Fabrication of layered (CdS-Mn/MoS2/CdTe)-promoted TiO2 nanotube arrays with superior photocatalytic properties

Abstract

A novel (CdS-Mn/MoS/CdTe)-sensitized TiO nanotube arrays (NTAs) photoelectrode has been prepared by electrodeposite, successive ionic layer adsorption and reaction (SILAR) coupled with hydrothermal method. When a ZnS layer was added on the top of CdS-Mn/MoS/CdTe/TiO, a notable red-shift and high absorption was observed in the visible light region. The photocurrent density (mA/cm) systematically increases from TiO NTAs (0.43), CdTe/TiO (1.09), MoS/CdTe/TiO (1.80), CdS-Mn/MoS/CdTe/TiO (2.40), to ZnS/CdS-Mn/MoS/CdTe/TiO (3.41) under visible light irradiation, due to the type-II semiconductor heterostructures comprising multiple components with a staggered band offset. Such a heterostructure possesses an enhanced photocatalytic performance towards degradation of organic contaminant, e.g. P-Nitrophenol (PNP) and Rhodamine B (RhB).

1D/2D TiO2/MoS2 Hybrid Nanostructures for Enhanced Photocatalytic CO2 Reduction

“…[1][2][3][4][5][6][7] This approach can recycle CO 2 back to rene wable fuels by using solar energy which is green and inexhaustible. [35][36][37][38][39] Among them, coupling TiO 2 with narrowband semi conductors is regarded as an efficient way to enhance separation of electron-hole pairs and promote light absorption, such as CdSe, [40,41] CdTe, [42,43] MoS 2 , [44][45][46][47] and CdS. [24][25][26] Some strategies were developed to improve the photocata lytic performance including noble metal deposition, [27][28][29][30] doping, [31,32] surface photosensitization, [33,34] and constructing heterojunctions.…”

“…[24][25][26] Some strategies were developed to improve the photocata lytic performance including noble metal deposition, [27][28][29][30] doping, [31,32] surface photosensitization, [33,34] and constructing heterojunctions. [35][36][37][38][39] Among them, coupling TiO 2 with narrowband semi conductors is regarded as an efficient way to enhance separation of electron-hole pairs and promote light absorption, such as CdSe, [40,41] CdTe, [42,43] MoS 2 , [44][45][46][47] and CdS. [48][49][50] As a family member of the 2D materials family, transition metal dichal cogenides (TMDs) have recently attracted much attention owing to their remark able optical and electronic properties.…”

Fabrication of CdTe QDs/BiOI-Promoted TiO2 Hollow Microspheres with Superior Photocatalytic Performance Under Simulated Sunlight

“…Based on the results and discussions above, we propose a synergistic CdTe QDs/BiOI sensitization mechanism of the exciton transfer in TiO 2 /CdTe/BiOI to explain the enhanced photo activity, as illustrated in Scheme 2. It is well known that TiO 2 with a wide bandgap (3.02 eV) could only utilize the UV region in solar light, while the narrow bandgap CdTe QDs (~ 1.5 eV) [32] and BiOI nanostructures (~ 1.8 eV) [33] can be excited by photons in the visible range. In addition, a p-n junction is formed between p-type BiOI and n-type TiO 2 when Fermi levels reached equilibrium, which facilitate photo-induced electrons to migrate from CB of BiOI to that of TiO 2 [17, 34].…”

Fabrication of TiO2/Fe2O3/CdS systems: effects of Fe2O3and CdS content on superior photocatalytic activity

“…respectively. 7,26 The nanocrystalline material structure is conrmed with XRD analysis (Fig. 3c) and the SAED pattern (Fig.…”