- Title
- Preferential electrosorption of cobalt (II) tetra-aminophthalocyanine at single-wall carbon nanotubes immobilized on a basal plane pyrolytic graphite electrode
- Creator
- Ozoemena, Kenneth I
- Creator
- Pillay, J
- Creator
- Nyokong, Tebello
- Date Issued
- 2006
- Date
- 2006
- Type
- Article
- Identifier
- vital:6584
- Identifier
- http://hdl.handle.net/10962/d1004160
- Description
- This communication describes the preferential electrosorption of cobalt (II) tetra-aminophthalocyanine (CoTAPc) (rather than the expected electropolymerisation) onto a SWCNT immobilized on a basal plane pyrolytic graphite electrode (BPPGE). Cyclic voltammetric and electrochemical impedance spectroscopic data revealed that the electrosorbed CoTAPc is highly stable, well organized with comparable electron-transfer rate constant in ferricyanide solution (k[subscript app] ~ 6 × 10[superscript (−5)] cm s[superscript (−1)] order) to that of the SWNCT. Electrochemical kinetics of the electrosorbed CoTAPc yielded k[subscript s] of 0.169 s[superscript (−1)] and 832.2 s[superscript (−1)] for the cathodic and anodic reactions, respectively, indicative of different rate-determining steps for the cathodic and anodic reactions. Strong π-stacking interactions between CoTAPc and the sidewalls of the SWCNTs, with possible synergistic covalent interactions, are explained as responsible for the preferential electrosorption process. Both BPPGE-SWCNT-CoTAPc[subscript (ads)] and BPPGE-SWCNT showed comparable electrocatalytic responses towards the detection of 2-(diethylamino) ethanethiol (DEAET).
- Format
- 9 p.
- Language
- English
- Relation
- Ozoemena, K.I. and Pillay, J. and Nyokong, T. (2006) Preferential electrosorption of cobalt (II) tetra-aminophthalocyanine at single-wall carbon nanotubes immobilized on a basal plane pyrolytic graphite electrode. Electrochemistry Communications, 8 (8). pp. 1391-1396. Available: http://dx.doi.org/10.1016/j.elecom.2006.05.031
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Nyokong, Tebello (Distinguished Professor)
RU Department of Chemistry
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