Boosted Efficiency of Fe 2 O 3 for Photocatalytic CO 2 Reduction via Engineering Fe-O-Ti Bonding.

Visible light-driven photocatalytic CO ₂ reduction (CO ₂ RR) offers a sustainable and promising solution to environmental and energy challenges. However, the design of efficient photocatalysts is hindered by poor interface interactions in heterojunctions and a limited understanding of reaction kinetics. A modified Fe ₂ O ₃ photocatalyst, M-Fe ₂ O ₃ @MXene, is introduced featuring KH-550-modified M-Fe ₂ O ₃ hollow nanocubes coated with MXene, constructed via an electrostatic and Fe-O-Ti bonding self-assembly method. This design achieves an unprecedented CO production rate of 240 µmol g⁻¹ h⁻¹ among non-noble metal catalysts (8.6 folds vs Fe ₂ O ₃ ). The Fe-O-Ti sites enhance *COOH intermediate formation and CO production through higher electron deficiency of Fe ³⁺ and rapid charge transfer. This study offers new insights on the use of functional metal oxides and high-quality Mxene layers to design efficient metal oxide-based photocatalysts.
(© 2024 The Author(s). Advanced Science published by Wiley‐VCH GmbH.)