Boosting CO₂ Photoreduction Efficiency of Carbon Nitride via S-scheme g-C₃N₄/Fe₂TiO₅ Heterojunction

Autor(es)

dos Santos, Gustavo ; Tian, Liang ; Goncalves, Renato ; Garcia, Hermenegildo ; Rossi, Liane

• Tipo de documento: Artigo Científico
• Fonte: ADVANCED FUNCTIONAL MATERIALS; v. N/A, p. 15-pg., 2025-02-19.

Resumo

Photocatalysis has emerged as an alternative to high energy-demanding CO2 reduction reactions. Among the widely studied photocatalysts, g-C3N4 stands out due to its composition based on earth-abundant elements, its ability to absorb visible light, and its suitable band structure. In this study, a photocatalyst based on an S-scheme heterojunction formed by g-C3N4 and nanosized Fe2TiO5 is successfully prepared via simple hydrothermal assembly of both pre-synthesized semiconductors. Modifications induced on g-C3N4 during the heterojunction preparation play a crucial role in the efficiency of the CO2 photoreduction reaction. Under simulated sunlight irradiation, the g-C3N4/Fe2TiO5 heterojunction exhibits higher photocatalytic performance than the pristine materials for both CO2 reduction to produce CO and CH4, and H2O reduction reaction, producing H-2. The results obtained correspond to a 1.5-fold improvement compared to pristine g-C3N4. When [Ru(bpy)(3)](2+) is applied as a sensitizer, the visible light (>380 nm) activity of the photocatalytic system is restored, showing lower activity but higher selectivity toward CO and H-2 production, a route to renewable syngas. (AU)

• Processo FAPESP: 20/15230-5 - Centro de Pesquisa e Inovação de Gases de Efeito Estufa - RCG2I
• Beneficiário: Julio Romano Meneghini
• Modalidade de apoio: Auxílio à Pesquisa - Programa Centros de Pesquisa em Engenharia
• Processo FAPESP: 14/50279-4 - Brasil Research Centre for Gas Innovation
• Beneficiário: Julio Romano Meneghini
• Modalidade de apoio: Auxílio à Pesquisa - Programa Centros de Pesquisa em Engenharia
• Processo FAPESP: 21/00675-4 - Arquitetura de materiais para armazenamento de energia eletroquímica e catálise
• Beneficiário: Roberto Manuel Torresi
• Modalidade de apoio: Auxílio à Pesquisa - Temático