2D a-Fe2O3 doped Ti3C2 MXene composite with enhanced visible light photocatalytic activity for degradation of Rhodamine B

2D/2D Heterojunction of R-scheme Ti3C2 MXene/MoS2 Nanosheets for Enhanced Photocatalytic Performance

“…The hydrogen production performance of the g-C 3 N 4 /Ti 3 C 2 photocatalyst has enhanced significantly, which is attributed to the superior electrical conductivity and highly efficient charge transfer [44]. TiO 2 /Ti 3 C 2 and α-Fe 2 O 3 /Ti 3 C 2 hybrids are proved to promote the photocatalytic degradation efficiency of organic pollutants under ultraviolet light and visible light by constructing heterojunctions [45][46][47].…”

Positioning MXenes in the Photocatalysis Landscape: Competitiveness, Challenges, and Future Perspectives

“…Therefore, high electrical conductivity and favorable energy structure of MXenes enable them as promising reservoir to trap and shuttle the photoelectrons generated from semiconductors ( Figure 8) and thus promote the separation of charge carriers and the photoactivity enhancement of MXenes-based composites. Such role of MXenes has been reported in various composite photocatalysts, including [34,99] Ti 3 C 2 T x /CdS, [71,114] Ti 3 C 2 T x /Bi 2 WO 6 , [69] [80] Ti 3 C 2 T x /Ag 3 PO 4 , [77] Ti 3 C 2 T x /α-Fe 2 O 3 , [115] TiO 2 @Ti 3 C 2 T x /g-C 3 N 4 , [96] Ti 3 C 2 T x /MoS 2 /TiO 2 , [104] Ti 2 CT x /TiO 2 /M (M = Ag, Pd, or Au), [116] Ti 2 CT x /C 3 N 4 , [117] Ti 3 C 2 T x /Cu 2 O/Cu, [118] Ti 3 C 2 T x /Pt/g-C 3 N 4 , [119] Ti 3 C 2 T x /BiOBr, [120] and Ti 3 C 2 T x /B-doped C 3 N 4 . [121] As various MXenes have been prepared experimentally [122,123] and their intrinsic electronic properties have been studied, [111,[124][125][126] other MXenes besides Ti 3 C 2 T x have attracted increasing research attention in the field of photocatalysis and been utilized as electron reservoir to promote the separation of charge carriers in semiconductors and thus enhance their photo activities.…”

“…[86] It is learned from the above discussion that MXenes exhibit variable work function/Fermi level, which enables them to serve as acceptors for both electrons and holes. [96,[99][100][101][103][104][105][115][116][117][118][119][120][121]132] The flexile electronic properties of MXenes definitely provide more possibilities to deliver their diverse functions and applications. On the other hand, such properties come with the challenges to precisely identify the specific electronic feature of MXenes considering that the type and geometrical conformations of surface terminations on MXenes are sensitive to the preparation conditions.…”

Recent Advances in Functional 2D MXene‐Based Nanostructures for Next‐Generation Devices

“…Compared with pristine 2D MXene, functional 2D MXenes, including surface-modified 2D MXenes and mixed-dimensional 2D MXene-based heterostructures, exhibit remarkably improved performances due to the synergistic effect, which have great potential for next-generation devices in versatile fields. [65,74,[153][154][155][156][157][158] Investigations on the performances of functional 2D MXenes play an important role in understanding the structure-property relationships and functional 2D MXenerelated applications. In this section, the related applications (energy storage and conversion, catalysis, sensors, photodetectors, EMI shielding, and biomedical applications) of functional 2D MXenes are discussed in detail.…”

“…Recent research studies have shown that MXenes have promising potential for photocatalytic applications, due to some distinct properties: i) the high carrier mobility in MXene-based system efficiently promoting the separation and migration of photogenerated electron-hole pairs; ii) the tunable band gap of MXenes by altering their surface chemistries, for example, the terminated -F, -O, or -OH groups, or the arrangements of surface groups; iii) the abundant surface groups with more active sites on the surface of MXene. [178][179][180] It is noted that Ti 3 C 2 T x has already been employed as an efficient co-catalyst in g-C 3 N 4 , [181][182][183][184] Bi 2 WO 6 , [185] BP, [178] AgInS 2 , [65,186] SrTiO 3 , [187] hematite, [154] , anatase, [179,188,189] and so on, to further enhance their photocatalytic performance. For example, in 2018, the 2D MXene Ti 3 C 2 T x /2D g-C 3 N 4 nanosheet heterostructures were rationally designed and successfully synthesized by calcination of bulk Ti 3 C 2 and urea, where urea not only acts as the gas template to process the exfoliation of Ti 3 C 2 into Ti 3 C 2 T x nanosheets, but also as the precursor of g-C 3 N 4 to obtain 2D MXene Ti 3 C 2 T x /2D g-C 3 N 4 nanosheet heterostructures.…”