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http://dx.doi.org/10.3740/MRSK.2015.25.3.113

Methanol Electro-Oxidation Properties of Pt Electro-Catalysts Embedded by Porous Carbon Nanofiber Supports  

Sin, Dong-Yo (Department of Materials Science and Engineering, Seoul National University of Science and Technology)
An, Geon-Hyoung (Department of Materials Science and Engineering, Seoul National University of Science and Technology)
Ahn, Hyo-Jin (Department of Materials Science and Engineering, Seoul National University of Science and Technology)
Publication Information
Korean Journal of Materials Research / v.25, no.3, 2015 , pp. 113-118 More about this Journal
Abstract
To improve the methanol electro-oxidation in direct methanol fuel cells(DMFCs), Pt electrocatalysts embedded on porous carbon nanofibers(CNFs) were synthesized by electrospinning followed by a reduction method. To fabricate the porous CNFs, we prepared three types of porous CNFs using three different amount of a styrene-co-acrylonitrile(SAN) polymer: 0.2 wt%, 0.5 wt%, and 1 wt%, respectively. A SAN polymer, which provides vacant spaces in porous CNFs, was decomposed and burn out during the carbonization. The structure and morphology of the samples were examined using field emission scanning electron microscopy and transmission electron microscopy and their surface area were measured using the Brunauer-Emmett-Teller(BET). The crystallinities and chemical compositions of the samples were examined using X-ray diffraction and X-ray photoelectron spectroscopy. The electrochemical properties on the methanol electro-oxidation were characterized using cyclic voltammetry and chronoamperometry. Pt electrocatalysts embedded on porous CNFs containing 0.5 wt% SAN polymer exhibited the improved methanol oxidation and electrocatalytic stability compared to Pt/conventional CNFs and commercial Pt/C(40 wt% Pt on Vulcan carbon, E-TEK).
Keywords
methanol electro-oxidation; porous carbon nanofibers; supports; platinum electrocatalysts; electrospinning;
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