Synthesis, Photocatalytic and Electrocatalytic Activities of Wormlike GdFeO<sub>3</sub> Nanoparticles by a Glycol-Assisted Sol–Gel Process

Abstract

Wormlike GdFeO<sub>3</sub> (GFO) nanoparticles were synthesized by a glycol-assisted sol–gel rapid calcination process. The as-synthesized GdFeO<sub>3</sub> was characterized by X-ray diffraction, transmission electron microscopy, differential scanning calorimeter and thermogravimetric analysis, Fourier transformed infrared spectroscopy, and UV–vis absorption spectroscopy. The visible-light-responsive photocatalytic activity of GdFeO<sub>3</sub> nanoparticles was evaluated by the photodegradation of Rhodamine B under visible light. The synergism of semiconductor-photocatalyzed oxidation and heterogeneous photo-Fenton-like reaction can markedly promote the photodegradation with a booming catalytic activity (<i>k</i> = 1.2814 h<sup>–1</sup>). Compared with the bulk, the catalytic activity of the GFO–H<sub>2</sub>O<sub>2</sub> system was improved about 80 times. Meanwhile, the glass carbon electrode decorated with the resulting nanoparticles was used to examine the electrocatalytic behavior for <i>p</i>-nitrophenol reduction in a basic solution. The results show the obtained GdFeO<sub>3</sub> nanoparticles with excellent photocatalytic and electrocatalytic activities

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