Enhanced photoelectrochemical properties and water splitting activity of self-ordered MoO3-TiO2 nanotubes

Yang, Min; Zhang, Lei; Jin, Bong‐Soo; Huang, Li; Gan, Yang

doi:10.1016/j.apsusc.2015.12.157

Cited by 48 publications

(27 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This value was smaller than those of the photoanodes annealed at 550 • C (728 Ω), 650 • C (649 Ω), and 750 • C (1347 Ω). This suggests a faster charge transfer rate at the photoelectrode/electrolyte interface of Ni/Si-codoped TiO 2 photoanode annealed at 700 • C, therefore enhancing the PEC properties [12,21,60,61]. These results were well consistent with the results of the Mott-Schottky measurements.…”

Section: Resultssupporting

confidence: 87%

Ni/Si-Codoped TiO2 Nanostructure Photoanode for Enhanced Photoelectrochemical Water Splitting

Ding

2019

Materials

View full text Add to dashboard Cite

We synthesized Ni/Si-codoped TiO2 nanostructures for photoelectrochemical (PEC) water splitting, by electrochemical anodization of Ti-1Ni-5Si alloy foils in ethylene glycol/glycerol solutions containing a small amount of water. The effects of annealing temperature on PEC properties of Ni/Si-codoped TiO2 photoanode were investigated. We found that the Ni/Si-codoped TiO2 photoanode annealed at 700 °C had an anatase-rutile mixed phase and exhibited the highest photocurrent density of 1.15 mA/cm2 at 0 V (vs. Ag/AgCl), corresponding to a photoconversion efficiency of 0.70%, which was superior to Ni-doped and Si-doped TiO2. This improvement in PEC water splitting could be attributed to the extended light absorption, faster charge transfer, possibly lower charge recombination, and longer lifetime.

show abstract

Section: Resultssupporting

confidence: 87%

Ni/Si-Codoped TiO2 Nanostructure Photoanode for Enhanced Photoelectrochemical Water Splitting

Ding

2019

Materials

View full text Add to dashboard Cite

show abstract

“…MoO 3 -TiO 2 nanotubes were studied, and MoO 3 -TiO 2 annealed at 650 • C showed an almost-100-times-higher donor concentration than pure TiO 2 nanotubes. The MoO 3 -TiO 2 nanotubes possessed lower charge transfer resistance and improved separation efficiency because of the appearance of MoO 3 [68]. Esparza et al fabricated a Mo-coated Pt HER catalyst which was O 2 -insensitive and stable in acidic media.…”

Section: Photocatalytic Hydrogen Evolution Reactionsmentioning

confidence: 99%

Nanostructured MoO3 for Efficient Energy and Environmental Catalysis

et al. 2019

View full text Add to dashboard Cite

This paper mainly focuses on the application of nanostructured MoO 3 materials in both energy and environmental catalysis fields. MoO 3 has wide tunability in bandgap, a unique semiconducting structure, and multiple valence states. Due to the natural advantage, it can be used as a high-activity metal oxide catalyst, can serve as an excellent support material, and provide opportunities to replace noble metal catalysts, thus having broad application prospects in catalysis. Herein, we comprehensively summarize the crystal structure and properties of nanostructured MoO 3 and highlight the recent significant research advancements in energy and environmental catalysis. Several current challenges and perspective research directions based on nanostructured MoO 3 are also discussed.Molecules 2020, 25, 18 2 of 26 applications in energy and environmental catalysis on account of their relatively low cost, high activity, and stability [9][10][11][12].Molybdenum oxide (MoO 3 ), a kind of transition metal oxide with a n-type semiconducting, nontoxic nature and high stability, has attracted a lot of attention. In particular, nanostructured MoO 3 has demonstrated superior properties to bulk MoO 3 , which is successfully employed in rechargeable batteries [13], capacitors [14], photocatalysis [15], electrocatalysis [16], gas sensors [17], and other applications [6]. The extended tunnels between the MoO 6 octahedra in MoO 3 are suitable for insert/de-insert mobile ions, such as H + and Li + , and multiple oxidation states can enable rich redox reactions. Moreover, the superiorities of low cost, chemical stability, high theoretical specific capacity (1117 mA·h/g), and the environmentally friendly nature make nanostructured MoO 3 exceptional electrode materials for rechargeable batteries capacitors [13,18]. MoO 3 has been investigated as the photocatalyst in terms of its anisotropic layered structure for absorbing UV, as well as visible light. Introducing a defect band by H + intercalation or oxygen vacancies can create defect state and decrease MoO 3 bandgap, which effectively increase the photocatalytic activity [15]. Each oxygen atom bonds to only one molybdenum atom of MoO 6 octahedra, and oxygen vacancy generates Mo dangling bond. MoO 3 favors the adsorption of water molecules in oxygen vacancies, which act as electron acceptors and consequently reduce the energy barrier make it highly reactive for electrocatalysis [2,19]. As a good gasochromic material, MoO 3 has efficient positive-ion accommodation and good charge transfer, and it can be used as an optical-based gas sensor. Moreover, relying on the change in the conductance of the oxide-on-gas adsorption/reaction, MoO 3 has been used for NO, NO 2 , CO, H 2 , NH 3 , and other gases [17]. The unique structure strongly affects the performances. Large efforts have been made to obtain nanostructured MoO 3 with appealing properties by engineering multiple synthetic strategies for the applications in various fields. A variety of methods have been developed, including hydrothermal met...

show abstract

“…In this respect, the efficiency of TiO 2 catalysis needs to be further improved. Many strategies, such as doping [5][6][7][8][9][10][11][12][13][14][15][16][17][18], co-doping [20,21], surface treatment [22], coupling with noble metal nanoparticles [23] or other semiconductors [24,25], synthesis of nanomaterials with different morphologies [26], have been tried over the last few decades, in order to reduce the electron-hole recombination rate and improve the photocatalytic efficiency of TiO 2 .…”

Section: Introductionmentioning

confidence: 99%

Radiocatalytic Cu-incorporated TiO2 nano-particles for the degradation of organic species under gamma irradiation

Samet

March

Stéphan

et al. 2018

Journal of Alloys and Compounds

View full text Add to dashboard Cite

We report on an experimental study aimed at optimizing the radiocatalytic properties of pure and copper-incorporated TiO 2 powders. This has been achieved by conducting crosschecked structural, optical and radiocatalytic studies. Structural and nanoscale analyses show evidence of internal doping by Cu 2+ in the TiO 2 lattice that leads to the reduction of the optical band gap down to 1.5 eV. The effect of gamma radiation on the radiocatalytic activity of these catalysts was studied by degradation of methylene blue as a model pollutant. It was found that the addition of Cu-doped TiO 2 (anatase) powders improves significantly the pollutant degradation, as compared to photocatalysis. The doping and the annealing temperature's impact on the structural, optical and radiocatalytic efficiencies are highlighted and correlated.

show abstract

Enhanced photoelectrochemical properties and water splitting activity of self-ordered MoO3-TiO2 nanotubes

Cited by 48 publications

References 27 publications

Ni/Si-Codoped TiO2 Nanostructure Photoanode for Enhanced Photoelectrochemical Water Splitting

Ni/Si-Codoped TiO2 Nanostructure Photoanode for Enhanced Photoelectrochemical Water Splitting

Nanostructured MoO3 for Efficient Energy and Environmental Catalysis

Radiocatalytic Cu-incorporated TiO2 nano-particles for the degradation of organic species under gamma irradiation

Contact Info

Product

Resources

About