Samarium and Nitrogen Co‐Doped Bi₂WO₆ Photocatalysts: Synergistic Effect of Sm³⁺/Sm²⁺ Redox Centers and N‐Doped Level for Enhancing Visible‐Light Photocatalytic Activity

Abstract Samarium and nitrogen co‐doped Bi 2 WO 6 nanosheets were successfully synthesized by using a hydrothermal method. The crystal structures, morphology, elemental compositions, and optical properties of the prepared samples were investigated. The incorporation of samarium and nitrogen ions into Bi 2 WO 6 was proved by X‐ray diffraction, energy dispersive X‐ray spectroscopy, and X‐ray photoelectron spectroscopy. UV/Vis diffuse reflectance spectroscopy indicated that the samarium and nitrogen co‐doped Bi 2 WO 6 possessed strong visible‐light absorption. Remarkably, the samarium and nitrogen co‐doped Bi 2 WO 6 exhibited higher photocatalytic activity than single‐doped and pure Bi 2 WO 6 under visible‐light irradiation. Radical trapping experiments indicated that holes (h + ) and superoxide radicals ( . O 2 − ) were the main active species. The results of photoluminescence spectroscopy and photocurrent measurements demonstrated that the recombination rate of the photogenerated electrons and holes pairs was greatly depressed. The enhanced activity was attributed to the synergistic effect of the in‐built Sm 3+ /Sm 2+ redox pair centers and the N‐doped level. The mechanism of the excellent photocatalytic activity of Sm‐N‐Bi 2 WO 6 is also discussed.

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