Ti3C2 MXene Induced Efficient Electron Transfer over Bimetallic Sulfides and Layered Double Hydroxides

Abstract

AbstractWith a large specific surface area and remarkable electrochemical capabilities, NiAl‐LDH is widely used in photocatalysis. The electrochemical performance of NiAl‐LDH can be further improved by introducing the appropriate amount of Ti3C2 MXene by hydrothermal method. And NiAl‐LDH@Ti3C2 is simply compounded with ZnCdS in a certain ratio to obtain ZnCdS/NiAl‐LDH@Ti3C2. By studying different ratios of ZCSNAT, the optimal ratio of hydrogen evolution activity is 27.10 mmol g−1 h−1 under alkaline solution, which is 9.96 and 1.67 times higher than ZCS and ZnCdS/NiAl‐LDH‐20, while ZnCdS/NiAl‐LDH@Ti3C2‐20 reaches 1883 µmol (37.66 mmol g−1 h−1) in acidic solution, 13.84 and 2.32 times higher than ZnCdS and ZnCdS/NiAl‐LDH‐20. This apparent enhancement is mainly due to the doping of Ti3C2 in the NiAl‐LDH preparation to achieve improved electrochemical properties of NiAl‐LDH. The better electron induction effect of NiAl‐LDH@Ti3C2 greatly improves the electron mobility to the NA surface, which results in a higher photogenerated electron–hole separation efficiency of the composite catalyst based on the original one.