Efficient Photocatalytic Hydrogen Production through Mn _0.4 Cd _0.6 S /2D Mo ₂ TiC ₂ MXene Ohmic Junction with Effective Light Corrosion Resistance

Abstract Mn 0.4 Cd 0.6 S shows great potential for photocatalytic hydrogen production, but its performance is significantly limited by severe photocorrosion. In this work, through interfacial engineering, Mn 0.4 Cd 0.6 S is introduced onto the surface of the 2D material Mo 2 TiC 2 MXene. Due to the difference in their work functions, an ohmic junction forms at their interface upon contact, promoting electron transfer from Mn 0.4 Cd 0.6 S to Mo 2 TiC 2 MXene. This effect reduces photocorrosion of Mn 0.4 Cd 0.6 S and suppresses the recombination of photogenerated electrons and holes. Meanwhile, Zeta potential measurements reveal that the MM‐10 composite exhibits better dispersibility and stronger proton adsorption capacity, and enhanced photocatalytic hydrogen evolution performance. Photocatalytic hydrogen evolution tests show that the 10% Mn 0.4 Cd 0.6 S / Mo 2 TiC 2 MXene composite achieves the highest hydrogen production rate of 5113.31 µmol·g −1 ·h −1 . This rate is 5.89 times higher than that of pure Mn 0.4 Cd 0.6 S (867.86 µmol·g −1 ·h −1 ). This work provides a strategy for suppressing photocorrosion in photocatalysts by utilizing MXene materials.