Nanocarved MoS₂–MoO₂ Hybrids Fabricated Using in Situ Grown MoS₂ as Nanomasks

Abstract

The morphology and hybridization of nanostructures are crucial to achieve properties for various applications. An in situ grown 3D MoS2 nano-mask has been adopted to control the morphology and hybridization of molybdenum compounds. The in situ generated MoS2 mask on MoO3 nanobelt surfaces allowed us to fabricate a 3D c-MoO2@MoS2 hybrid nanostructure, in which c-MoO2 is a carved MoO2 nanobelt with well distributed hole-pattern. The nano-masks have been controlled by adjusting the alignments of MoS2. The exposed MoO2 surfaces of c-MoO2@MoS2 were further sulphurated to give cw-MoO2@MoS2, in which all surfaces of MoO2 are wrapped by a few layers of MoS2. The structure synergistically enhanced the electrochemical performances of MoO2 and MoS2, especially at high current rates. Reversible capacity of 1418 mAh/g and 295 mAh/g after 115 and 300 cycles are still remained for the cw-MoO2@MoS2 anodes at current rates of 1 A/g and 10 A/g, respectively.

Freestanding Metallic 1T MoS2 with Dual Ion Diffusion Paths as High Rate Anode for Sodium‐Ion Batteries

“…According to the previous reports, the intense peaks at 184 and 324 cm −1 are corresponding to the typical J1 and J3 peaks of the 1T MoS 2 , which indicated that 1T MoS 2 was obtained in this study. Very small amount of MoO 3 in the as‐grown MoS 2 layer is also confirmed by their vibration at 820 and 958 cm −1 in the Raman spectra (Figure c) . It is important that the graphene scaffold remains intact during the MoS 2 growth process and preserves the mechanical and electronic integrity of the anode structure.…”

Optical and Electrical Enhancement of Hydrogen Evolution by MoS2@MoO3 Core–Shell Nanowires with Designed Tunable Plasmon Resonance

“…The lattice fringes with a d ‐spacing of 0.62 nm in Figure g are assigned to the (002) lattice plane of hexagonal MoS 2 , indicating that the MoS 2 nanosheets are stacked along the c ‐axis, with more active edges exposed . Simultaneously, the (001) plane of hexagonal MoO 3 with a lattice spacing of 0.26 nm is observed in the MoS 2 @MoO 3 composites . Energy‐dispersive X‐ray analysis (EDXA) is conducted to estimate the chemical composition of the hybrid structures, revealing that the material is composed only of Mo, S, and O.…”

Approaching the Lithiation Limit of MoS2 While Maintaining Its Layered Crystalline Structure to Improve Lithium Storage

“…1.5 mm) purchased from Sigma-Aldrich was directly used as electrode materials (Supporting Information, Figure S1). As shown in Figure 1a,t he ordered layered structure of pristine MoS 2 leads to astrong (002) reflection at 14.388 8, [12] which is shifted to alower angle after discharging to 1.0 V. Theintensity of the diffraction peaks around 408 8 becomes much weaker than that of pristine MoS 2 ,which should be ascribed to the intercalation induced phase change. As shown in Figure 1a,t he ordered layered structure of pristine MoS 2 leads to astrong (002) reflection at 14.388 8, [12] which is shifted to alower angle after discharging to 1.0 V. Theintensity of the diffraction peaks around 408 8 becomes much weaker than that of pristine MoS 2 ,which should be ascribed to the intercalation induced phase change.…”

“…Our first aim is to find out the lowest discharging cutoff voltage at which MoS 2 has already undergone conversion reaction but still preserves its layered crystalline structure.T othis end, we collected the powder X-ray diffraction (XRD) patterns ( Figure 1a)a nd SK -edge X-ray absorption spectroscopy (XAS,F igure 1b)o fMoS 2 electrodes discharged to different voltages at 0.05 Ag À1 .T oavoid air exposure during the XRD measurement, the cycled electrodes are sealed with Parafilm, which has little effect on the diffraction peaks of the active materials (Supporting Information, Figure S2). As shown in Figure 1a,t he ordered layered structure of pristine MoS 2 leads to astrong (002) reflection at 14.388 8, [12] which is shifted to alower angle after discharging to 1.0 V. Theintensity of the diffraction peaks around 408 8 becomes much weaker than that of pristine MoS 2 ,which should be ascribed to the intercalation induced phase change. [13] Additionally,n op eaks related to Li 2 Sa re observed in the corresponding XAS spectrum ( Figure 1b).…”