Enhanced photoelectrochemical performance of MoS2 nanobelts-loaded TiO2 nanotube arrays by photo-assisted electrodeposition

MoS2 Quantum Dots@TiO2 Nanotube Arrays: An Extended‐Spectrum‐Driven Photocatalyst for Solar Hydrogen Evolution

“…From the XPS analysiso fM oS 2 QDs/TiO 2 NTAc omposites ( Figure S8 in the Supporting Information), it can be seen that the as-synthesized sample contains Ti,O ,M o, S, and adventitious C. Figure 5a shows the XPS spectra of Ti 2p in both pristine TiO 2 NTAs and MoS 2 QDs/TiO 2 NTAs;i ti ndicates that Ti 4 + is present in the two samples, confirmed through ac omparison of the binding-energy splittingo fa pproximately 5.8 eV between the Ti 2p 1/2 and Ti 2p 3/2 peaks. [42] The fittedp eak of Ti 2p for MoS 2 QDs/TiO 2 NTAs shifted to negative higher energies, arisingf rom the presence of Ti 3 + states,w hich show higher reaction activity by capturing electrons, thus leading to radicals formed on TiO 2 NTAs by covalentb ondinge ffects. These shal- , and (f-i)EDX elementalm appings of the selected area indicated by the red rectangular box in (e).…”

“…ChemSusChem 2018ChemSusChem , 11,1708ChemSusChem -1721 www.chemsuschem.org 2018 Wiley-VCH Verlag GmbH &Co. KGaA, Weinheim low defectsc an release captured chargec arriers to the neighboring valence or CBs by thermale xcitation, which contributes to enhanced photocatalytic activity. [42] Figure 5c shows the high-resolution XPS spectrum of Mo 3d;t he two peaks at 232.5 and 229.4 eV are attributed to Mo 4 + 3d 3/2 and Mo 4 + 3d 5/2 ,r espectively,a nd the peak at 226.4 eV is ascribed to S2s. [42] Figure 5c shows the high-resolution XPS spectrum of Mo 3d;t he two peaks at 232.5 and 229.4 eV are attributed to Mo 4 + 3d 3/2 and Mo 4 + 3d 5/2 ,r espectively,a nd the peak at 226.4 eV is ascribed to S2s.…”

“…[43] The high-resolution XPS spectra of O1si nb oth pristine TiO 2 and MoS 2 QDs/TiO 2 NTAs are shown in Figure 5b;t he major peaks at 530.0 and5 30.6 eV are ascribed to lattice oxygen, and the weak peaks at 531.6 and 532.4 eV are observed because of the existence of as urface hydroxy group. [42] Figure 5c shows the high-resolution XPS spectrum of Mo 3d;t he two peaks at 232.5 and 229.4 eV are attributed to Mo 4 + 3d 3/2 and Mo 4 + 3d 5/2 ,r espectively,a nd the peak at 226.4 eV is ascribed to S2s. The separation energy of about 3.4 eV can be attributed to the typical features of Mo, which similarly exists in MoS 2 QDs with corresponding binding energieso fa bout 231.9 and 228.7 eV,r espectively.F or the high-resolution XPS spectrum of the S2pr egion, the fitted peaks at 161.9 and 162.8 eV are attributed to S2p 3/2 and S2p 1/2 , respectively (Figure 5d), which are similar to MoS 2 QDs with correspondingb inding energies of about 161.4 and 162.7 eV, respectively.T he fitted peaks of MoS 2 QDs/TiO 2 NTAs are shifted to negative highere nergies, indicating that electronic interactions exist in MoS 2 and TiO 2 .…”

Fabrication of ZnO@MoS2 Nanocomposite Heterojunction Arrays and Their Photoelectric Properties

“…In this study, we successfully grow flower-like MoS 2 on ZnO nanorods following the two-step hydrothermal method forming ZnO@MoS 2 heterojunction. Among them, ZnO is a wide bandgap (3.37 eV) n-type semiconductor, MoS 2 nanosheet is a narrow bandgap (1.2 eV) P-type semiconductor [50], and ZnO@MoS 2 heterojunction contributes to specific charge transfer dynamics and electron-hole pair separation, effectively improving its photoelectric performance [51,52], combined with low-dimensional MoS 2 film with good on/off current ratio and high carrier mobility. After excitation with 1000 W/m 2 light, when the bias voltage is 0.3 V, the photogenerated electrons and holes generated in ZnO and MoS 2 are directly separated.…”

Enhanced sunlight-driven photocatalytic property of Mg-doped ZnO nanocomposites with three-dimensional graphene oxide/MoS2 nanosheet composites

“…have been reported for photocatalytic reactions, and the results show that MoS 2 -based heterojunctions exhibit enhanced photocatalytic activity under visible light. [17][18][19][20][21][22] Recently, signicant attention has been devoted to apply the two-dimensional layered MoS 2 sheet for improving the photocatalytic activity owing to the unique nature of its open band gap, distinctive physicochemical properties, native vacancy defects and low electrical conductivity. [23][24][25] Unfortunately, the photocatalytic activity of pure layered MoS 2 sheet is very weak due to quick recombination of excitons, which impedes charge transfer at the surface.…”