Supercritical-Fluid-Assisted Decoration of MoS2 @ MWCNTs and Their Superior Performance in the Electrochemical Hydrogen Evolution Reaction

摘要

abstract_textpWe demonstrate a simple, effective, one-pot and environmentally benign supercritical fluid (SCF) process for the decoration of MoS2 nanoparticles over the surafce of the multiwalled carbon nanotubes (MWCNTs-MoS2) at a short reaction time of 30 min. The formation of MoS2 by decomposition of ammonium tetrathiomolybdate was confirmed by X-ray diffraction (XRD) analysis. Raman, transmission electron microscopy energy dispersive X-ray spectroscopy (TEM-EDX) and X-ray photoelectron spectroscopic (XPS) analysis further confirms the formation of MoS2 nanoparticles on CNTs during SCF processing. The attachment of MoS2 nanoparticles over CNTs surface were evidently seen in the high-resolution transmission electron microscopy (HR-TEM) imaging and elemental mapping analysis. Interestingly, the fabricated MWCNTs-MoS2 composite exhibited excellent catalytic activity towards hydrogen evolution reaction with a low Tafel slope of 44 mV/dec and high cathodic current density of 10 mA cm(-2) at eta=214 mV vs. RHE. The observed enhanced catalytic activity is mainly ascribed to the synergistic effect between MoS2 nanoparticles and MWCNTs electrical support./p/abstract_text