dc.contributor.author |
Fashedemi, Omobosede O.
|
|
dc.contributor.author |
Ozoemena, Kenneth I.
|
|
dc.date.accessioned |
2017-09-21T06:11:44Z |
|
dc.date.available |
2017-09-21T06:11:44Z |
|
dc.date.issued |
2015-02 |
|
dc.description.abstract |
A nanoscale iron(II) tetrasulfophthalocyanine (nanoFeTSPc) catalyst obtained by co-ordinating with
hexadecyltrimethylammonium bromide and subsequently anchored onto multi-walled carbon
nanotubes (MWCNTs) for oxygen reduction reaction (ORR) has been reported. Two types of MWCNTs,
hydroxyl/carboxyl-functionalized (o-MWCNTs) and sulfonate-functionalized (s-MWCNTs) were used as
the supporting platforms for the catalysts (nanoFeTSPc-o-MWCNT and nanoFeTSPc-s-MWCNT, only 9
wt% loading of the nanoFeTSPc). The nanoFeTSPc-o-MWCNT gave the best performance towards ORR
in terms of high catalytic current density, more positive onset potential (Eonset ¼ 0.02 V vs. Ag/AgCl),
half-wave potential (E1/2 ¼ 0.32 V vs. Ag/AgCl), and high catalytic rate constant (k 1.6 10 2 cm s 1)
compared to the nanoFeTSPc-s-MWCNT counterpart or the Pt/XC-72 (80% Pt loading). The ORR
performance generally follows this trend: nanoFeTSPc-o-MWCNT > Pt/XC-72 > nanoFeTSPc-s-MWCNT.
The MWCNT-modified nanoFeTSPc complexes are much better than observed for the individual
components, nanoFeTSPc, o-MWCNT and s-MWCNT. In addition, the nanoFeTSPc-o-MWCNT essentially
followed a 4-electron pathway, while the nanoFeTSPc-s-MWCNT followed a 2-electron pathway. The
excellent performance of the nanoFeTSPc-o-MWCNT correlates very well with the more homogenous
dispersion and higher degree of attachment of the nanoFeTSPc on the surface of the o-MWCNT than on
the s-MWCNTs. Unlike Pt/XC-72, the nanoFeTSPc-o-MWCNT exhibited excellent tolerance toward
methanol contamination. The excellent ORR activity of the nanoFeTSPc-o-MWCNT at a very low catalyst
loading, coupled with its excellent methanol tolerance compared to the commercial platinum, promises to
serve as a viable non-noble alternative to the expensive noble metal catalysts (such as Pt and Pd) for
alkaline fuel cells. |
en_ZA |
dc.description.department |
Chemistry |
en_ZA |
dc.description.librarian |
am2017 |
en_ZA |
dc.description.sponsorship |
The CSIR as well as the South Africa's
Department of Science and Technology (DST) and National
Research Foundation (NRF) under the “Nanotechnology Flagship
Programme” (supercapacitors and fuel cell project, Grant no.
69849). OOF thanks the DST/NRF for doctoral bursary under
this project. |
en_ZA |
dc.description.uri |
http://www.rsc.org/advances |
en_ZA |
dc.identifier.citation |
Fashedemi, O.O. & Ozoemena, K.I. Oxygen reduction reaction at MWCNT-modified nanoscale iron(II) tetrasulfophthalocyanine: remarkable performance over platinum and tolerance toward methanol in alkaline medium. RSC Advances, 2015, 5, 22869-22878. |
en_ZA |
dc.identifier.issn |
2046-2069 (online) |
|
dc.identifier.other |
10.1039/c5ra03133h |
|
dc.identifier.uri |
http://hdl.handle.net/2263/62483 |
|
dc.language.iso |
en |
en_ZA |
dc.publisher |
Royal Society of Chemistry |
en_ZA |
dc.rights |
© The Royal Society of Chemistry |
en_ZA |
dc.subject |
Oxygen reduction reaction |
en_ZA |
dc.subject |
4-Electron pathway |
en_ZA |
dc.subject |
Methanol contamination |
en_ZA |
dc.subject |
Nanoscale iron(II) tetrasulfophthalocyanine (nanoFeTSPc) |
en_ZA |
dc.subject |
Multi-walled carbon nanotubes (MWCNTs) |
en_ZA |
dc.title |
Oxygen reduction reaction at MWCNT-modified nanoscale iron(II) tetrasulfophthalocyanine: remarkable performance over platinum and tolerance toward methanol in alkaline medium |
en_ZA |
dc.type |
Article |
en_ZA |