Photocatalytic CO2 reduction with aminoanthraquinone organic dyes

Abstract

Summary

The photochemical reduction of CO₂ to CO was shown using the iron complex xx in combination with the aminoanthraquinone photosensitizers xx-xx. Turnover numbers (TONs) of up to 21616 and a selectivity of >99.9% for CO were reached in DMF after 48 h of irradiation. The experiments were conducted under visible-light irradiation (λ > 400 nm) with BIH (see section SEDs below) as sacrificial electron donor.

Advances and special progress

The authors present an efficient photocatalytic system with naturally abundant photosensitizers and without rare metals in which both the photosensitizer and catalyst show a high activity.

Content of the published article in detail

The article contains results of a detailed study on the influence of additional photosensitizers on the catalytic performance of the xx catalyst xx for the reduction of CO₂ to CO. The catalytic system performs best (referring to the TON of CO production) for the combination of the above mentioned catalyst with the xx complex xx as the photosensitizer in the presence of xx as sacrificial electron donors.

Investigation

	cat	cat conc [µM]	PS	PS conc [mM]	e-D	e-D conc [M]	solvent A	λexc [nm]	.	TON CO	.	.
1.	Fe(DHPP)Cl	0.0006	Molecule:100930	0.02	BIH	0.06	DMF	>400		2395
2.	Fe(DHPP)Cl	0.0006	Molecule:100958	0.02	BIH	0.06	DMF	>400		2738
3.	Fe(DHPP)Cl	0.0006	Molecule:100959	0.02	BIH	0.06	DMF	>400		3551
4.	Fe(DHPP)Cl	0.0006	Molecule:100931	0.02	BIH	0.06	DMF	>400		8360
5.	Fe(DHPP)Cl	0.0006	Molecule:100932	0.02	BIH	0.06	DMF	>400		21616
6.	Fe(DHPP)Cl	0.0006	Molecule:100933	0.02	BIH	0.06	DMF	>400		907

Experiment-Name: Photocatalytic reduction of CO2 with different photosensitizersExport

Additives

In this study, the addition of Hg(0) was tested.