Open AccessHydrothermal synthesis of single-crystal Cr-doped SrTiO3 for efficient visible-light responsive photocatalytic hydrogen evolution
Author(s) -
Daixun Jiang,
Xun Sun,
Xilu Wu,
Liang Shi,
Fanglin Du
Publication year - 2020
Publication title -
materials research express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.383
H-Index - 35
ISSN - 2053-1591
DOI - 10.1088/2053-1591/ab660d
Subject(s) - x ray photoelectron spectroscopy , materials science , photocatalysis , visible spectrum , raman spectroscopy , photocurrent , dielectric spectroscopy , scanning electron microscope , hydrothermal circulation , analytical chemistry (journal) , spectroscopy , absorption spectroscopy , hydrothermal synthesis , chemical engineering , electrochemistry , optoelectronics , optics , chemistry , electrode , biochemistry , physics , composite material , chromatography , quantum mechanics , engineering , catalysis
Visible-light-driven Cr-doped SrTiO 3 nanocubes were successfully synthesized by hydrothermal method in alkaline KOH conditions. X-ray diffraction spectroscopy (XRD), Raman spectra, x-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM) and scanning electron microscopy (SEM) were used to characterize the samples, and the Cr-doped SrTiO 3 possess cubic morphology with about 30–50 nm in size, and single-crystal feature. In addition, the Cr-doped SrTiO 3 extended light-harvesting properties to visible-light region which was testified by UV–vis absorption spectra, and excellent charge transfer and separation efficiency were approved by photo fluorescence spectra (PL), electrochemical impedance spectroscopy (EIS) and photocurrent response measurements. Among the synthesized photocatalysts, SrTiO 3 nanocubes doped with 2% Cr by molar ratio exhibits the highest photocatalytic activity, achieving 11.66 μ mol of H 2 evolution during 5 h visible-light irradiation. This study provides a facile and effective way to enhance the performance of SrTiO 3 -based photocatalysts.