Publication Date
12-17-2019
Journal
Molecules
DOI
10.3390/molecules24244631
PMID
31861235
PMCID
PMC6943669
PubMedCentral® Posted Date
12-17-2019
PubMedCentral® Full Text Version
Post-print
Published Open-Access
yes
Keywords
Catalysis, Chemistry Techniques, Synthetic, Disulfides, Electrochemistry, Hydrogen, Kinetics, Microspheres, Molybdenum, Rhenium, Spectrum Analysis, X-Ray Diffraction, molybdenum disulfide, rhenium doping, hydrothermal synthesis, HER, hydrogen evolution reaction
Abstract
In this research, we report a simple hydrothermal synthesis to prepare rhenium (Re)- doped MoS2 flower-like microspheres and the tuning of their structural, electronic, and electrocatalytic properties by modulating the insertion of Re. The obtained compounds were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), Raman spectroscopy, and X-ray photoelectron spectroscopy (XPS). Structural, morphological, and chemical analyses confirmed the synthesis of poorly crystalline Re-doped MoS2 flower-like microspheres composed of few stacked layers. They exhibit enhanced hydrogen evolution reaction (HER) performance with low overpotential of 210 mV at current density of 10 mA/cm2, with a small Tafel slope of 78 mV/dec. The enhanced catalytic HER performance can be ascribed to activation of MoS2 basal planes and by reduction in charge transfer resistance during HER upon doping.
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