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Synthesis of Pt-Sn/Carbon Electrodes by Reduction Method for Direct Methanol Fuel Cell  

Jung, So-Mi (Department of Chemical Engineering, Inha University)
Shin, Ju-Kyung (Department of Chemical Engineering, Inha University)
Kim, Kwan-Sung (Department of Chemical Engineering, Inha University)
Baeck, Sung-Hyeon (Department of Chemical Engineering, Inha University)
Tak, Yong-Sug (Department of Chemical Engineering, Inha University)
Publication Information
Applied Chemistry for Engineering / v.21, no.5, 2010 , pp. 537-541 More about this Journal
Abstract
Pt-Sn with various ratios was supported on carbon black after pretreatment in an acidic solution by a reduction method. The Pt/Sn ratio was controlled by varying the concentration of each component in the solution, and the influence of the composition on the electrocatalytic activities was investigated. The crystallinity of the synthesized materials was investigated by XRD (X-ray Diffraction), and the oxidation states of both the platinum and tin were determined by XPS (X-ray Photoelectron Spectroscopy). SEM (Scanning Electron Microscopy)-EDS (Energy Dispersive Spectroscopy) was utilized to examine the morphology and composition of the synthesized electrode, and the particle size of the Pt-Sn was analyzed by TEM (Transmission Electron Microscopy). The electrocatalytic activity for oxygen reduction was evaluated in a 0.5 M $H_2SO_4$ solution using a rotating disk electrode system. The activity and stability were found to be strongly dependent on the electrode composition (Pt/Sn ratio). The catalytic activity and stability for methanol oxidation were also measured using cyclic voltammetry (CV) in a mixture of 0.5 M $H_2SO_4$ and 0.5 M $CH_3OH$ aqueous solution. The addition of proper amount of Sn was found to significantly improve both catalytic activity and stability for methanol oxidation.
Keywords
oxygen reduction reaction; Pt-Sn/C; methanol oxidation;
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