SnS-AuPd thin films for hydrogen production under solar light simulation

[Display omitted] •SnS thin films deposited by SILAR were able to produce H2 under simulated sunlight.•AuPd favors the charge transfer and decrease the electron-hole pair recombination in SnS films.•AuPd as co-catalyst enhances the H2 production of SnS thin films. In this work, SnS films were obtain...

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Published in:Journal of photochemistry and photobiology. A, Chemistry. Chemistry., 2018-06, Vol.361, p.19-24
Main Authors: López-Martínez, Sergio D., Juárez-Ramírez, Isaías, Torres-Martínez, Leticia M., Babar, Pravin, Lokhande, Abhishek, Kim, Jin Hyeok
Format: Article
Language:English
Subjects:
AuPd co-catalysts
Band gap
Catalysis
Catalysts
Catalytic activity
Charge transfer
Crystal structure
Emission analysis
Emission spectra
Energy gap
Hydrogen
Hydrogen production
Irradiation
Photocatalysis
Photoluminescence
Photons
Physical vapor deposition
Recombination
Scanning electron microscopy
Simulation
SnS
Substrates
Thin films
X-ray diffraction
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Summary:[Display omitted] •SnS thin films deposited by SILAR were able to produce H2 under simulated sunlight.•AuPd favors the charge transfer and decrease the electron-hole pair recombination in SnS films.•AuPd as co-catalyst enhances the H2 production of SnS thin films. In this work, SnS films were obtained by the SILAR method at 25 and 50 cycles. These films were used by the first time in the photocatalysis process to produce H2 under simulated sunlight. Additionally, AuPd was deposited by physical vapor deposition method on SnS films, which served as co-catalyst to increase the photocatalytic activity of the films. Characterization was done by X-ray diffraction (XRD), where it was found that SnS crystallizes in an orthorhombic crystal structure. By scanning electron microscopy (SEM) it was appreciated a homogeneous distribution in SnS 25 cycles film, while SnS 50 cycles film showed a greater density of particles deposited on the substrate. Band gap energy (UV-vis) for SnS 25 cycles and SnS 50 cycles films were close to 2.0 and 1.25 eV, respectively. Photoluminescence (PL) analysis showed that the emission spectra intensity of films decreases due to the presence of co-catalyst because of the lower electron-hole pair recombination. Both, SnS 25 cycles and SnS 50 cycles films, were able to produce H2 under solar light simulation (91 and 32 μmol/m2 after 3-h irradiation). This activity was increased when AuPd was deposited as co-catalyst on SnS films; around 8 and 6 times, for SnS-AuPd 25 cycles and SnS-AuPd 50 cycles films, respectively (728 and 175 μmol/m2 after 3-h irradiation). Therefore, it can be assumed that AuPd co-catalyst favors the transfer charge and decrease the electron-hole pair recombination to promote and enhance the photocatalytic H2 production.
ISSN:1010-6030
1873-2666
DOI:10.1016/j.jphotochem.2018.04.033