscopy
Electrons
Emission analysis
Entrapment
Exact sciences and technology
Fuel cells
General and physical chemistry
Materials science
Methanol
Methyl alcohol
Microscopy
Nanoparticles
Oxidation
Performance enhancement
Physical and chemical studies. Granulometry. Electrokinetic phenomena
Platinum
Porous materials
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
Thermogravimetric analysis
thermogravimetry
Transmission electron microscopy
Voltammetry
X-ray diffraction
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Summary:Two Pt catalysts supported on template-synthesized mesoporous carbons (MC) were prepared by the conventional wet-impregnation method (Pt-impreg/MC) and by the less commonly used colloidal deposition method (Pt-coll/MC) to examine the effect of preparation method on catalyst performance. The catalysts were characterized by transmission electron microscopy, field-emission electron microscopy, thermogravimetric analysis and X-ray diffraction. The electro-oxidation of methanol in acidic solutions for direct methanol fuel cells at room temperature was used as the test reaction. CO anodic stripping voltammetry and cyclic voltammetry both recorded enhanced performance for Pt-coll/MC relative to Pt-impreg/MC. The poorer application performance of Pt-impreg/MC can be attributed to the transport resistance in the mesopores, and to the entrapment of a sizable fraction (40%) of Pt nanoparticles in the mesopores which are not readily accessible to the reactants under the reaction conditions.
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-007-1571-4