Fashedemi, OOOzoemena, KI2016-04-142016-04-142015-04Fashedemi, O.O and Ozoemena, K.I. 2015. Oxygen reduction reaction at MWCNT-modified nanoscale iron(II) tetrasulfophthalocyanine: remarkable performance over platinum and tolerance toward methanol in alkaline medium. RSC Advances, vol. 5, pp 22869-228782046-2069http://pubs.rsc.org/en/Content/ArticleLanding/2015/RA/c5ra03133h#!divAbstracthttp://hdl.handle.net/10204/8474Copyright: 2015 Royal Society of Chemistry. Due to copyright restrictions, the attached PDF file only contains the abstract of the full text item. For access to the full text item, please consult the publisher's website. The definitive version of the work is published in RSC Advances, vol. 5, pp 22869-22878A 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 (E(subonset)= -0.02 V vs. Ag/AgCl), half-wave potential (E(sub1/2)= -0.32 V vs. Ag/AgCl), and high catalytic rate constant (k- 1.6x10(sup-2) cm s(sup-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.enOxygen reduction reactionNanoscale iron(II) tetrasulfophthalocyanine catalysNanoFeTSPcFuel cellArticleFashedemi, O., & Ozoemena, K. (2015). Oxygen reduction reaction at MWCNT-modified nanoscale iron(II) tetrasulfophthalocyanine: remarkable performance over platinum and tolerance toward methanol in alkaline medium. http://hdl.handle.net/10204/8474Fashedemi, OO, and KI Ozoemena "Oxygen reduction reaction at MWCNT-modified nanoscale iron(II) tetrasulfophthalocyanine: remarkable performance over platinum and tolerance toward methanol in alkaline medium." (2015) http://hdl.handle.net/10204/8474Fashedemi O, Ozoemena K. Oxygen reduction reaction at MWCNT-modified nanoscale iron(II) tetrasulfophthalocyanine: remarkable performance over platinum and tolerance toward methanol in alkaline medium. 2015; http://hdl.handle.net/10204/8474.TY - Article AU - Fashedemi, OO AU - Ozoemena, KI AB - 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 (E(subonset)= -0.02 V vs. Ag/AgCl), half-wave potential (E(sub1/2)= -0.32 V vs. Ag/AgCl), and high catalytic rate constant (k- 1.6x10(sup-2) cm s(sup-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. DA - 2015-04 DB - ResearchSpace DP - CSIR KW - Oxygen reduction reaction KW - Nanoscale iron(II) tetrasulfophthalocyanine catalys KW - NanoFeTSPc KW - Fuel cell LK - https://researchspace.csir.co.za PY - 2015 SM - 2046-2069 T1 - Oxygen reduction reaction at MWCNT-modified nanoscale iron(II) tetrasulfophthalocyanine: remarkable performance over platinum and tolerance toward methanol in alkaline medium TI - Oxygen reduction reaction at MWCNT-modified nanoscale iron(II) tetrasulfophthalocyanine: remarkable performance over platinum and tolerance toward methanol in alkaline medium UR - http://hdl.handle.net/10204/8474 ER -