Electrocatalytic oxidation of methanol on Pt modified polyaniline in alkaline medium

被引：44

作者：

Nagashree, K. L. ^{[1
]}

Ahmed, M. F. ^{[1
]}

机构：

[1] Bangalore Univ, Dept Studies Chem, Bangalore 560001, Karnataka, India

来源：

SYNTHETIC METALS | 2008年 / 158卷 / 15期

关键词：

methanol oxidation; alkaline medium; polyaniline; Pt modification;

D O I：

10.1016/j.synthmet.2008.04.006

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A comparative study of the electrocatalytic oxidation of methanol is made in NaOH, Na2CO3 and NaHCO3 on bare Pt (Pt). polyaniline covered Pt (PANI) and Pt modified polyaniline film on Pt (Pt/PANI) using cyclic voltammetry, polarization, ac impedance spectroscopy and chronoamperometric techniques at 25 degrees C. The cyclic voltammetry and polarization studies show that the potentials at which methanol oxidation commences on different electrodes in each of the alkaline medium examined follow the trend Pt/PANI < Pt < PANI whereas the potentials for initiation of oxidation on each electrode in different alkaline media follow the order NaHCO3 > Na2CO3 > NaOH. The oxidation current is highest and charge transfer resistance lowest for Pt/PANI films compared to Pt in all the media studied. However, for the same Pt loading Pt/PANI films exhibit larger oxidation currents in NaOH followed by Na2CO3 and NaHCO3. The Tafel slope for methanol oxidation on Pt/PANI in NaOH, Na2CO3 and NaHCO3 has a value of about 115 mV decade(-1). The chronoamperometric response of the Pt/PANI film at the peak potential for methanol oxidation shows lesser sensitivity to poisoning by CO compared to bare Pt and platinised Pt (Pt/Pt). (C) 2008 Elsevier B. V. All rights reserved.

引用

页码：610 / 616

页数：7

共 35 条

[1]

AHMAD NG, 2006, J ELECTROANAL CHEM, V588, P155

[2] Status of the development of a direct methanol fuel cell [J].

Baldauf, M ;

Preidel, W .

JOURNAL OF POWER SOURCES, 1999, 84 (02) :161-166

[3] Electrocatalytic properties of platinum particles incorporated with polypyrrole films in D-glucose oxidation in phosphate media [J].

Becerik, I ;

Kadirgan, F .

JOURNAL OF ELECTROANALYTICAL CHEMISTRY, 1997, 436 (1-2) :189-193

[4] INFRARED SPECTROSCOPIC STUDY OF THE METHANOL ADSORBATES AT A PLATINUM-ELECTRODE .1. INFLUENCE OF THE BULK CONCENTRATION OF METHANOL UPON THE NATURE OF THE ADSORBATES [J].

BEDEN, B ;

HAHN, F ;

JUANTO, S ;

LAMY, C ;

LEGER, JM .

JOURNAL OF ELECTROANALYTICAL CHEMISTRY, 1987, 225 (1-2) :215-225

[5]

Christensen P. A., 1994, TECHNIQUES MECH ELEC, P268

[6]

CHUNZI H, 1997, J ELECTROCHEM SOC, V144, P970

[7] Glassy carbon electrode modified by conductive, polymeric nickel(II) porphyrin complex as a 3D homogeneous catalytic system for methanol oxidation in basic media [J].

Ciszewski, A ;

Milczarek, G .

JOURNAL OF ELECTROANALYTICAL CHEMISTRY, 1997, 426 (1-2) :125-130

[8] Electrooxidation of ethylene glycol on a platinum doped polyaniline electrode [J].

Ficicioglu, F ;

Kadirgan, F .

JOURNAL OF ELECTROANALYTICAL CHEMISTRY, 1998, 451 (1-2) :95-99

[9] Electrocatalytic oxidation of methanol on a nickel-porphyrin IX complex modified glassy carbon electrode in alkaline medium [J].

Golabi, SM ;

Nozad, A .

ELECTROANALYSIS, 2004, 16 (03) :199-209

[10] Electrocatalytic oxidation of methanol at lower potentials on glassy carbon electrode modified by platinum and platinum alloys incorporated in poly(o-aminophenol) film [J].

Golabi, SM ;

Nozad, A .

ELECTROANALYSIS, 2003, 15 (04) :278-286

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