Electrochemical Infilling of CuInSe<sub>2</sub> within TiO<sub>2</sub> Nanotube Layers and Subsequent Photoelectrochemical Studies

Das, Sayantan; Sopha, Hanna; Krbal, Miloš; Zazpe, Raúl; Podzemná, Veronika; Přikryl, Jan; Macák, Jan M.

doi:10.1002/celc.201600763

Cited by 46 publications

(26 citation statements)

References 54 publications

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“…Self‐organized TiO 2 nanotube layers with thickness of ≈5 μm and inner diameter ≈230 nm were prepared according to the well‐established recipe and further used for ALD coatings of ZnO. Illustrative scanning electron microscope (SEM) images of the uncoated nanotube TiO 2 layer are provided as a reference in Figure S1 (Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

“…Titanium (Ti) foils were anodized in ethylene glycol based electrolyte containing 10% water and 0.15 M NH 4 F, 100 V at room temperature using a high‐voltage potentiostat (PGU‐200V, IPS Elektroniklabor GmbH) to fabricate TiO 2 nanotube layers of thicknesses ≈5 μm and inner diameters ≈230 nm . Subsequently, the TiO 2 nanotube layers were annealed at 400 °C, to obtain crystalline nanotube layers in anatase phase which improves their electrical conductivity …”

Section: Methodsmentioning

confidence: 99%

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ZnO Coated Anodic 1D TiO₂ Nanotube Layers: Efficient Photo‐Electrochemical and Gas Sensing Heterojunction

Kuberský

Krbal

et al. 2017

Adv Eng Mater

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The authors demonstrate, in this work, a fascinating synergism of a high surface area heterojunction between TiO 2 in the form of ordered 1D anodic nanotube layers of a high aspect ratio and ZnO coatings of different thicknesses, produced by atomic layer deposition. The ZnO coatings effectively passivate the defects within the TiO 2 nanotube walls and significantly improve their charge carrier separation. Upon the ultraviolet and visible light irradiation, with an increase of the ZnO coating thickness from 0.19 to 19 nm and an increase of the external potential from 0.4-2 V, yields up to 8-fold enhancement of the photocurrent density. This enhancement translates into extremely high incident photon to current conversion efficiency of %95%, which is among the highest values reported in the literature for TiO 2 based nanostructures. In addition, the photoactive region is expanded to a broader range close to the visible spectral region, compared to the uncoated nanotube layers. Synergistic effect arising from ZnO coated TiO 2 nanotube layers also yields an improved ethanol sensing response, almost 11-fold compared to the uncoated nanotube layers. The design of the high-area 1D heterojunction, presented here, opens pathways for the light-and gas-assisted applications in photocatalysis, water splitting, sensors, and so on.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

ZnO Coated Anodic 1D TiO₂ Nanotube Layers: Efficient Photo‐Electrochemical and Gas Sensing Heterojunction

Kuberský

Krbal

et al. 2017

Adv Eng Mater

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“…Figure a shows the incident photon‐to‐electron conversion efficiencies (IPCE) spanning across the UV and visible spectral regions, recorded at 0.4 V against the Ag/AgCl reference electrode. The IPCE for each wavelength was calculated from photocurrent density measurements as reported previously . The presence of MoSe x O y coatings within the TiO 2 nanotube layers significantly enhanced the IPCE, compared to the blank TiO 2 nanotube layer.…”

Section: Resultsmentioning

confidence: 99%

MoSe_xO_y‐Coated 1D TiO₂ Nanotube Layers: Efficient Interface for Light‐Driven Applications

Krbal

Zazpe

et al. 2017

Adv Materials Inter

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in the materials science community. [2] Apart from the generation of H 2 and O 2 gases, photocatalysis can be extended to other applications. The early works on the irradiation of TiO 2 for purification of water via photocatalytic decomposition of pollutants were demonstrated by Frank and Bard in late 1970s. [3][4][5] These initial works and many reports later have shown that photooxidation of inorganic and organic contaminants is a promising route for environmental remediation. [6][7][8][9][10][11][12] In fact, the key factors that determine the efficiencies of a photocatalyst include its light harvesting capability and reduced charge carriers recombination of the photo generated electron-hole pairs. [3,13] However, TiO 2 possesses rather wide bandgap energies between 3.0 and 3.2 eV, with high photo activity only in the UV region (λ ≤ 390 nm) equivalent to only ≈5% of the solar spectrum. [14,15] Nevertheless, owing to its nontoxicity, low-cost synthesis, chemical inertness, and resistance against photocorrosion, TiO 2 has been long studied and recognized as the most promising photocatalyst material. [13,16] In order to harness more from the abundant renewable energy source, that is, solar energy, tremendous efforts have been devoted to reduce the bandgap energy of TiO 2 and broaden its optical absorption to the visible region. [8,[13][14][15]17,18] Bandgap engineering has been extensively carried out Ultrathin molybdenum oxyselenide (MoSe x O y ) coatings are made first ever by atomic layer deposition (ALD) within anodic 1D TiO 2 nanotube layers for photoelectrochemical and photocatalytic applications. The coating thickness is controlled through varying ALD cycles from 5 to 50 cycles (corresponding to ≈1-10 nm). In the ultraviolet region, the coatings have enhanced up to four times the incident photon-to-current conversion efficiency (IPCE), and the highest IPCE is recorded at 32% at (at λ = 365 nm). The coatings notably extend the photoresponse to the visible spectral region and remarkable improvement of photocurrent densities up to ≈40 times is registered at λ = 470 nm. As a result, the MoSe x O y -coated-TiO 2 nanotube layers have shown to be an effective photocatalyst for methylene blue degradation, and the optimal performance is credited to a coating thickness between 2 and 5 nm (feasible only by ALD). The enhancement in photoactivities of the presented heterojunction is mainly associated with the passivation effect of MoSe x O y on the TiO 2 nanotube walls and the suitability of bandgap position between MoSe x O y and TiO 2 interface for an efficient charge transfer. In addition, MoSe x O y possesses a narrow bandgap, which favors the photoactivity in the visible spectral region.

