Dual-Phase MoS2 And MXene Nanohybrids for Efficient Electrocatalytic Hydrogen Evolution
Abstract
Molybdenum Disulfide (MoS2) has been recognized as a potential substitution of Platinum (Pt) for electrochemical hydrogen evolution reaction (HER). However, the broad adoption of MoS2 is hindered by its limited number of active sites and relatively low inherent electrical conductivity. In this work, we demonstrated a synergistic enhancement of both active site exposure and electrical conductivity by a one-step solvothermal synthesis technique. The 1T-phase enriched MoS2 was directly formed on the titanium carbide (Ti3C2Tx, MXene) with carbon nanotubes (CNTs) acting as crosslinks. The existence of edge-enriched metallic phase MoS2, the conductive backbone of MXene along with the crosslinking function of CNTs clearly improved the overall electrical conductivity of the catalyst. Moreover, the integration of two-dimensional (2D) MoS2 with MXene effectively suppressed the MXene oxidation and 2D layer restacking, leading to good catalytic stability. As a result, an overpotential of 169 mV and a low Tafel slope of 51 mV/dec was successfully achieved. This work provides a new route for 2D-based electrocatalyst engineering and sheds light on the development of the next-generation PGM-free HER electrocatalysts.
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