Molecular engineering optimized carbon nitride photocatalyst for CO2 reduction to solar fuels

The structural alteration of carbon nitride (CN) for photocatalytic CO2 reduction is a promising research topic in the environmental and energy sectors. This work discusses the fabrication of photocatalyst through a heterojunction architecture obtained from the molecular engineering of electron-rich organic monomer 2,6-pyridinedicarboxylic acid (PDA) with CN precursor (CN/PDAx). The successful integration of PDA in the structure of CN served as a charge inducting entity to enhance charge separation and photocatalytic CO2 reduction under visible light (l = 420 nm). The DFT results indicated that the upshift in the HOMO level of CN after integration of PDA in its framework was the most lawful for the charge separation and for obtaining a high reduction potential. As-synthesized photocatalysts were demon-strated for various integral analysises and after evaluating the process of photocatalytic CO2 reduction under visible light region (l = 420 nm). The optimized sample CN/PDA10 has the most excellent pho-tocatalytic activity producing 85.4 mmol/h of CO and 21.3 mmol/h of H2, achieving a 7.5-fold enhanced catalytic efficiency as compared to pure CN. We hope that this work will attract more attention to synthesizing efficient photocatalysts for energy production and environmental remediation.(c) 2022 Vietnam National University, Hanoi. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

Automated summary

This study discusses the fabrication of a photocatalyst for photocatalytic CO2 reduction by molecular engineering of an electron-rich organic monomer 2,6-pyridinedicarboxylic acid (PDA) with a carbon nitride (CN) precursor. The integration of PDA in the CN structure enhances charge separation and achieves a high reduction potential for efficient CO2 reduction under visible light. The optimized sample CN/PDA10 exhibits excellent photocatalytic activity with a 7.5-fold enhanced catalytic efficiency compared to pure CN.