1 Ocak 2009 Dergi makalesi Açık Erişim

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

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  <identifier identifierType="URL">https://aperta.ulakbim.gov.tr/record/39629</identifier>
  <creators>
    <creator>
      <creatorName>Koc, I.</creatorName>
      <givenName>I.</givenName>
      <familyName>Koc</familyName>
      <affiliation>Marmara Univ, Dept Chem, TR-34722 Goztepe, Turkey</affiliation>
    </creator>
    <creator>
      <creatorName>Oezer, M.</creatorName>
      <givenName>M.</givenName>
      <familyName>Oezer</familyName>
      <affiliation>Marmara Univ, Dept Chem, TR-34722 Goztepe, Turkey</affiliation>
    </creator>
    <creator>
      <creatorName>Oezkaya, A. R.</creatorName>
      <givenName>A. R.</givenName>
      <familyName>Oezkaya</familyName>
      <affiliation>Marmara Univ, Dept Chem, TR-34722 Goztepe, Turkey</affiliation>
    </creator>
    <creator>
      <creatorName>Bekaroglu, O.</creatorName>
      <givenName>O.</givenName>
      <familyName>Bekaroglu</familyName>
      <affiliation>Tech Univ Istanbul, Dept Chem, TR-34469 Maslak, Turkey</affiliation>
    </creator>
  </creators>
  <titles>
    <title>Electrocatalytic Activity, Methanol Tolerance And Stability Of Perfluoroalkyl-Substituted Mononuclear, And Ball-Type Dinuclear Cobalt Phthalocyanines For Oxygen Reduction In Acidic Medium</title>
  </titles>
  <publisher>Aperta</publisher>
  <publicationYear>2009</publicationYear>
  <dates>
    <date dateType="Issued">2009-01-01</date>
  </dates>
  <resourceType resourceTypeGeneral="Text">Journal article</resourceType>
  <alternateIdentifiers>
    <alternateIdentifier alternateIdentifierType="url">https://aperta.ulakbim.gov.tr/record/39629</alternateIdentifier>
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  <relatedIdentifiers>
    <relatedIdentifier relatedIdentifierType="DOI" relationType="IsIdenticalTo">10.1039/b905614a</relatedIdentifier>
  </relatedIdentifiers>
  <rightsList>
    <rights rightsURI="http://www.opendefinition.org/licenses/cc-by">Creative Commons Attribution</rights>
    <rights rightsURI="info:eu-repo/semantics/openAccess">Open Access</rights>
  </rightsList>
  <descriptions>
    <description descriptionType="Abstract">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.</description>
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