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Enhanced photocatalytic CO2 reduction performance of Bi2WO6 induced by Eu3+ doping
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DOI：10.1016/j.jre.2026.08.004.png)
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Abstract
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Defect engineering plays a crucial role in ameliorating photocatalytic performance of bismuth (Bi2WO6, BWO). In this study, europium-doped BWO catalyst was prepared by a hydrothermal method. Through relevant characterizations, it can be confirmed that Eu3+ has been successfully doped into the lattices of BWO. Due to the difference in ionic radius, introduction of Eu3+ can induce lattice distortion, thereby elevate specific surface area and enable formation of abundant oxygen vacancies (OVs), providing more active sites for photocatalytic reaction. OVs generated can efficiently capture photogenerated electrons, thereby significantly improving the separation of charges, inducing a negative shift in conduction band edge potential, consequently promoting thermodynamic driving force of photogenerated carriers. The optimized 7 mol%-BWO sample exhibits the highest carbon dioxide (CO2) reduction activity with a carbonic oxide (CO) generation rate of 6.02 μmol·(g/h), which is 2.75 times that over the reference BWO, and the samples also demonstrate excellent cycling stability. This study systematically elucidates the multiple regulatory mechanisms of rare earth ion doping on photocatalytic behavior of layered materials, providing a novel strategy for designing high-efficiency solar energy conversion catalysts.
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