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“…TiO 2 nanotube layers, with a thickness of ∼5 μm and a diameter of ∼230 nm, were prepared according to the previously published work. 44 In brief, Ti foils (Sigma Aldrich, 0.127 mm thick, 99.7% purity) were degreased in isopropanol and acetone and afterwards anodized in an ethylene glycolbased electrolyte containing 150 mM NH 4 F and 10 vol % H 2 O at 100 V for 4 h. The electrochemical cell consisted of a highvoltage potentiostat (PGU-200V; Elektroniklabor GmbH) in a two-electrode configuration, with a Pt foil as the counter electrode and Ti foil as the working electrode. After anodization, the nanotube layers were sonicated in isopropanol and dried in air.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

ALD Al₂O₃ Coated TiO₂ Nanotube Layers As Anodes for Lithium Ion Batteries

Sopha,

Salian,

Zazpe

et al. 2017

Meet. Abstr.

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The utilization of the anodic TiO 2 nanotube layers, with uniform Al 2 O 3 coatings of different thicknesses (prepared by atomic layer deposition, ALD), as the new electrode material for lithium-ion batteries (LIBs), is reported herein. Electrodes with very thin Al 2 O 3 coatings (∼1 nm) show a superior electrochemical performance for use in LIBs compared to that of the uncoated TiO 2 nanotube layers. A more than 2 times higher areal capacity is received on these coated TiO 2 nanotube layers (∼75 vs 200 μAh/cm 2) as well as higher rate capability and coulombic efficiency of the charging and discharging reactions. Reasons for this can be attributed to an increased mechanical stability of the TiO 2 nanotube layers upon Al 2 O 3 coating, as well as to an enhanced diffusion of the Li + ions within the coated nanotube layers. In contrast, thicker ALD Al 2 O 3 coatings result in a blocking of the electrode surface and therefore an areal capacity decrease.

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Electrochemical Infilling of CuInSe₂ within TiO₂ Nanotube Layers and Subsequent Photoelectrochemical Studies

Cited by 46 publications

References 54 publications

ZnO Coated Anodic 1D TiO₂ Nanotube Layers: Efficient Photo‐Electrochemical and Gas Sensing Heterojunction

ZnO Coated Anodic 1D TiO₂ Nanotube Layers: Efficient Photo‐Electrochemical and Gas Sensing Heterojunction

MoSe_xO_y‐Coated 1D TiO₂ Nanotube Layers: Efficient Interface for Light‐Driven Applications

ALD Al₂O₃ Coated TiO₂ Nanotube Layers As Anodes for Lithium Ion Batteries

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Electrochemical Infilling of CuInSe2 within TiO2 Nanotube Layers and Subsequent Photoelectrochemical Studies

Cited by 46 publications

References 54 publications

ZnO Coated Anodic 1D TiO2 Nanotube Layers: Efficient Photo‐Electrochemical and Gas Sensing Heterojunction

ZnO Coated Anodic 1D TiO2 Nanotube Layers: Efficient Photo‐Electrochemical and Gas Sensing Heterojunction

MoSexOy‐Coated 1D TiO2 Nanotube Layers: Efficient Interface for Light‐Driven Applications

ALD Al2O3 Coated TiO2 Nanotube Layers As Anodes for Lithium Ion Batteries

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Electrochemical Infilling of CuInSe₂ within TiO₂ Nanotube Layers and Subsequent Photoelectrochemical Studies

ZnO Coated Anodic 1D TiO₂ Nanotube Layers: Efficient Photo‐Electrochemical and Gas Sensing Heterojunction

ZnO Coated Anodic 1D TiO₂ Nanotube Layers: Efficient Photo‐Electrochemical and Gas Sensing Heterojunction

MoSe_xO_y‐Coated 1D TiO₂ Nanotube Layers: Efficient Interface for Light‐Driven Applications

ALD Al₂O₃ Coated TiO₂ Nanotube Layers As Anodes for Lithium Ion Batteries