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

doi:10.1016/j.electacta.2010.06.056

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

SCI - Chemistry

Research output: Contribution to journal › Article › peer-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 language	English
Pages (from-to)	6367-6375
Number of pages	9
Journal	Electrochimica Acta
Volume	55
Issue number	22
DOIs	https://doi.org/10.1016/j.electacta.2010.06.056
Publication status	Published - 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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Studies on the heterogeneous electron transport and oxygen reduction reaction at metal (Co, Fe) octabutylsulphonylphthalocyanines supported on multi-walled carbon nanotube modified graphite electrode. / Mamuru, Solomon A.; Ozoemena, Kenneth I.; Fukuda, Takamitsu; Kobayashi, Nagao; Nyokong, Tebello.

In: Electrochimica Acta, Vol. 55, No. 22, 01.09.2010, p. 6367-6375.

Research output: Contribution to journal › Article › peer-review

Mamuru, SA, Ozoemena, KI, Fukuda, T, Kobayashi, N & Nyokong, T 2010, 'Studies on the heterogeneous electron transport and oxygen reduction reaction at metal (Co, Fe) octabutylsulphonylphthalocyanines supported on multi-walled carbon nanotube modified graphite electrode', Electrochimica Acta, vol. 55, no. 22, pp. 6367-6375. https://doi.org/10.1016/j.electacta.2010.06.056

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

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.",

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

author = "Mamuru, {Solomon A.} and Ozoemena, {Kenneth I.} and Takamitsu Fukuda and Nagao Kobayashi and Tebello Nyokong",

note = "Funding Information: We thank the National Research Foundation (NRF) and CSIR for supporting this work. S.A.M thanks NRF for the prestigious Nanoflagship PhD bursary and Adamawa State University for study leave and financial support. Copyright: Copyright 2011 Elsevier B.V., All rights reserved.",

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AU - Kobayashi, Nagao

AU - Nyokong, Tebello

N1 - Funding Information: We thank the National Research Foundation (NRF) and CSIR for supporting this work. S.A.M thanks NRF for the prestigious Nanoflagship PhD bursary and Adamawa State University for study leave and financial support. Copyright: Copyright 2011 Elsevier B.V., All rights reserved.

PY - 2010/9/1

Y1 - 2010/9/1

N2 - 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.

AB - 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.

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

Abstract

Keywords

ASJC Scopus subject areas

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