Hydrothermal Synthesis of Novel MoS₂/BiVO₄ Hetero-Nanoflowers with Enhanced Photocatalytic Activity and a Mechanism Investigation

Abstract

The flower-like MoS 2 /BiVO 4 composite with heterojunction has been successfully fabricated by a two-step approach. A possible formation mechanism of this heterostructure was investigated. The calculated valence band offset (VBO) and conduction band offset (CBO) of MoS 2 /BiVO 4 heterojunction showed that the VBO and CBO of MoS 2 /BiVO 4 are 1.4 and 0.3 eV, respectively, implying the formation of well-defined staggered type II band alignment. The photodegradation of methylene blue (MB) was adopted to assess the photocatalytic ability of the pristine MoS 2 and BiVO 4 as well as MoS 2 /BiVO 4 composites. It exhibited that the MoS 2 /BiVO 4 composite structures performed much better than that of the pristine MoS 2 and BiVO 4 , which was due to the staggered band alignment formed between the two structures. Besides, the corresponding mechanism of enhanced photocatalysis regarding the separation of the photogenerated electron−hole pairs for the heterojunction has also been investigated by the first-principles calculation.

N-doped ZnO–MoS2 binary heterojunctions: the dual role of 2D MoS2 in the enhancement of photostability and photocatalytic activity under visible light irradiation for tetracycline degradation

“…In NZM1 heterojunction, N-ZnO NR are deposited over the petallike morphology of MNF, which significantly decreases the groove path of adjacent petals in MNF, due to which it appears as sheet-like morphology (Figure 4e), as evidenced in literature. 45 The presence of all the constituent elements in N-ZnO (N, Zn, O) and NZM1 (N, Zn, O, Mo and S) has been confirmed by EDAX spectra (Figures 4g and 4h). Furthermore, the elemental mapping has also been performed on NZM1 heterojunction, which also confirms the presence of all elements in the heterojunction ( Figure 5).…”

Piezo‐Catalytic Effect on the Enhancement of the Ultra‐High Degradation Activity in the Dark by Single‐ and Few‐Layers MoS2 Nanoflowers

“…[ 13,16 ] Currently, the MoS 2 nanostructures have been found to have a superior photocatalytic activity under a visible-light illumination, by incorporating with the p-type dopant and co-catalysis [ 15 ] of the heterojunction structures, [16][17][18] such as the MoS 2 /TiO 2 , [ 19 ] and the MoS 2 /BiVO 4 . [ 20 ] Nevertheless, they still take a long time and require a large quantity of catalysts for decomposing the organic dye under a UV or visible-light illumination. However, the superior catalyst is characterized to have not only a high catalytic activity under the UV illumination, but also being effective under the visible-light illumination.…”

Epitaxial growth of Pd nanoparticles on molybdenum disulfide by sonochemistry and its effects on electrocatalysis

“…4(a)-(c), the Pd 3d, S 2p and Mo 3d regions of XPS spectrum taken on Pd(33.6)/MoS 2 are shown. 20 The absence of other types of sulfur such as SO 4 2À indicates that the chemical identity of MoS 2 is intact under the UPS condition. 18,19 Contrary to Mo, Pd and S species undergo changes in binding energy (BE) upon forming Pd/MoS 2 samples.…”