MXene-derived C-doped TiO2/Ti3C2 heterojunction as a high-performance visible-light photocatalyst

Abstract

Fabrication TiO 2 with conductive two-dimensional materials is an effective strategy to improve its photocatalytic activity. Herein, a well-de ned carbon doped TiO 2 /Ti 3 C 2 heterojucntion is constructed via in-situ controllable oxidation of Ti 3 C 2 MXene in carbon dioxide. The formed carbon doped TiO 2 nanoparticles as the photocatalyst uniformly disperse on the surface of Ti 3 C 2 MXene and generate electrons and holes under the irradiation. The twodimensional Ti 3 C 2 MXene, ascribing to its excellent conductivity, acts as the electron transport channels and accelerates the separation of photo-generated electrons and holes. Meanwhile, due to its large speci c surface area and good solubility, Ti 3 C 2 MXene may facilitate to enhance the adsorption of pollutant on the photocatalyst as well as the absorption of photocatalyst for visible light. Therefore, the unique properties of TiO 2 and Ti 3 C 2 MXene are integrated in a complementary way and signi cantly improve the photocatalytic performance of the composites.The proper content of Ti 3 C 2 MXene and TiO 2 in the composite is crucial for enhancing the photocatalytic performance, which can be effectively tuned by varying the oxidation temperature. In this work, C-TiO 2 /Ti 3 C 2 oxidized at 400 o C presents the optimum photocatalytic performance.

Functionalized MXene/Halide Perovskite Heterojunctions for Perovskite Solar Cells Stable Under Real Outdoor Conditions

“…153 266 (Figure 1e, black). [ 33–35 ] As it is inferred, the MXene structure undergoes a significant shift of the main diffraction peak (002) after delamination corresponding to an increase of lattice space in the (002) atomic plane direction. According to Figure 1e,f and the Bragg diffraction equation, this shift corresponds the expansion of the atomic plane from 10.01 Å to 14.14 Å.…”

“…Figure 1e shows the XRD of the d-MXene (red) and its comparison to the bulk MXene (blue) before delamination. The peaks indicated as (002), (006), (008), (103), and (110) correspond to [33][34][35]. as reference (black); f) zoomed area of e); g) wide range X-ray diffraction patterns of Bulk MXene (blue), d-MXene (red) and MXene:H3pp (green); (h) zoomed area of g); i) Raman spectra of d-MXene (red) and MXene:H3pp (green); j) Fourier-Transform inferared (FTIR) spectra of d-MXene (red) and MXene:H3pp functionalized with H3pp 0.5 mg (light green) and 1 mg (dark green).…”

“…Schematic represenation of a) bulk MXene, b) delaminated MXene (d-MXene), c) MXene functionalized with H3pp (MXene:H3pp) and d) thre heterojunction made of the MXene:H3pp thin film and the Halide Perovskite thin film (MXene:H3pp/HP); (e) wide range X-ray diffraction (XRD) patterns of bulk MXene (blue), d-MXene and the pattern of the Ti 3 AlC 2 ICSD No. 153 266[33][34][35]. as reference (black); f) zoomed area of e); g) wide range X-ray diffraction patterns of Bulk MXene (blue), d-MXene (red) and MXene:H3pp (green); (h) zoomed area of g); i) Raman spectra of d-MXene (red) and MXene:H3pp (green); j) Fourier-Transform inferared (FTIR) spectra of d-MXene (red) and MXene:H3pp functionalized with H3pp 0.5 mg (light green) and 1 mg (dark green).…”

Three-dimensional bimodal pore-rich G/MXene sponge amalgamated with vanadium diselenide nanosheets as a high-performance electrode for electrochemical water-oxidation/reduction reactions

“…S2†) at 8.4°, 17.8°, 26.7°, 36.1°, 39.7°, and 60.3° can be indexed to the (002), (004), (006), (103), (104), and (110) planes of the Ti 3 C 2 T x MXene phase (JCPDS card: 52-0875), respectively. 39 Fig. 3(a) shows the XRD patterns of VSe 2 , VSe 2 @G and VSe 2 @G/MXe.…”

“…S2 †) at 8.4°, 17.8°, 26.7°, 36.1°, 39.7°, and 60.3°can be indexed to the (002), ( 004), ( 006), ( 103), (104), and (110) planes of the Ti 3 C 2 T x MXene phase (JCPDS card: 52-0875), respectively. 39 01-089-1641), respectively. 40 The XRD patterns of VSe 2 @G show an additional distinctive broad bump at around 23.9°t hat corresponds to the (002) plane of rGO (Fig.…”