Photoelectrochemical Hydrogen Evolution and CO2 Reduction over MoS2/Si and MoSe2/Si Nanostructures by Combined Photoelectrochemical Deposition and Rapid-Thermal Annealing Process

Diverse methods have been employed to synthesize MoS2 and MoSe2 catalyst systems. Herein, a combined photoelectrochemical (PEC) deposition and rapid-thermal annealing process has first been employed to fabricate MoS2 and MoSe2 thin films on Si substrates. The newly developed transition-metal dichalc...

Full description

Saved in:
Bibliographic Details
Published inCatalysts Vol. 9; no. 6; p. 494
Main Authors Hong, Sungmin, Rhee, Choong Kyun, Sohn, Youngku
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.06.2019
Subjects
Annealing
Carbon dioxide
Catalysts
Catalytic converters
Chemical reactions
Chemical synthesis
Chemical vapor deposition
CO2 reduction
Deposition
Electrodes
Electrolytes
Energy
Energy conversion
Hydrogen
hydrogen evolution
Hydrogen evolution reactions
Hydrogen production
Molybdenum compounds
Molybdenum disulfide
Morphology
MoS2
MoSe2
Oxidation
photoelectrochemical deposition
Photoelectrons
Raman spectroscopy
rapid-thermal annealing
Scanning electron microscopy
Silicon substrates
Silver chloride
Spectrum analysis
Thin films
Transition metal compounds
Online AccessGet full text

Cover

More Information
Summary:Diverse methods have been employed to synthesize MoS2 and MoSe2 catalyst systems. Herein, a combined photoelectrochemical (PEC) deposition and rapid-thermal annealing process has first been employed to fabricate MoS2 and MoSe2 thin films on Si substrates. The newly developed transition-metal dichalcogenides were characterized by scanning electron microscopy, Raman spectroscopy and X-ray photoelectron spectroscopy. PEC hydrogen evolution reaction (HER) was demonstrated in an acidic condition to show a PEC catalytic performance order of MoOx/Si < MoS2/Si << MoSe2/Si under the visible light-on condition. The HER activity (4.5 mA/cm2 at −1.0 V vs Ag/AgCl) of MoSe2/Si was increased by 4.8× compared with that under the dark condition. For CO2 reduction, the PEC activity was observed to be in the order of MoS2/Si < MoOx/Si << MoSe2/Si under the visible light-on condition. The reduction activity (0.127 mA/cm2) of MoSe2/Si was increased by 9.3× compared with that under the dark condition. The combined electrochemical deposition and rapid-thermal annealing method could be a very useful method for fabricating a thin film state catalytic system perusing hydrogen production and CO2 energy conversion.
ISSN:2073-4344
2073-4344
DOI:10.3390/catal9060494