Electrochemical CO2 and CO reduction on metal-functionalized porphyrin-like graphene

Vladimir Tripkovic, Marco Vanin, Mohammedreza Karamad, Mårten Björketun, Karsten W. Jacobsen, Kristian S. Thygesen, Jan Rossmeisl

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Porphyrin-like metal-functionalized graphene structures have been investigated as possible catalysts for CO2 and CO reduction to methane or methanol. The late transition metals (Cu, Ag, Au, Ni, Pd, Pt, Co, Rh, Ir, Fe, Ru, Os) and some p (B, Al, Ga) and s (Mg) metals comprised the center of the porphyrin ring. A clear difference in catalytic properties compared to extended metal surfaces was observed owing to a different electronic nature of the active site. The preference to bind hydrogen, however, becomes a major obstacle in the reaction path. A possible solution to this problem is to reduce CO instead of CO2. Volcano plots were constructed on the basis of scaling relations of reaction intermediates, and from these plots the reaction steps with the highest overpotentials were deduced. The Rh-porphyrin-like functionalized graphene was identified as the most active catalyst for producing methanol from CO, featuring an overpotential of 0.22 V. Additionally, we have also examined the hydrogen evolution and oxidation reaction, and in their case, too, Rh-porphyrin turned out to be the best catalyst with an overpotential of 0.15 V. © 2013 American Chemical Society.
Original languageEnglish
JournalThe Journal of Physical Chemistry Part C
Volume117
Issue number18
Pages (from-to)9187-9195
ISSN1932-7447
DOIs
Publication statusPublished - 2013

Keywords

  • Catalysts
  • Graphene
  • Hydrogen
  • Metals
  • Methane
  • Methanol
  • Porphyrins
  • Reduction
  • Rhodium
  • Ruthenium
  • Carbon dioxide

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