Photocatalytic CO2 Reduction by Re(I) Polypyridyl Complexes Immobilized on Niobates Nanoscrolls
- authored by
- L.A. Faustino, B.L. Souza, B.N. Nunes, A.-T. Duong, Fabian Sieland, Detlef W. Bahnemann, A.O.T. Patrocinio
- Abstract
Immobilization of Re(I) CO
2 reduction photocatalysts on metal oxide surfaces is an interesting approach to improve their stability and recyclability. In this work, we describe the photocatalytic activity of two Re(I) complexes (fac-[Re(NN)(CO)
3(Cl)], NN = 4,4'-dicarboxylic acid-2,2'-bipyridine, 1, or 5,6-dione-1,10-phenantroline, 2) on the surface of hexaniobate nanoscrolls. After adsorption, the turnover number for CO production (TON
CO) in DMF/TEOA of 1 was increased from 9 to 58, which is 20% higher than that observed on TiO
2, being among the highest reported values for a Re(I)-based photocatalyst under visible light irradiation without any sensitizer. The complex 2 is inactive in solution under visible-light irradiation, but it has a TON
CO of 35 when immobilized on hexaniobate nanoscrolls. Transient absorption spectroscopy studies reveal that the slow back-electron transfer and the higher reducing power of the hexaniobate conduction-band electrons play a major role for the photocatalytic process. The results provide new insights concerning the role of the metal oxide substrate on Re(I)-based molecular systems for CO
2 reduction.
- Organisation(s)
-
Institute of Technical Chemistry
- External Organisation(s)
-
Universidade Federal de Uberlandia
- Type
- Article
- Journal
- ACS Sustainable Chemistry & Engineering
- Volume
- 6
- Pages
- 6073–6083
- No. of pages
- 11
- ISSN
- 2168-0485
- Publication date
- 07.05.2018
- Publication status
- Published
- Peer reviewed
- Yes
- ASJC Scopus subject areas
- General Chemistry, Environmental Chemistry, General Chemical Engineering, Renewable Energy, Sustainability and the Environment
- Sustainable Development Goals
- SDG 7 - Affordable and Clean Energy
- Electronic version(s)
-
https://doi.org/10.1021/acssuschemeng.7b04713 (Access:
Closed)
