2H- and 1T- mixed phase few-layer MoS2 as a superior to Pt co-catalyst coated on TiO2 nanorod arrays for photocatalytic hydrogen evolution

Liu, Yunpeng; Li, Yuhang; Peng, Feng; Lin, Yuan; Yang, Siyuan; Zhang, Shengsen; Wang, Hongjuan

doi:10.1016/j.apcatb.2018.09.040

Cited by 272 publications

(107 citation statements)

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“…Although a fundamental understanding of the heterostructured interface between TiO 2 and MoS 2 is still lacking, as-constructed junctions phenomenologically exhibited remarkably enhanced activity for photocatalytic hydrogen evolution. For example, several reports demonstrated that photo-generated electrons efficiently transferred from the conduction band of TiO 2 to MoS 2 [15,16,17,18,19]. The role of MoS 2 as electron reservoir renders it a potential candidate to replace the costly noble metal cocatalysts.…”

Section: Introductionmentioning

confidence: 99%

Interfacial Charge Transfer in MoS2/TiO2 Heterostructured Photocatalysts: The Impact of Crystal Facets and Defects

Wei

Lau

et al. 2019

Molecules

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One of the most challenging issues in photocatalytic hydrogen evolution is to efficiently separate photocharge carriers. Although MoS2 loading could effectively improve the photoactivity of TiO2, a fundamental understanding of the charge transfer process between TiO2 and MoS2 is still lacking. Herein, TiO2 photocatalysts with different exposed facets were used to construct MoS2/TiO2 heterostructures. XPS, ESR, together with PL measurements evidenced the Type II electron transfer from MoS2 to {001}-TiO2. Differently, electron-rich characteristic of {101}-faceted TiO2 were beneficial for the direct Z-scheme recombination of electrons in TiO2 with holes in MoS2. This synergetic effect between facet engineering and oxygen vacancies resulted in more than one order of magnitude enhanced hydrogen evolution rate. This finding revealed the elevating mechanism of constructing high-performance MoS2/TiO2 heterojunction based on facet and defect engineering.

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Section: Introductionmentioning

confidence: 99%

Interfacial Charge Transfer in MoS2/TiO2 Heterostructured Photocatalysts: The Impact of Crystal Facets and Defects

Wei

Lau

et al. 2019

Molecules

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“…This process slows down the electron in the conduction band reacts with oxygen molecule to form superoxide anion radicals (O 2 ·− ) 24 , 32 . The electron in the conduction band must be transferred to CB of MoS 2 that has to be used by H 2 O 2 to generate more OH · radical which is involved in the decomposition of CR dye 29 , 97 . The hole (h + ) with higher oxidation potential can contribute to the oxidation of the CR dye 27 .…”

Section: Resultsmentioning

confidence: 99%

“…The selective deposition of (101) plane MoS 2 nanosheet facets on (001)-TiO 2 nanosheets enhanced the photocatalytic H 2 production 28 . MoS 2 nanosheets coated TiO 2 nanorods showed two times higher photocatalytic effect than Pt@TiO 2 29 . Another work on MoS 2 @TiO 2 developed from protonic titanate nanosheets as precursor benefits high electrocatalytic hydrogen evolution, i.e., 26 times greater than pristine MoS 2 based on the cathodic current density 30 .…”

Section: Introductionmentioning

confidence: 94%

Facile synthesis and defect optimization of 2D-layered MoS2 on TiO2 heterostructure for industrial effluent, wastewater treatments

