Abstract
Two-dimensional (2D) transition metal carbides and/or nitrides (MXenes) are a family of graphene-like 2D materials, with unique layered structures, high mechanical strength, excellent carrier mobility, and outstanding physical and chemical properties. In particular, the work function (Φ) of MXenes and Gibbs free energy of the adsorbed intermediate, such as H* (|△GH*|), can be regulated by their surface adsorption groups (–OH, –O, and –F), enabling the applications in the field of photocatalysis. This article systematically summarizes the recent advances of synthetic routes of MXene-based photocatalysts and discusses the interfacial charge kinetics and photogenerated charge transfer mechanism of MXene-based photocatalysts. Furthermore, major challenges and further research trends of MXene-based photocatalysts are also presented.
Highlights
Theoretical and experimental studies have shown that zero dimensional nanodots or quantum dots (QDs) may exhibit distinct properties compared to their 2D counterparts, such as bandgap widening due to quantum confinement, better tunability in physicochemical properties, more abundant active edge sites, and better dispersibility
The CdS@Ti3C2Tx@CoO hierarchical photocatalyst was fabricated toward the photocatalytic water splitting, and Ti3C2Tx MXenes function as a carrier bridge to build a special tandem p–n heterojunction where two secondary internal electric fields were set up and combined into the strong internal electric field existing in the p–n heterojunction
The work function (Fermi level) and ∣△GH∗ ∣ of the MXene heavily depended on the surface terminated groups
Summary
Two-dimensional (2D) materials, such as graphene, hexagonal boron nitride, transition metal dichalcogenides (TMDs), and black phosphorus (BP), have attracted extensive attention due to their outstanding features, including ultrahigh specific surface areas, tunable electronic properties, excellent ionic conductivity, and high Young’s moduli.. Two-dimensional (2D) materials, such as graphene, hexagonal boron nitride, transition metal dichalcogenides (TMDs), and black phosphorus (BP), have attracted extensive attention due to their outstanding features, including ultrahigh specific surface areas, tunable electronic properties, excellent ionic conductivity, and high Young’s moduli.1 In addition to those newly emerged properties due to the atomic thickness, 2D materials achieve grain boundary-free assembly and amplification.. This article does not summarize the preparation and performance of MXene-based photocatalysts but build a bridge between their surface chemistry and photocatalytic applications to discuss their surface termination with the influence on their physiochemical properties and further elucidate the interfacial charge transfer kinetics of MXene-based photocatalysts. It is expected to provide a valuable reference for researchers in the field of MXene interface and catalysis
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