Facile Synthesis of Superstructured MoS₂ and Graphitic Nanocarbon Hybrid for Efficient Hydrogen Evolution Reaction

The sandwich-like 2H MoS 2 and unilaminar graphitic nanocarbon hybrid was synthesized via graphitizing threonic acid intercalated MoS 2 precursor obtained using hydrothermal process. An excellent electrocatalytic efficiency of hydrogen evolution reaction with a remarkably small overpotential of 195 mV and a Tafel slope of 47 mV/decade is easily accessible for our hybridized catalyst in 0.5 M H 2 SO 4 aqueous solution, much superior to that of pure 2H MoS 2 and threonic acid intercalating MoS 2 nanomaterials. Moreover, the detailed electrochemical activity surface area and electrochemical impedance suggest that the face-to-face stacking of unilaminar 2H MoS 2 and graphitic nanocarbon at an alternating sequence accelerates the mass transport and electron transfer and, thus, enhances the efficiency for electrocatalytic water splitting. This work paves a neoteric and straightforward pathway for the fabrication of superlattice MoS 2 and unilaminar graphitic nanocarbon hybrid, further improving the electrocatalytic efficiency of 2H MoS 2 nanosheets via a synergistic modulation strategy.