期刊
ELECTROCHIMICA ACTA
卷 55, 期 22, 页码 6367-6375出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2010.06.056
关键词
Metal (Fe, Co); octabutylsulphonylphthalocyanines; Multi-walled carbon nanotubes; Cyclic voltammetry; RDE experiment; Oxygen reduction reaction
资金
- National Research Foundation (NRF)
- CSIR
- Adamawa State University
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 vertical bar 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. (C) 2010 Elsevier Ltd. All rights reserved.
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