2D/2D/1D Structure of a Self-Supporting Electrocatalyst for Efficient Hydrogen Evolution

MXene-based electrocatalysts for hydrogen production have been extensively studied. Herein, we report an efficient and stable electrocatalyst (TiVCTx/MoS2-CNT) with a 2D/2D/1D structure, which is used for electrocatalytic hydrogen evolution. The catalytic performance can be attributed to the rich inherent anchoring sites of TiVCTx, which contribute to the uniform growth of MoS2 nanosheets and reduce the aggregation of MoS2 nanosheets. In addition, multiwalled carbon nanotubes (MWCNTs) are connected to form a 3D nanohybrid, which increases the conductivity of TiVCTx/MoS2 and provides a pathway for the electron transfer of TiVCTx/MoS2. As expected, TiVCTx/MoS2-CNT presented impressive hydrogen evolution activity with an overpotential of 180 mV at 10 mA/cm2 and a small Tafel slope of 79 mV/dec. Furthermore, TiVCTx/MoS2-CNT catalysts exhibit an electrochemical durability of up to 17 h in 0.5 M H2SO4. This work may provide a new idea for the construction of a three-dimensional nanohybrid and the development of an advanced bimetallic MXene-based nanohybrid for the hydrogen evolution reaction (HER).