Selective Photocatalytic Reduction of CO2-to-CO in Water using a Polymeric Carbon Nitride Quantum Dot/Fe-Porphyrin Hybrid Assembly
Journal article, 2022

Visible light-driven conversion of CO2 into more value-added products is a promising technology not only for diminution of CO2 emission but also for solar energy storage in the form of chemical energy. However, photocatalytic materials that can efficiently and selectively reduce CO2-to-CO in a fully aqueous solution typically involve precious metals that limit their suitability for large scale applications. Herein, a novel photocatalytic assembly is reported, consisting of polymeric carbon nitride quantum dots (CNQDs) as the visible light absorber and a Fe-porphyrin complex (Fe-p-TMA) as the catalyst for CO2-to-CO conversion. Both components were carefully selected to allow for excellent solubility in water as well as improved electronic communication through complementary electrostatic and π-π interactions. This CNQD ⋅ [Fe-p-TMA] hybrid assembly, at the optimized molar ratio, can produce CO with a turnover number (TON) exceeding 105 and selectivity ∼96 % after 10 hours of visible light irradiation (400–700 nm). It is postulated that the enhanced CO2-to-CO transformation performance is due to the convenience of a more direct charge transfer (CT) pathway between the CNQDs and [Fe-p-TMA] motif.

CO reduction 2

photocatalysis

Fe-porphyrin

polymeric carbon nitride

solar-to-fuels

Author

Liam Mistry

Chalmers, Chemistry and Chemical Engineering, Chemistry and Biochemistry

Quang Long Le

Chalmers, Chemistry and Chemical Engineering, Chemistry and Biochemistry

Gerard Masdeu Gámez

Pharmaceutical Technology

Wilma Björkman

Student at Chalmers

Hanna Härelind

Chalmers, Chemistry and Chemical Engineering

Maria Abrahamsson

Chalmers, Chemistry and Chemical Engineering, Chemistry and Biochemistry

ChemCatChem

1867-3880 (ISSN) 1867-3899 (eISSN)

Vol. 14 24 e202200897

Subject Categories

Chemical Process Engineering

Other Physics Topics

Other Chemistry Topics

DOI

10.1002/cctc.202200897

More information

Latest update

3/7/2024 9