Oxidation of Several p-Phenylenediamines in Room Temperature Ionic Liquids: Estimation of Transport and Electrode Kinetic Parameters
dc.contributor.author | Long, J. | |
dc.contributor.author | Silvester, Debbie | |
dc.contributor.author | Barnes, A. | |
dc.contributor.author | Rees, N. | |
dc.contributor.author | Aldous, L. | |
dc.contributor.author | Hardacre, C. | |
dc.contributor.author | Compton, R. | |
dc.date.accessioned | 2017-01-30T15:10:55Z | |
dc.date.available | 2017-01-30T15:10:55Z | |
dc.date.created | 2014-09-09T20:01:03Z | |
dc.date.issued | 2008 | |
dc.identifier.citation | Long, J. and Silvester, D. and Barnes, A. and Rees, N. and Aldous, L. and Hardacre, C. and Compton, R. 2008. Oxidation of Several p-Phenylenediamines in Room Temperature Ionic Liquids: Estimation of Transport and Electrode Kinetic Parameters. Journal of Physical Chemistry C. 112 (17): pp. 6993-7000. | |
dc.identifier.uri | http://hdl.handle.net/20.500.11937/43925 | |
dc.identifier.doi | 10.1021/jp800235t | |
dc.description.abstract |
The electrochemical oxidation of N,N,N‘,N‘-tetramethyl-p-phenylenediamine (TMPD) has been studied by cyclic voltammetry and potential step chronoamperometry at 303 K in five ionic liquids, namely [C2mim][NTf2], [C4mim][NTf2], [C4mpyrr][NTf2], [C4mim][BF4], and [C4mim][PF6] (where [Cnmim]+ = 1-alkyl-3-methylimidazolium, [C4mpyrr]+ = N-butyl-N-methylpyrrolidinium, [NTf2]- = bis(trifluoromethylsulfonyl)imide, [BF4]- = tetrafluoroborate, and [PF6]- = hexafluorophosphate). Diffusion coefficients, D, of 4.87, 3.32, 2.05, 1.74, and 1.34 × 10-11 m2 s-1 and heterogeneous electron-transfer rate constants, k0, of 0.0109, 0.0103, 0.0079, 0.0066, and 0.0059 cm s-1 were calculated for TMPD in [C2mim][NTf2], [C4mim][NTf2], [C4mpyrr][NTf2], [C4mim][BF4], and [C4mim][PF6], respectively, at 303 K. The oxidation of TMPD in [C4mim][PF6] was also carried out at increasing temperatures from 303 to 343 K, with an activation energy for diffusion of 32.3 kJ mol-1. k0 was found to increase systematically with increasing temperature, and an activation energy of 31.4 kJ mol-1 was calculated. The study was extended to six other p-phenylene-diamines with alkyl/phenyl group substitutions. D and k0 values were calculated for these compounds in [C2mim][NTf2], and it was found that k0 showed no obvious relationship with the hydrodynamic radius, r. | |
dc.publisher | American Chemical Society | |
dc.title | Oxidation of Several p-Phenylenediamines in Room Temperature Ionic Liquids: Estimation of Transport and Electrode Kinetic Parameters | |
dc.type | Journal Article | |
dcterms.source.volume | 112 | |
dcterms.source.number | 17 | |
dcterms.source.startPage | 6993 | |
dcterms.source.endPage | 7000 | |
dcterms.source.issn | 1932-7447 | |
dcterms.source.title | Journal of Physical Chemistry C | |
curtin.accessStatus | Fulltext not available |