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

• Published in: Electrochimica acta 2010-09, Vol.55 (22), p.6367-6375
• Main Authors: Mamuru, Solomon A., Ozoemena, Kenneth I., Fukuda, Takamitsu, Kobayashi, Nagao, Nyokong, Tebello
• Format: Article
• Language: English
• Subjects: Chemistry; Cobalt plating; Cyclic voltammetry; Electrochemistry; Electrodes; Electrolytes; Exact sciences and technology; General and physical chemistry; Graphite; Iron; Kinetics and mechanism of reactions; Metal (Fe, Co) octabutylsulphonylphthalocyanines; Multi wall carbon nanotubes; Multi-walled carbon nanotubes; Oxygen reduction reaction; Platforms; RDE experiment; Reduction (electrolytic)
• ISSN: 0013-4686; 1873-3859
• DOI: 10.1016/j.electacta.2010.06.056

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 Ag|AgCl) 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.