1 Ocak 2009 Dergi makalesi Açık Erişim

Koc, I.; Oezer, M.; Oezkaya, A. R.; Bekaroglu, O.

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        "affiliation": "Marmara Univ, Dept Chem, TR-34722 Goztepe, Turkey", 
        "name": "Koc, I."
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      {
        "affiliation": "Marmara Univ, Dept Chem, TR-34722 Goztepe, Turkey", 
        "name": "Oezer, M."
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      {
        "affiliation": "Marmara Univ, Dept Chem, TR-34722 Goztepe, Turkey", 
        "name": "Oezkaya, A. R."
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      {
        "affiliation": "Tech Univ Istanbul, Dept Chem, TR-34469 Maslak, Turkey", 
        "name": "Bekaroglu, O."
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    "description": "Electrocatalytic activitiy, methanol tolerance and stability of three phthalocyanine (Pc) complexes (a heptadecafluorononyl-substituted mononuclear CoPc 1, a pentaerythritol-bridged ball-type dinuclear Co2Pc2 2 and a heptadecafluorodecyl-substituted, pentaerythritol-bridged ball-type dinuclear Co2Pc2 3) and the performance of dual catalysts of 2/Pt and 3/Pt, dispersed on a high surface area carbon substrate, Vulcan XC-72 (VC) and Nafion (Nf), towards oxygen reduction (OR) were investigated and compared by surface cyclic voltammetry, rotating disk electrode, rotating ring-disk electrode and chronoamperometry experiments in acidic medium. The VC/Nf/3 modified glassy carbon electrode showed much higher catalytic performance, compared to VC/Nf/2 and VC/Nf/1 modified ones. The long term stability of the VC/Nf/3 catalyst in acidic medium was better than that of VC/Nf/2. It was found that the VC/Nf/1, VC/Nf/2 and VC/Nf/3 catalysts are nearly insensitive to the presence of methanol. In the presence of 1 M methanol in the electrolyte, the catalytic performances of 2- and 3-based catalysts were much better than that of the Pt-based one. Thus, it was shown that the VC/Nf/2-Pt and VC/Nf/3-Pt dual catalysts can be good alternatives to VC/Nf/Pt as cathode catalysts in direct methanol fuel cells. Moreover, in the absence of methanol, the mixing of 3 with Pt resulted in the enhancement of catalytic activity for OR, when compared to 3 and even Pt in the high overpotentials region.", 
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      "issue": "32", 
      "pages": "6368-6376", 
      "title": "DALTON TRANSACTIONS"
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    "publication_date": "2009-01-01", 
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    "title": "Electrocatalytic activity, methanol tolerance and stability of perfluoroalkyl-substituted mononuclear, and ball-type dinuclear cobalt phthalocyanines for oxygen reduction in acidic medium"
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