Photocatalytic CO₂ Reduction by Re(I) Polypyridyl Complexes Immobilized on Niobates Nanoscrolls

verfasst von

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.

Organisationseinheit(en)

Institut für Technische Chemie

Externe Organisation(en)

Universidade Federal de Uberlandia

Typ

Artikel

Journal

ACS Sustainable Chemistry & Engineering

Band

6

Seiten

6073–6083

Anzahl der Seiten

11

ISSN

2168-0485

Publikationsdatum

07.05.2018

Publikationsstatus

Veröffentlicht

Peer-reviewed

Ja

ASJC Scopus Sachgebiete

Allgemeine Chemie, Umweltchemie, Allgemeine chemische Verfahrenstechnik, Erneuerbare Energien, Nachhaltigkeit und Umwelt

Ziele für nachhaltige Entwicklung

SDG 7 – Erschwingliche und saubere Energie

Elektronische Version(en)

https://doi.org/10.1021/acssuschemeng.7b04713 (Zugang: Geschlossen)