•  
  •  
 

Abstract

The adsorption and oxidation of ethanol on nm?Pt/GC electrode in acid solutions containing 0.1 mol·L -1 H 2SO 4 +0.1 mol·L -1 CH 3CH 2OH was investigated by using cyclic voltammetry , EQCM and in?situ FTIR spectroscopy. The experimental results demonstrated that the oxidation of CH 3CH 2OH is closely relaed to solution acidity and oxygen species on electrode surface; CH 3CH 2OH was oxidized on nm?Pt/GC electrode in acidic media via a dual path reaction mechanism, i.e . CH 3CH 2OH may be oxidized into CO 2 through the dissociative adsorbate (CO) and the reactive intermediates that were determined by FTIRS as mainly CH 3CHO and CH 3COOH species.

Keywords

nm?Pt/GC, Electrooxidation, Ethanol, In?situ FTIRS, EQCM

Publication Date

2001-02-28

Online Available Date

2001-02-28

Revised Date

2001-02-28

Received Date

2001-02-28

References

[1] McNicolBD ,Electrocatalyticproblemsassociatedwiththedevelopmentofdirectmethanol airfuelcells[J].J .Electroanal.ChemInterfacialElectrochem ,1981,118:71.

[2 ] CaramJA ,GutierretC .Cyclicvoltammetricandpotential modulatedreflectancestudyoftheelectroadsorp tionofCOmethanolandethanolonapalladiumelectrodeinacidandalkalinemedia[J].J.Electroanal.Chem .,1993,344:313.

[3] SouzaJPI,MeshbesherTM ,FloydSetal.Performanceofaco electrodepositedPt Ruelectrodefortheelectro oxidationofethanolstudiedbyinsituFTIRspectroscopy[J].J .Electroanal.Chem .,1997,4 2 0 :17.

[4 ] BuschmannHW ,WilhelmS ,VielstichW .Onthestudyofmethanoloxidationbyelectrochemical.SIMS[J].J .Electrochim ..Acta ,1986 ,31:939.

[5] BurkeLD .UnusualpostmonolayeroxidebehaviorofGoldelectrodeinbase[J].J .Electrochem .Soc.,1992 ,139:399.

[6 ] BurkeLD ,LeeBH .Aninvestigationoftheelectrocatalyticbehaviorofgoldinaqueousmedia[J].J.Elec troanl.Chem 1992 ,330 :6 37.

[7] ChenGL ,SunSG ,ChenSPetal.Cyclicvoltammogramsandin -situFTIRspectroscopicstudiesofad sorptionandoxidationofethanolonnm Pt/GCelectrode[J].Electrochemistry ,(inchinese) ,2 0 0 0 ,6 (4 ) :4 0 6 .

[8 ] SunSG ,YangDF ,TianZW .InSituFTIRStudiesontheAdsorptionandOxidationofn - propanolandiso - propanolataPtElectrodeinSulphuricAcidMedium[J].J .Electroanal.Chem .,1990 ,2 89:177.

[9] NicholsRJ ,BewickA .SNIFTIRSwithaflowcell:theidentificationofthereactionintermediatesinmethanoloxidationatPtelectrode[J].J.Electrochim ..Acta ,1988,33:16 91.

[10 ] LuGQ ,SunSQ ,CaiLR ,etal.InsituFTIRspectroscopicstudiesofadsorptionofCO ,SCN -andPoly(o - phenylenediamine)onelectrodesofnanometerthinfilmsofPt ,PdandRh :Theabnormalinfraredef fects (AIREs) [J].LANGMUIR ,2 0 0 0 ,16 (12 ) :778.

[11] IwasitaT ,RaschB ,CattaneoE ,etal.ASNIFTIRSstudyofethanoloxidationonPlatinum [J].J .Elec trochimicaActa ,1989,34:10 73.

[12 ] DongQing nian .ThemethodsofInfraredSpectroscopy[M ],Bejing ;ChemicalIndustryPress ,1979,10 4 ,12 8.

Share

COinS
 
 

To view the content in your browser, please download Adobe Reader or, alternately,
you may Download the file to your hard drive.

NOTE: The latest versions of Adobe Reader do not support viewing PDF files within Firefox on Mac OS and if you are using a modern (Intel) Mac, there is no official plugin for viewing PDF files within the browser window.