title: Enhanced visible light photocatalytic activity of Gd-doped BiFeO3 nanoparticles and mechanism insight.
abstract: To investigate the effect of Gd doping on photocatalytic activity of BiFeO3 (BFO), Gd-doped BFO nanoparticles containing different Gd doping contents (Bi(1-x)GdxFeO3, x = 0.00, 0.01, 0.03, 0.05) were synthesized using a facile sol-gel route. The obtained products were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectra, and ultraviolet-visible diffuse reflectance spectroscopy, and their photocatalytic activities were evaluated by photocatalytic decomposition of Rhodamine B in aqueous solution under visible light irradiation. It was found that the Gd doping content could significantly affect the photocatalytic activity of as-prepared Gd-doped BFO, and the photocatalytic activity increased with increasing the Gd doping content up to the optimal value and then decreased with further enhancing Gd doping content. To elucidate the enhanced photocatalytic mechanism of Gd-doped BFO, the trapping experiments, photoluminescence, photocurrent and electrochemical impedance measurements were performed. On the basis of these experimental results, the enhanced photocatalytic activities of Gd-doped BFO could be ascribed to the increased optical absorption, the efficient separation and migration of photogenerated charge carriers as well as the decreased recombination probability of electron-hole pairs derived from the Gd doping effect. Meanwhile, the possible photocatalytic mechanism of Gd-doped BFO was critically discussed.
authors.affiliation: College of Materials Science and Engineering, China Jiliang University, Hangzhou 310018, Zhejiang, P.R. China.
authors.forename: Ning
authors.initials: N
authors.lastname: Zhang
authors.affiliation: College of Materials Science and Engineering, China Jiliang University, Hangzhou 310018, Zhejiang, P.R. China.
authors.forename: Da
authors.initials: D
authors.lastname: Chen
authors.affiliation: College of Materials Science and Engineering, China Jiliang University, Hangzhou 310018, Zhejiang, P.R. China.
authors.forename: Feng
authors.initials: F
authors.lastname: Niu
authors.affiliation: College of Materials Science and Engineering, China Jiliang University, Hangzhou 310018, Zhejiang, P.R. China.
authors.forename: Sen
authors.initials: S
authors.lastname: Wang
authors.affiliation: College of Materials Science and Engineering, China Jiliang University, Hangzhou 310018, Zhejiang, P.R. China.
authors.forename: Laishun
authors.initials: L
authors.lastname: Qin
authors.affiliation: College of Materials Science and Engineering, China Jiliang University, Hangzhou 310018, Zhejiang, P.R. China.
authors.forename: Yuexiang
authors.initials: Y
authors.lastname: Huang