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(f) (g) (a) (b) (c) (d) (e) Figure 14. a) Electron diffraction pattern of 2H-/1T0-MoS2/graphene heterostructures. b) 2H phase and 1T0 phase of MoS2 nanosheets in as-prepared heterostructures. c) HRTEM image of as-prepared MoS2/graphene and its corresponding FFT. d) Photocurrent densities and e) Nyquist plots of 2H-MoS2, 2H-/1T0-MoS2, and 2H-/1T-MoS2/graphene heterostructures in 0.5 m Na2SO4 electrolyte under visible light. f,g) Band alignment of graphene, 1T-MoS2 (or 1T0- MoS2), and 2H-MoS2 based on the DFT results with the energy level with respect to the vacuum. Reprinted from reference [66]. Copyright 2017, Wiley-VCH. formed h-MoO3 can then reassemble on the 1T-MoS2 owning to the uniform hydrophilic feature. The synergistic effect of the plasmonics behavior of h-MoO3 and the excellent electronic conductivity of 1T- MoS2 leads to the enhanced photoelectrochemical performance. Xu et al.[63] also built up the vertical heterostructures of TiO2/WO3H2O with the assistance of SC CO2 (Figure 11). The formed heterostruc- tures with type II band alignment can effectively separate the elec- tron–hole pairs, resulting in enhanced photocatalytic activity for the degradation of MO and high photocurrent density under simulated solar light irradiation. 2.4.2. SC CO2-Assisted Construction of Lateral Heterostructures Lateral heterostructures of 1T-2H MoS2 single layers have been synthe- sized using SC CO2-induced phase engineering. Zhou et al.[64] fabri- cated 2D lateral WS2/WO3H2O heterostructures through SC CO2- induced chemical reaction (Figure 12). Theoretical and experimental results indicate only monolayer WS2 can be oxidized into oxides. The construction of the heterostructures can create long-lived electron–hole pairs, and enhanced photocatalytic activity toward the degradation of MO and higher photocurrent under visible light irradiation can thus be Energy Environ. Mater. 2018, 1, 46–60 55 © 2018 Zhengzhou UniversityPDF Image | CO2 and 2-Dimensional Nanomaterials with Green Chemistry
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