Studies on the heterogeneous electron transport and oxygen reduction reaction at metal (Co, Fe) octabutylsulphonylphthalocyanines supported on multi-walled carbon nanotube modified graphite electrode

Solomon A. Mamuru, Kenneth I. Ozoemena, Takamitsu Fukuda, Nagao Kobayashi, Tebello Nyokong

Research output: Contribution to journalArticlepeer-review

63 Citations (Scopus)

Abstract

Heterogeneous electron transfer dynamics and oxygen reduction reaction (ORR) activities using octabutylsulphonylphthalocyanine complexes of iron (FeOBSPc) and cobalt (CoOBSPc) supported on multi-walled carbon nanotube (MWCNT) platforms have been described. The MWCNT-based electrodes (MWCNT-CoOBSPc and MWCNT-FeOBSPc) showed larger Faradaic current responses than the electrodes without the MWCNTs, interpreted as a consequence of the trapped electrolyte species within the porous layers of MWCNTs undergoing a redox process. The EPPGE-MWCNT-FeOBSPc showed onset potential (-0.01 V vs AgAgCl) which is comparable and even much lower than recent reports. The MWCNT-FeOBSPc showed the best ORR activity involving a direct 4-electron mechanism, with a Tafel slope of about 124 mV, indicating a 1-electron process in the rate-determining step.

Original languageEnglish
Pages (from-to)6367-6375
Number of pages9
JournalElectrochimica Acta
Volume55
Issue number22
DOIs
Publication statusPublished - 2010 Sep 1

Keywords

  • Cyclic voltammetry
  • Metal (Fe, Co) octabutylsulphonylphthalocyanines
  • Multi-walled carbon nanotubes
  • Oxygen reduction reaction
  • RDE experiment

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry

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