Light-driven reduction of CO₂ to CO in water with a cobalt molecular catalyst and an organic sensitizer

Pui Yu HO, Shun-Cheung CHENG, Fei YU, Yau Yuen YEUNG, Wen-Xiu NI, Chi-Chiu KO, Chi Fai LEUNG, Tai-Chu LAU, Marc ROBERT

Research output: Contribution to journalArticlespeer-review

5 Citations (Scopus)

Abstract

We report an efficient visible light-driven CO₂ reduction system that functions in water and without any noble metal nor rare materials. Using the cobalt complex [Co(qpy)(OH₂)₂]²⁺ (1, qpy = 2,2′:6′,2″:6″,2‴-quaterpyridine) as a catalyst, an organic triazatriangulenium (TATA+) salt as the photosensitizer (PS), BIH + TEOA (BIH = 1,3-dimethyl-2-phenyl-2,3-dihydro-1H-benzo[d]imidazole and TEOA = triethanolamine) as the sacrificial reductant (SD), CO and formate were first produced with a total TON >3700 upon irradiation in CO₂-saturated CH₃CN solution with visible light. Upon the addition of a weak Brönsted acid (water), catalysis was enhanced and directed toward CO production (19,000 TON, 93% selectivity). The photocatalytic system was further shown to function in pure water as a solvent. High metrics with a TON for CO of 2600 and 94% selectivity were obtained using TEA (triethylamine) as the SD. Copyright © 2023 American Chemical Society.
Original languageEnglish
Pages (from-to)5979-5985
JournalACS Catalysis
Volume13
Issue number9
Early online dateApr 2023
DOIs
Publication statusPublished - May 2023

Citation

Ho, P.-Y., Cheng, S.-C., Yu, F., Yeung, Y.-Y., Ni, W.-X., Ko, C.-C., . . . Robert, M. (2023). Light-driven reduction of CO₂ to CO in water with a cobalt molecular catalyst and an organic sensitizer. ACS Catalysis, 13, 5979-5985. doi: 10.1021/acscatal.3c00036

Keywords

  • Photocatalysis
  • CO₂ reduction
  • Cobalt complex
  • Organic photosensitizer
  • Visible light
  • Carbon monoxide
  • Formic acid

Fingerprint

Dive into the research topics of 'Light-driven reduction of CO₂ to CO in water with a cobalt molecular catalyst and an organic sensitizer'. Together they form a unique fingerprint.