2D/2D Heterojunction of R-scheme TiC MXene/MoS Nanosheets for Enhanced Photocatalytic Performance.

Combination of two-dimensional (2D) materials and semiconductors is considered to be an effective way for fabricating photocatalysts for solving the environmental pollution and energy crisis. In this work, novel 2D/2D heterojunction of R-scheme TiC MXene/MoS nanosheets is successfully synthesized by hydrothermal reaction. The photocatalytic activity of the TiC MXene/MoS composites is evaluated by photocatalytic degradation and hydrogen evolution reaction. Especially, 0.5 wt% TiC MXene/MoS sample exhibits optimum methyl orange (MO) degradation and H evolution rate of 97.4% and H evolution rate of 380.2 μmol h g, respectively, which is attributed to the enhanced optical absorption ability and increased specific surface area. Additionally, TiC MXene coupled with MoS nanosheets is favorable for improving the photocurrent response and reducing the electrochemical impedance, leading to the enhanced electron transfer of excited semiconductor and inhibition of charge recombination. This work demonstrates that TiC MXene could be a promising carrier to construct 2D/2D heterojunction in photocatalytic degradation and hydrogen evolution reaction.