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Doping or Deposition of NiS on Cd 0.3 Zn 0.7 S Photocatalysts: Optimising Photocatalytic Hydrogen Evolution
Author(s) -
Markovskaya Dina V.,
Kozlova Ekaterina A.,
Cherepanova Svetlana V.,
Kolinko Pavel A.,
Gerasimov Eugeny Yu.,
Parmon Valentin N.
Publication year - 2017
Publication title -
chemphotochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.13
H-Index - 18
ISSN - 2367-0932
DOI - 10.1002/cptc.201700121
Subject(s) - photocatalysis , x ray photoelectron spectroscopy , high resolution transmission electron microscopy , materials science , catalysis , aqueous solution , diffuse reflectance infrared fourier transform , hydrogen , nuclear chemistry , spectroscopy , analytical chemistry (journal) , doping , transmission electron microscopy , inorganic chemistry , chemistry , nanotechnology , chemical engineering , organic chemistry , quantum mechanics , engineering , physics , optoelectronics
The photocatalytic properties of a Cd 0.3 Zn 0.7 S photocatalyst modified either by NiS doping or by supporting NiS on the catalyst surface were studied. The obtained samples were investigated by different characterization techniques, including X‐ray diffraction (XRD), UV/Vis diffuse reflectance spectroscopy (DRS), high‐resolution transmission electron microscopy (HRTEM), and X‐ray photoelectron spectroscopy (XPS). The photocatalytic activity was measured in hydrogen evolution from aqueous solutions of Na 2 S/Na 2 SO 3 under visible‐light irradiation ( λ =450 nm). Nickel modifications on the surface and in bulk led to improvements in the photocatalytic activity compared to the pristine sample. The samples modified in bulk underwent changes in composition and an increase of the catalytic activity during illumination was measured. In contrast, the rate of hydrogen photoproduction for the photocatalysts modified by NiS on the surface did not change appreciably. The highest photocatalytic activity values were 11.2 mmol h −1 g −1 and 12.8 mmol h −1 g −1 for the 0.3 % NiS/Cd 0.3 Zn 0.7 S and Ni 0.001 Cd 0.3 Zn 0.7 S 1.001 photocatalysts, respectively.