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

Abstract

With 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.

Graphdiyne (CnH2n–2) In Situ Anchored with Bimetallic Oxide MnCo2O4 Construct S-Scheme Heterojunction for Efficient Photocatalytic Hydrogen Evolution

“…The technology of photocatalysis is regarded as one of the most promising approaches for hydrogen evolution, enabling the conversion of solar energy into hydrogen energy in a renewable manner. − The heart of photocatalytic hydrogen evolution reaction technology is the selection and preparation of catalysts. Semiconductor catalyst possesses the benefits of being environmentally friendly, free from pollution, exhibiting high catalytic activity and stability, and are gradually replacing metal catalysts as the mainstream. − The ability of electron transfer largely determines the rate of hydrogen evolution. , In recent years, methods such as constructing heterojunction structures, surface-loaded catalysts, and constructing defect engineering have been commonly used to improve electron mobility. − Among them, constructing heterojunctions with multiple catalysts is undoubtedly an effective approach to enhance the rate of photogenerated electron transport. Moreover, S-scheme heterojunctions can establish novel pathways for electron transport, thereby preserving the maximum redox capacity of the catalytic system and enhancing the photocatalytic hydrogen evolution capability.…”

Accelerated “Electron Converter” Characteristics of NiCo-LDH for a CdS-Carbide Photocatalytic System with a Dual Heterointerface

“…Layered double hydroxides (LDHs) with tunable compositions, large specific surface areas, and short electron transfer paths, as well as excellent photoelectrochemical properties, are ideal candidates for building heterojunctions. − In addition, its 2D lamellar structure helps to form face-to-face 2D-2D contacts with other nanosheet cocatalysts or semiconductors, which increases the contact area and enhances the interfacial interactions, and contributes to the transfer of electrons. − More importantly, LDH has a smooth and continuous surface with good hydrophilicity, making it a desirable choice for intermediate layer transition layers.…”

A 1T-WS2 “electron pump” regulates charge transfer over ZnCdS/NiV-LDH p–n heterostructures for enhanced photocatalytic hydrogen evolution

“…In catalytic systems involving ZnCdS, various precedents have been reported to accelerate the transfer of photogenerated charges and inhibit their recombination by adding cocatalysts, such as graphite oxide (RGO), 28 graphdiyne (GDY), 29 g-C 3 N 4 , 30 and layered double hydroxides (LDHs). 31…”