شماره ركورد كنفرانس :
3550
عنوان مقاله :
Studies of Polyaniline Thin Layer Presence in Electrocatalytic Properties Pt-Sn/GC Electrode Modified by MWCNT for Methanol Oxidation
پديدآورندگان :
Ahmadkhanlou Samaneh sama.ahmadkhanlou@yahoo.com Department of Chemistry, Islamic Azad University, Shahre Qods Branch, Tehran, Iran; , Nozad Golikand Ahmad Material and Nuclear Fuel Institute, NSTRI, Tehran, Iran , Arab Simin Material and Nuclear Fuel Institute, NSTRI, Tehran, Iran
كليدواژه :
Electrocatalyst , Platinum , Polymer , Tin , Methanol Oxidation
عنوان كنفرانس :
بيست و پنجمين سمينار ملي شيمي تجزيه انجمن شيمي ايران
چكيده فارسي :
The direct methanol fuel cell has been designated as a candidate for electric power sources. The methanol oxidation reaction (MOR) by itself is rather slow and requires active catalytic sites for adsorption and oxidation of methanol, As well as oxidation and repulsion of the adsorbed intermadiates [1]. In this way one of the major efforts in fuel cells catalysts research is to improve the electrocatalytic activity for methanol oxidation and methanol tolerance as well as to reduce the cost of these electro catalysts [2]. Platinum_ based catalysts supported on carbons have recently been reported to play a very important role in catalyzing MOR. Polyaniline (PANI) with porous structure and high surface area is a particulary attractive material as catalyst support [3].Electrocatalytic activities Pt and Pt_Sn nanoparticles supported on Multiwall carbon nanotubes and Vulcan carbon were examined for methanol oxidation reaction. The Pt/C, Pt_Sn/C, Pt/MWCNT, Pt_Sn/MWCNT catalysts were synthesized using a deposition_ reduction technique with sodium borohydride. The electrocatalysts were characterized by EDS, XRD, FESEM and cyclic voltammetry. From the XRD patterns, the Pt(220) peak of the PtSn/C, PtSn/MWCNT catalysts shift slightly to lower 2θ values with increasing Sn compared with that of the Pt/C, Pt/MWCNT catalysts, suggesting the alloy formation.The Pt_Sn/MWCNT electrocatalyst with an atomic ratio Pt/Sn (3:1) in MOR exhibited a higher forward peak current density and a lower peak potential during cyclic voltammetry compared to other electrocatalysts. Then the effect of glassy carbon electrode (GC) surface modification by a thin layer of polyaniline was investigated. The results showed that in present a thin layer of polyaniline and platinum-tin electrocatalytic particles supported on multiwall carbon nanotube (GC/polyaniline/Pt-Sn/CNT) the oxidation of methanol in aqueous acid media is considerably enhanced.
