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TECHNICAL BRIEFS

Preparation and Characterization of Pt/Superfine Mesocarbon Microbead Powers Electrocatalysts

[+] Author and Article Information
Jia Rong-Li, Wang Cheng-Yang

Key Laboratory for Green Chemical Technology of State Education Ministry, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, P. R. China

Zhu Bin

Chemical Engineering and Technology/Chemical Reaction Engineering, Royal Institute of Technology (KTH), S-100 44 Stockholm, Sweden

J. Fuel Cell Sci. Technol 3(3), 358-360 (Nov 17, 2005) (3 pages) doi:10.1115/1.2217958 History: Received August 30, 2005; Revised November 17, 2005

Superfine mesocarbon microbead powders (SFMCMBs) as the new supports for platinum electrocatalysts were first investigated. The PtSFMCMB electrocatalysts were prepared by an impregnation-reduction method, with hexachloroplatinic acid as the platinum precursor and formaldehyde as the reducing agent. The catalysts were characterized with x-ray diffraction (XRD), field emission gun transmission electron microscope (TEM), and electrochemical analysis. TEM photos showed the platinum particles were dispersed uniformly on the surface of SFMCMBs and there existed a little aggregation of platinum particles in the PtSFMCMB catalysts. The TEM photos showed the existence of the platinum on the supports where the average platinum particle size were 46nm. The electrochemical analysis proved that SFMCMBs are excellent candidates to be used as the support of platinum electrocatalyst for methanol electrochemical oxidation as the potential catalyst candidate for direct methanol fuel cells (DMFCs).

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Figures

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Figure 1

Micrograph of (a) the supports (SEM) and the Pt∕SFMCMB catalysts (TEM)

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Figure 2

XRD patterns of the Pt∕SFMCMB catalyst

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Figure 3

Cyclic voltammetry of the 10wt%Pt∕SFMCMB and the 20wt%Pt∕C electrocatalyst in 0.5MH2SO solution at a scan rate of 20mVs−1

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Figure 4

Linear sweep voltammograms at room temperature for the methanol oxidation on the Pt∕SFMCMB and 20wt%Pt∕C catalysts in 1molL−1H2SO4+1molL−1 methanol at a scan rate of 1mVs−1

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