Hydrothermal Sm-doped tungsten oxide vertically plate-like array photoelectrode and its enhanced photoelectrocatalytic efficiency for degradation of organic dyes

摘要: Samarium doped tungsten oxide film was synthesized by a hydrothermal method with sodium tungstate as W precursor and samarium dopant. After annealing at 450 °C for 0.5 h, the morphology structural characterization of as-prepared films were determined scanning electron microscopy, X-ray diffraction high-resolution transmission microscope. For pure Sm-doped WO3 serving photoanodes, photoelectrocatalytic properties demonstrated degrading methyl orange methylene blue solution, showing that has faster rate than film. Photoelectrochemical investigated using linear sweep voltammetry, electrochemical impedance spectroscopy, Mott–Schottky incident photon to current conversion efficiency. achieves high photocurrent 1.50 mA cm−2 1.4 V versus. Ag/AgCl, which is 1.8 times (0.83 mA cm−2). Moreover, photogenerated hole injection efficiency improved retarding recombination interface electrode/electrolyte. The results indicate Sm2O3 formed excess doping led better photoelectrochemical activities film, suggesting Sm favorable strategy improve performance photoanode.