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Article Abstract
This study presents a facile strategy for synthesizing in situ N-doped FeO from iron nitride to tune its band structure for photocatalytic applications. XRD analysis confirms the structural formation α-FeO, while XPS analysis verifies nitrogen incorporation of 8.87% and 5.52% in N-doped FeO obtained by oxidizing iron nitride at 450 °C and 550 °C, corresponding to high-doped and low-doped FeO (HD-FO and LD-FO) systems. FESEM and BET analysis showed that N-doping influenced particle aggregation, surface area, and porosity, with bare FeO (FO) exhibiting the highest surface area (43.9 m/g), followed by HD-FO (34.39 m/g) and LD-FO (25.79 m/g). UV-vis and valence band XPSs revealed bandgap narrowing from 2.80 eV (FO) to 2.71 eV (LD-FO) and 2.53 eV (HD-FO), improving visible light absorption. Mott-Schottky plots showed more negative conduction band potentials for LD-FO (-0.46 eV) and HD-FO (-0.54 eV compared to FO (-0.39 eV), indicating enhanced electron transfer properties in the systems. Photocatalytic RhB degradation under sunlight achieved ∼97%, 90%, and 87%, and H production rates of 839.6, 749.4, and 656.9 µmol g h for LD-FO, HD-FO, and FO, respectively. The results highlight the efficacy of iron nitride as a precursor for the in situ doping of N in FeO for efficient photocatalytic applications.
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