01678nas a2200217   4500008004100000022001400041245010600055210006900161260007300230300001200303490000800315520087100323653002401194653002101218653001501239653002301254653001601277100002201293700002201315856012301337       2006                        eng d  a0378-775300aRole of dopant ions in electrocatalytic oxidation of methanol using conducting polypyrrole electrodes0 aRole of dopant ions in electrocatalytic oxidation of methanol us  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcAPR  a157-1600 v1553 a<p>Conducting polypyrrole electrodes obtained by electro-polymerization of pyrrole on vacuum metallized glass substrates are modified by doping with a range of metal halides as dopant ions having different electronegativity. Electro-oxidation of methanol using these electrodes is studied by means of cyclic voltammetry in 0.1 M HCiO(4) as supporting electrolyte. It is found that the electronegativity of the dopant ion plays a very important role in the electrocatalytic activity. Polypyrrole doped with zirconium chloride gives the highest anodic current of 10 mA cm(-2) at the oxidation potential of methanol. The results are explained on the basis of the charge-transfer efficiency at the electrode I electrolyte interface, which is associated with the acceptor state created by the dopant in the semi-conducting polymer. (c) 2005 Published by Elsevier B.V.</p>10aconducting polymers10aelectrocatalysis10afuel cells10aMethanol oxidation10apolypyrrole1 aRadhakrishnan, S.1 aAdhikari, Arindam  uhttps://library.ncl.res.in/content/role-dopant-ions-electrocatalytic-oxidation-methanol-using-conducting-polypyrrole-002353nas a2200229   4500008004100000022001400041245013300055210006900188260006700257300001400324490000800338520147800346653003401824653002401858653001401882653002501896653001501921100002201936700002201958700001601980856012701996       2012                        eng d  a0021-899500aEffect of the surface roughness of conducting polypyrrole thin-film electrodes on the electrocatalytic reduction of nitrobenzene0 aEffect of the surface roughness of conducting polypyrrole thinfi  a111 RIVER ST, HOBOKEN 07030-5774, NJ USAbWILEY-BLACKWELLcAUG  a1875-18810 v1253 a<p>Conducting polypyrrole (PPy) thin-film electrodes were prepared by the electropolymerization of pyrrole on gold-coated glass plates. Films of various roughnesses were obtained by the variation of the scan rates during electropolymerization. These thin films were modified by doping with 6mM of the dopant NiCl2. The surface morphology of the films was studied by scanning electron microscopy and atomic force microscopy (AFM), which suggested films prepared with a high scan rate were rougher in nature than the films produced with a low scan rate. The electrocatalytic reduction of nitrobenzene was carried out with these electrodes with the cyclic voltammetry technique in acetonitrile containing 0.1M HClO4 as a supporting electrolyte. The various results obtained show that the conducting PPy thin-film electrodes were catalytically active toward the electroreduction process. The modified PPy film electrodes doped with NiCl2 were more active toward nitrobenzene electroreduction than the PPy film alone. The results indicate that the roughness of the films played a very important role in determining their catalytic activity. The PPy films that were more rough in nature were catalytically more active than the smooth films; this may have been due to the availability of more reactive sites in the case of rough films. The apparent diffusion coefficients of the PPy film electrodes were also calculated. (c) 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012</p>10aatomic force microscopy (AFM)10aconducting polymers10aDiffusion10asurface modification10aThin films1 aAdhikari, Arindam1 aRadhakrishnan, S.1 aVijayan, M.  uhttps://library.ncl.res.in/content/effect-surface-roughness-conducting-polypyrrole-thin-film-electrodes-electrocatalytic-0