Enhanced photocatalytic activity of hydrogenated and vanadium doped TiO2 nanotube arrays grown by anodization of sputtered Ti layers

Motola, Martin; Satrapinskyy, Leonid; Čaplovičová, Mária; Роч, Т.; Gregor, M.; Grančič, Branislav; Gregus, Jan; Čaplovič, Ľubomír; Plesch, G.

doi:10.1016/j.apsusc.2017.11.253

Cited by 45 publications

(28 citation statements)

References 58 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Figure a shows the X‐ray photoelectron spectroscopy (XPS) survey spectrum of V‐TiO 2 , evidencing the presence of Ti, V, and O elements. As shown in Figure b, the typical Ti 2p 3/2 peak for Ti 4+ at 458.61 eV is observed, and other two Ti 2p 1/2 peaks at 463.78 and 464.59 eV are attributed to Ti 3+ and Ti 4+ , respectively . The peaks at 515.79 and 516.91 eV in the region of V 2p are ascribed to V 4+ and V 5+ , respectively (Figure c), suggesting that V species exist in the rutile lattice of V‐TiO 2 in the form of V 4+ and V 5+ .…”

mentioning

confidence: 84%

“…After long‐term NRR electrolysis, XRD analysis confirms that the peaks are still well indexed to rutile TiO 2 (Figure S13, Supporting Information). V 2p and Ti 2p regions have no obvious change in XPS spectra of V‐TiO 2 , but in O 1s region appears a new peak at 533.43 eV which is also attributed to OH bonds in surface hydroxyl groups, as shown in Figure S14 (Supporting Information) …”

mentioning

confidence: 97%

“…The peaks at 515.79 and 516.91 eV in the region of V 2p are ascribed to V 4+ and V 5+ , respectively (Figure c), suggesting that V species exist in the rutile lattice of V‐TiO 2 in the form of V 4+ and V 5+ . For the O 1s region (Figure d), the peak at 529.81 eV is assigned to OTi bond in V‐TiO 2 lattice, and the peak at 531.08 eV is attributed to OH bonds in surface hydroxyl groups (such as absorbed H 2 O) …”

mentioning

confidence: 97%

See 2 more Smart Citations

Greatly Enhanced Electrocatalytic N₂ Reduction on TiO₂ via V Doping

et al. 2019

View full text Add to dashboard Cite

As a sustainable alternative technology to the Haber–Bosch process, electrochemical N2 reduction offers the hope of directly converting N2 to NH3 at ambient conditions. However, its efficiency greatly depends on screening high‐active electrocatalysts for the N2 reduction reaction (NRR). Here, the recent experimental finding that V is an effective dopant to greatly improve the NRR performances of TiO2 toward ambient N2‐to‐NH3 fixation with excellent selectivity is reported. In 0.5 m anhydrous lithium perchlorate, V‐doped TiO2 nanorods attain a high Faradic efficiency of 15.3% and a large NH3 yield of 17.73 µg h−1 mgcat.−1 at −0.40 and −0.50 V versus reversible hydrogen electrode, respectively, rivaling the performances of most reported aqueous‐based NRR electrocatalysts. Density function theory (DFT) calculations are performed to gain further insight into the catalytic mechanism.

show abstract

mentioning

confidence: 84%

mentioning

confidence: 97%

mentioning

confidence: 97%

See 1 more Smart Citation

Greatly Enhanced Electrocatalytic N₂ Reduction on TiO₂ via V Doping

et al. 2019

View full text Add to dashboard Cite

show abstract

“…Vanadium (V), due to its polyvalence, has been applied in various fields such as catalysis, photochemistry, material science, and medicine [1][2][3], and the toxicology of some vanadium species has also attracted extensive attention [4]. In China, vanadium extraction from black shales, a unique and significant vanadium resource, has developed into a systematic and diversified process [5,6].…”

Section: Introductionmentioning

confidence: 99%

“…Vanadium liberation essentially depends on the acid attack. Based on process mineralogy, the major minerals of mica-type shale include quartz (SiO 2 ), feldspar (KAlSi 3 O 8 ), muscovite (KAl 2 (Si 3 Al)O 10 (OH) 2 ), and a little calcite (CaCO 3 ) and pyrite (FeS 2 ) [12]. Actually, muscovite (phyllosilicate) is less thermally stable than quartz and feldspar (tectosilicate).…”

