In situ fabrication of TiO2 nanoparticles/2D porphyrin metal-organic frameworks for enhancing the photoreduction of CO2 to CO
Xu X. Labidi A. Luo T. Gao T. Nuraje N. Zvereva I. Wang C.
7 March 2025Royal Society of Chemistry
Journal of Materials Chemistry A
2025#13Issue 1611389 - 11395 pp.
Developing photocatalysts for CO2 reduction with high efficiency and selectivity in a photocatalytic system remains urgent yet challenging. Herein, we report the highly selective photocatalyzed reduction of CO2 to CO by in situ grown ultrafine TiO2 nanoparticles on an ultrathin two-dimensional (2D) porphyrin metal-organic framework (Al-MOF@TiO2). Al-MOF and TiO2 nanoparticles are connected by 4,4-bipyridine (BPY): the nitrogen atom of BPY coordinates with the metal aluminum in Al-MOF and with TiO2 to form the Ti-O-N bond. The ultrathin 2D Al-MOF improved the dispersibility and stability of TiO2 under prolonged light illumination. Additionally, the interfacial Ti-O-N covalent bond promoted charge carrier transfer and separation along with the rapid migration of charge carriers to the surface for the selective reduction of CO2 to CO. The hybrid photocatalyst demonstrated excellent capability in reducing CO2 to CO with a selectivity of 94.1%, producing 1901 μmol g−1 of CO, which is eight times higher than that obtained using pure Al-MOF. Furthermore, the Al-MOF@TiO2 photocatalyst exhibited superior stability, maintaining its structural integrity in an aqueous reaction system. This work provides an effective strategy for improving the stability and charge separation property of metallic oxide-modified photocatalysts for efficient photocatalytic CO2 reduction.
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School of Environmental Science and Engineering, Shaanxi University of Science and Technology, Xian, 710021, China
Department of Chemical & Materials Engineering, School of Engineering & Digital Science, Nazarbayev University, Astana, Kazakhstan
Renewable Energy Laboratory, National Laboratory Astana, Nazarbayev University, Astana, Kazakhstan
Institute of Chemistry, Department of Chemical Thermodynamics and Kinetics, Center for Thermal Analysis and Calorimetry, St. Petersburg State University, Universitetskiy Pr. 26, Peterhof, 198504, Russian Federation
School of Environmental Science and Engineering
Department of Chemical & Materials Engineering
Renewable Energy Laboratory
Institute of Chemistry
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