Cobalt porphyrin immobilized on the TiO2 nanotube electrode for CO2 electroreduction in aqueous solution

Shengshen Gu, Aleksei N. Marianov, Yuxiang Zhu, Yijiao Jiang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

Herein we report CO2 electrochemical reduction reaction (CO2ERR) on the cobalt tetraphenylporphyrin (CoTPP) modified TiO2 nanotube (TNT) electrode. It was found the axial coordination of drop-casting solvent to CoTPP and the porphyrin structure are the major factors that have significant effects on the catalytic performance of the electrode. As confirmed by spectrophotometric titration, pyridine has a stronger coordination bond to CoTPP than DMF and THF thus leading to the highest efficiency among the drop-casting solvents tested in the study. Based on the spectrophotometric analysis, possible coordination mechanism between drop-casting solvents and CoTPP is put forward. On the other hand, introduction of –COOMe substituents in phenyl rings of CoTPP weakens the coordination bond between pyridine and CoTPP as clearly evidenced by deuterium NMR spectra, resulting in a detrimental effect on CO2ERR. Therefore, the manipulation of the coordination environment around the metal center of immobilized catalyst is crucial in designing an efficient electrocatalytic system.

Original languageEnglish
Pages (from-to)219-227
Number of pages9
JournalJournal of Energy Chemistry
Volume55
DOIs
Publication statusPublished - Apr 2021

Keywords

  • CO₂ electroreduction
  • Co porphyrins
  • Immobilization
  • Drop-casting solvent
  • Axial coordination

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