应用循环伏安法电沉积多层聚吡咯-铂复合膜电极,研究该电极的甲醇电催化氧化性能.循环伏安和计时安培法测试表明,该复合膜电极具有更好的甲醇电催化活性和抗毒性.铂量增加,电极反应控制步骤将由CO氧化转化为甲醇的吸附脱氢.
Multilayer films of polypyrrole-platinum electrode were fabricated by cyclic voltammetric technique.Electro-oxidation of methanol on this electrode was investigated with the aid of cyclic voltammetry and chronoamperometry.Results demonstrated that the multilayer of polypyrrole-platinum electrode behaved better electrocatalytic performance for electro-oxidaton of methanol and better poison resistant.Furthermore,with the increase of deposited platinum loadings,the rate controlling step on electro-oxidation reaction of methanol was changed from CO oxidation to sorption-desorption of hydrogen.
[1]Schultz T,Zhou S,Sundmacher K.Current status of andrecent developments in the direct methanol fuel cell[J].Chem Eng Technol,2001,24(12):1223-1233.
[2]Wasmus S,Kuver A.Methanol oxidation and direct me-thanol fuel cells:a selective review[J].J ElectroanalChem,1999,461(1/2):14-31.
[3]Jusys Z,Schmidt T J,Dubau L,et al.Activity of PtRu-MeOx(Me=W,Mo or V)catalysts towards methanol ox-idation and their characterization[J].J Power Sources,2002,105(2):297-304.
[4]Chu Yuan-yuan(初园园),Wu Bing(邬冰),Tang Ya-wen(唐亚文),et al.Electrocatalytic performance of Pt/C and Pt/WO3/C catalysts for methanol oxidation[J].Electrochemistry(电化学),2008,14(2):155-158.
[5]Zhou Zhen-hua(周振华),Zhou Wei-jiang(周卫江),Jiang Lu-hua(姜鲁华),et al.Mechanism of preparationprocess and characterization of highly dispersed Pt/Ccathode electrocatalyst for direct methanol fuel cell[J].Chin J Catal(催化学报),2004,25(1):65-69.
[6]Ficicioglu F,Kadirgan F.Microperoxidase-11-mediatedreduction of hemoproteins:electrocatalyzed reduction ofcytochrome c[J].J Electroanal Chem,1997,430(1/2):179-182.
[7]Wu G,Li L,Li J H,et al.Polyaniline-carbon compositefilm as supports of Pt and PtRu particles for methanolelectrooxidation[J].Carbon,2005,43(12):2579-2587.
[8]Niu L,Li Q,Wei F,et al.Electrocatalytic behavior of Pt-modified polyaniline electrode for methanol oxidation:Effect of Pt deposition modes[J].J Electroanal Chem,2005,578(2):331-337.
[9]Leone A,Marino W,Scharifker B R.Electrodepositionand electrochemical behavior of palladium particles atpolyaniline and polypyrrole films[J].J ElectrochemSoc,1992,139(2):438-443.
[10]Oliveira R T S,Santos M C,Marcussi B G,et al.Theuse of a metallic bilayer for the oxidation of small or-ganic molecules[J].J Electroanal Chem,2005,575(2):177-182.
[11]Chen A C,La Russa D J,Miller B.Effect of the iridiumoxide thin film on the electrochemical activity of plati-num nanoparticles[J].Langmuir,2004,20(22):9695-9702.
[12]Jüttnerz K,Mangold K M,Lange M.Preparation andproperties of composite polypyrrole/Pt catalyst systems[J].Russ J Electrochem,2004,40(3):317-325.
[13]Kulesza P J,Matczak M,Wolkiewicz A,et al.Electro-catalytic properties of conducting polymer based com-posite film containing dispersed platinum microparti-cles towards oxidation of methanol[J].ElectrochimActa,1999,44(12):2131-2137.
