DFT and Empirical Considerations on Electrocatalytic Water/Carbon Dioxide Reduction by CoTMPyP in Neutral Aqueous Solutions**

Yair Bochlin, Yeshayahu Ben-Eliyahu, Yanir Kadosh, Sebastian Kozuch, Israel Zilbermann, Eli Korin, Armand Bettelheim

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

A combined experimental and density functional theory (DFT) investigation was employed in order to examine the mechanism of electrochemical CO2 reduction and H2 formation from water reduction in neutral aqueous solutions. A water soluble cobalt porphyrin, cobalt [5,10,15,20-(tetra-N-methyl-4-pyridyl)porphyrin], (CoTMPyP), was used as catalyst. The possible attachment of different axial ligands as well as their effect on the electrocatalytic cycles were examined. A cobalt porphyrin hydride is a key intermediate which is generated after the initial reduction of the catalyst. The hydride is involved in the formation of H2 and formate and acts as an indirect proton source for the formation of CO in these H+-starving conditions. The experimental results are in agreement with the computations and give new insights into electrocatalytic mechanisms involving water soluble metalloporphyrins. We conclude that in addition to the porphyrin's structure and metal ion center, the electrolyte surroundings play a key role in dictating the products of CO2/H2O reduction.

Original languageEnglish
Pages (from-to)2644-2650
Number of pages7
JournalChemPhysChem
Volume21
Issue number24
DOIs
StatePublished - 14 Dec 2020

Keywords

  • carbon dioxide reduction
  • cobalt porphyrins
  • density functional calculations
  • electrocatalysis
  • hydrogen evolution reaction

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Physical and Theoretical Chemistry

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