Molecular deposition of a macrocyclic cobalt catalyst on TiO2 nanoparticles

Chao Liu, Tong Jin, Michael E. Louis, Sebastian A. Pantovich, Sarah L. Skraba-Joiner, Tijana Rajh, Gonghu Li

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

Hybrid photocatalysts consisting of molecular catalysts and solid-state surfaces have demonstrated great potential as robust and efficient systems in solar fuel production. Based on our prior work, we synthesized hybrid photocatalysts by depositing a macrocyclic Co(III) complex on three different TiO2 nanomaterials via a microwave method. The hybrid photocatalysts were tested in CO2 reduction and were thoroughly characterized with spectroscopic (UV–vis, FTIR and EPR) and microscopic (TEM) techniques. The presence of terminal OH groups on TiO2 surfaces was essential for the molecular deposition of catalytically active Co(III) sites. On a TiO2 material without such terminal OH groups, the Co(III) complex formed amorphous aggregates, which hindered interfacial electron transfer from photoactivated TiO2 to the surface molecular complex. EPR studies further revealed important information regarding the coordination geometry and interaction with CO2 of surface cobalt sites in the hybrid photocatalysts.

Original languageEnglish (US)
Pages (from-to)293-299
Number of pages7
JournalJournal of Molecular Catalysis A: Chemical
Volume423
DOIs
StatePublished - Nov 1 2016
Externally publishedYes

Keywords

  • CO reduction
  • Cobalt cyclam
  • Hybrid photocatalyst
  • Titanium dioxide

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology
  • Physical and Theoretical Chemistry

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