Section: Introductionmentioning

confidence: 99%

Removal Process of Structural Oxygen from Tetrahedrons in Muscovite during Acid Leaching of Vanadium-Bearing Shale

et al. 2018

View full text Add to dashboard Cite

Process mineralogy shows that most vanadium in mica-type black shale exists in the octahedral sites of muscovite. The extraction of vanadium mainly occurs in the acid leaching process with participation of H ions. In this work, we firstly analyzed the dissolution rules of elements in acid leaching of muscovite, then adopted the density functional theory (DFT) calculation to accurately visualize the primary process of the surface corrosion of muscovite by H ions. The experimental results show that K releases the fastest and the release of Al is consistent with K. The simulation results find that the H preferentially shifts to the unsaturated structured O of the tetrahedron to form a strong 001 surface hydroxyl after replacing K, as well as relaxing the near Al(Si)-O bonds for the further removal of structural oxygen. Then, the 001 surface hydroxyls more likely participate in the dehydroxylation reaction through the reverse-path mechanism to remove the structural oxygen and break the hexagonal rings of the tetrahedral sheets. Remarkably, the formation and removal of structural water are overall endoergic, meaning that the disintegration of muscovite requires a sustained supply of heat. Further, the octahedral sheets where vanadium exists can be exposed to the acid environment for overall destruction. This detailed atomic migration process in acid leaching of black shale is visualized, which not only illuminates the reaction mechanism of H ions with the muscovite, but also provides guidance for vanadium extraction from black shale and a new concept for the destruction of other minerals.

show abstract

Enhanced Charge Transfer Process in Morphology Restructured TiO₂ Nanotubes via Hydrochloric Acid Assisted One Step In‐Situ Hydrothermal Approach

Dhandole

Park

et al. 2019

ChemCatChem

View full text Add to dashboard Cite

In this study, we demonstrate the enhanced photoelectrochemical (PEC) performance of the titanium foil based TiO2 nanotube (TNT) array through a simple hydrothermal (HT) acid treatment method. The influence of hydrochloric acid (HCl) concentration variation in HT method on morphology and the photoelectrochemical performances of TNTs nanostructures were studied. Field Emission Scanning Electron Microscopy and X‐ray powder diffraction results confirmed the morphology and crystal structure easily restructured during HCl assisted one step in‐situ hydrothermal approach. The photocurrent density of optimized acid treated TiO2 nanotube (TH‐40) electrode was observed to be 2‐times higher than the pristine TNT electrode. Thereafter, TH‐40 sample exhibited noticeably photoelectrochemical solar hydrogen production of 66 μmol and 82 μmol in NaOH and Na2S/Na2SO3 electrolytes respectively than the pristine TNT. The enhancement of photocatalytic activity was ascribed to the restructured morphology, as well as the efficient charge separation at rutile‐anatase interface in the TH‐40 sample as well as at the electrode‐electrolyte interface. A hydrochloric acid assisted one step in‐situ hydrothermal approach tailors the crystal structure and morphological features, which enhanced the photoelectrochemical properties of TiO2 nanotube.

show abstract

Enhanced photocatalytic activity of hydrogenated and vanadium doped TiO2 nanotube arrays grown by anodization of sputtered Ti layers

Cited by 45 publications

References 58 publications

Greatly Enhanced Electrocatalytic N₂ Reduction on TiO₂ via V Doping

Greatly Enhanced Electrocatalytic N₂ Reduction on TiO₂ via V Doping

Removal Process of Structural Oxygen from Tetrahedrons in Muscovite during Acid Leaching of Vanadium-Bearing Shale

Enhanced Charge Transfer Process in Morphology Restructured TiO₂ Nanotubes via Hydrochloric Acid Assisted One Step In‐Situ Hydrothermal Approach

Contact Info

Product

Resources

About

Enhanced photocatalytic activity of hydrogenated and vanadium doped TiO2 nanotube arrays grown by anodization of sputtered Ti layers

Cited by 45 publications

References 58 publications

Greatly Enhanced Electrocatalytic N2 Reduction on TiO2 via V Doping

Greatly Enhanced Electrocatalytic N2 Reduction on TiO2 via V Doping

Removal Process of Structural Oxygen from Tetrahedrons in Muscovite during Acid Leaching of Vanadium-Bearing Shale

Enhanced Charge Transfer Process in Morphology Restructured TiO2 Nanotubes via Hydrochloric Acid Assisted One Step In‐Situ Hydrothermal Approach

Contact Info

Product

Resources

About

Greatly Enhanced Electrocatalytic N₂ Reduction on TiO₂ via V Doping

Greatly Enhanced Electrocatalytic N₂ Reduction on TiO₂ via V Doping

Enhanced Charge Transfer Process in Morphology Restructured TiO₂ Nanotubes via Hydrochloric Acid Assisted One Step In‐Situ Hydrothermal Approach