Ramalingam

Chinnapan

Bojarajan

et al. 2020

Sci Rep

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Current research is paying much attention to heterojunction nanostructures. Owing to its versatile characteristics such as stimulating morphology, affluent surface-oxygen-vacancies and chemical compositions for enhanced generation of reactive oxygen species. Herein, we report the hydrothermally synthesized TiO2@MoS2 heterojunction nanostructure for the effective production of photoinduced charge carriers to enhance the photocatalytic capability. XRD analysis illustrated the crystalline size of CTAB capped TiO2, MoS2@TiO2 and L-Cysteine capped MoS2@TiO2 as 12.6, 11.7 and 10.2 nm, respectively. The bandgap of the samples analyzed by UV–Visible spectroscopy are 3.57, 3.66 and 3.94 eV. PL spectra of anatase phase titania shows the peaks present at and above 400 nm are ascribed to the defects in the crystalline structure in the form of oxygen vacancies. HRTEM reveals the existence of hexagonal layered MoS2 formation on the spherical shaped TiO2 nanoparticles at the interface. X-ray photoelectron spectroscopy recommends the chemical interactions between MoS2 and TiO2, specifically, oxygen vacancies. In addition, the electrochemical impedance spectroscopy studies observed that L-MT sample performed low charge transfer resistance (336.7 Ω cm2) that promotes the migration of electrons and interfacial charge separation. The photocatalytic performance is evaluated by quantifying the rate of Congo red dye degradation under visible light irradiation, and the decomposition efficiency was found to be 97%. The electron trapping recombination and plausible photocatalytic mechanism are also explored, and the reported work could be an excellent complement for industrial wastewater treatment.

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“…where N d , e 0 , ε, ε 0, and d(1/C 2 )/dV represent the carrier density, electron charge, the dielectric coefficient (about 170), the permittivity of vacuum, and the straight slope obtained from the plot, respectively [37]. Consequently, the carrier density of H 3 PW 12 O 40 /TiO 2 composite film was 5.92 × 10 22 cm −1 which was higher than that of TiO 2 film (4.86 × 10 22 ).…”

Section: The Kinetics Of H3pw12o40/tio2 Composite Film and Tio2 Film mentioning

confidence: 99%

Optimization of Degradation Kinetics towards O-CP in H3PW12O40/TiO2 Photoelectrocatalytic System

Jiang

Liu

et al. 2019

Sustainability

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Kinetics is crucial for photoelectrocatalytic degradation of organic contaminants. A 12-tungstophosphoric acid/titania (H3PW12O40/TiO2) composite film was prepared by the sol-gel-hydrothermal route to investigate the optimal conditions and degradation kinetics of o-chlorophenol (o-CP). The photoelectrocatalytic degradation efficiency of o-CP was 96.6% after 180 min under optimum conditions (impressed voltage: 0.5 V, solution pH: 6.3, and initial concentration: 5 mg·L−1), and the apparent kinetics constant (K’) was a 6.0-fold increase compared to the photocatalytic system. Furthermore, the photoeletrocatalytic reaction rate of o-CP by H3PW12O40/TiO2 and TiO2 film was 0.090 and 0.020 mg·L−1·min−1, respectively, and a higher apparent quantum yield (Φ = 32.14%) of H3PW12O40/TiO2 composite film was attained compared to TiO2 film (Φ = 10.00%), owing to the fact that more photo-generated carriers were produced and effectively separated. Intermediate products identified during o-CP degradation by liquid chromatography-mass spectrometer (LC-MS) were 2-Chlorohydroquinone (CHQ), catechol (CT), and hydroxyl-hydroquinone (H-HQ). The H3PW12O40/TiO2 photoelectrocatalytic system exhibited outstanding potential for the removal of chlorinated organic contaminants in wastewater.

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2H- and 1T- mixed phase few-layer MoS2 as a superior to Pt co-catalyst coated on TiO2 nanorod arrays for photocatalytic hydrogen evolution

Cited by 272 publications

References 50 publications

Interfacial Charge Transfer in MoS2/TiO2 Heterostructured Photocatalysts: The Impact of Crystal Facets and Defects

Interfacial Charge Transfer in MoS2/TiO2 Heterostructured Photocatalysts: The Impact of Crystal Facets and Defects

Facile synthesis and defect optimization of 2D-layered MoS2 on TiO2 heterostructure for industrial effluent, wastewater treatments

Optimization of Degradation Kinetics towards O-CP in H3PW12O40/TiO2 Photoelectrocatalytic System

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