Platinum-macrocycle co-catalysts for the electrochemical oxidation of methanol

J. S. Bett, H. R. Kunz, A. J. Aldykiewicz, J. M. Fenton, W. F. Bailey, D. V. McGrath

Research output: Contribution to journalArticle

65 Scopus citations

Abstract

Metal phthalocyanines (Fe, Co, Ni and Sn) and ruthenium tetramethylcyclam 14 and 15 were studied as cocatalysts for methanol oxidation on platinum supported catalysts. The formation of well defined monolayers of the adsorbed complexes was inferred from the Langmuirian form of the adsorption isotherms in solutions of macrocycles. The coverage at monolayer levels was low, e.g. 1.25 to 2.25 × 1013 molecules cm-2 or 400 to 800 Å2 molecule-1. Enhancement for the methanol oxidation reaction was observed for Pt co-catalyzed with Sn phthalocyanine and Ru tetramethylcyclam. Ru tetramethylcyclam showed an enhancement for methanol oxidation on a per unit weight basis over pure Pt, approaching the activity of PtRu at lower potentials. Increasing the size of the nitrogen ring from 14 to 15 resulted in a lower redox potential and increase in the activity of methanol oxidation. The activity of Pt co-catalyzed with Ru TMC 15 decreased with time suggesting that the macrocycle was desorbing from the supported catalyst surface.

Original languageEnglish (US)
Pages (from-to)3645-3655
Number of pages11
JournalElectrochimica Acta
Volume43
Issue number24
DOIs
StatePublished - Aug 21 1998
Externally publishedYes

Keywords

  • Methanol oxidation
  • Platinum
  • Ruthenium tetramethylcyclams

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry

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