Band structure engineering of carbon nitride hybrid photocatalysts for CO2 reduction in aqueous solutions

Through the co-polymerisation of dicyandiamide and barbituric acid precursors, a series of visible light active carbon nitride photocatalysts has been prepared and characterized, and their photocatalytic activity has been evaluated. Structural and electronic characterisation has enabled variations i...

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Bibliographic Details
Published in:Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2023-08, Vol.11 (34), p.18356-18364
Main Authors: Piercy, Verity L, Neri, Gaia, Manning, Troy D, Pugliese, Andrea, Blanc, Frédéric, Palgrave, Robert G, Cowan, Alexander J, Rosseinsky, Matthew J
Format: Article
Language:English
Subjects:
Activated carbon
Aqueous solutions
Band structure of solids
Carbon dioxide
Carbon nitride
Catalysts
Catalytic activity
Copolymerization
Hybrid systems
Photocatalysis
Photocatalysts
Porphyrins
Reduction
Structural analysis
Water splitting
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Summary:Through the co-polymerisation of dicyandiamide and barbituric acid precursors, a series of visible light active carbon nitride photocatalysts has been prepared and characterized, and their photocatalytic activity has been evaluated. Structural and electronic characterisation has enabled variations in observed activity towards water splitting and CO2 reduction to be understood, both in the presence and absence of the iron porphyrin co-catalyst Feiii tetra(4-carboxylphenyl)porphyrin (FeTCPP). A combination of the most active carbon nitride catalyst using 5 wt% barbituric acid and FeTCPP provides a hybrid system where the alignment of band structure with appropriate reduction potentials and enhanced carrier lifetimes is capable of CO2 reduction in an aqueous solution with >60% selectivity for CO production. This study is one of only a few that achieves selective CO2 reduction using a hybrid molecular catalyst-carbon nitride photocatalyst in aqueous solution.
ISSN:2050-7488
2050-7496
DOI:10.1039/d3ta02872k