Nb doped TiO2 nanotubes for enhanced photoelectrochemical water-splitting

Das, Chittaranjan; Roy, Poulomi; Yang, Min; Jha, Himendra; Schmuki, Patrik

doi:10.1039/c1nr10539f

Cited by 193 publications

(146 citation statements)

References 45 publications

(54 reference statements)

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“…The plots of the photocurrent as a function of the TiO2 NT length and diameter, These results are in very good agreement with previous published works. 9 It is also worth mentioning that the transient photocurrent curves obtained with the longest tubes exhibited a decay after illumination (Inset of Figure 6a), this can be attributed to an increased recombination over longer transport pathways. The experiment demonstrates the feasibility to use these gradients for the fast screening of tube properties over a wide range of dimensions.…”

Section: Photocurrent Screeningmentioning

confidence: 99%

“…7,8 The performance of the nanotubes in all these applications depends strongly on their length, diameter and ordering. For instance, an optimal length of 7 m for TiO 2 nanotubes has been reported for solar photoelectrochemical water splitting, 9 ranges of 15-optimum for DSSCs, 4 and it has been shown that TiO 2 nanotubes with a diameter larger than 50 nm impaired the spreading and adhesion of mesenchymal stem cells on nanotubular surfaces. 7,10 Screening the properties of TiO 2 NT arrays as a function of the tubes characteristic dimensions for a given application is consequently of significant importance for the development and the optimization of many important TiO 2 NT-based devices.…”

Section: Introductionmentioning

confidence: 99%

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Bipolar anodization enables the fabrication of controlled arrays of TiO₂ nanotube gradients

Loget

Hahn

et al. 2014

J. Mater. Chem. A

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We report here a new concept, the use of bipolar electrochemistry, which allows the rapid and wireless growth of self-assembled TiO 2 NT layers that consist of highly defined and controllable gradients in NT length and diameter. The gradient height and slope can be easily tailored with the time of electrolysis and the applied electric field, respectively. As this technique allows obtaining in one run a wide range of self-ordered TiO 2 NT dimensions, it provides the basis for rapid screening of TiO 2 NT properties. In two examples, we show how these gradient arrays can be used to screen for an optimized photocurrent response from TiO 2 NT based devices such as dye-sensitized solar cells.

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Section: Photocurrent Screeningmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Bipolar anodization enables the fabrication of controlled arrays of TiO₂ nanotube gradients

Loget

Hahn

et al. 2014

J. Mater. Chem. A

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“…Photoelectrochemical water splitting experiments were carried out under simulated sunlight condition AM 1.5 (100 mW/cm²) in 1 M KOH solution as described in Ref [16]. and an annealed nanosponge.…”

Section: Methodsmentioning

confidence: 99%

Photoelectrochemical Poperties of Anodic TiO2 Nanosponge Layers

Sánchez-Tovar

Lee

Garcı́a-Antón

et al. 2012

ECS Electrochemistry Letters

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In the present work we grow TiO 2 nanosponge structures by anodizing Ti in a glycerol/water/NH 4 F electrolyte to thickness of some m. We evaluate the photoelectrochemical behavior (band gap, photocurrent-voltage characteristics) in presence and absence of methanol. Methanol drastically affects the photoresponse (due to hole capture and current doubling). The optimum thickness for photoelectrochemical applications of these nanostructures is dependent on the excitation wavelength. For applications such as solar light water splitting, anodic sponge structure of ≈ 500 nm thickness can be beneficially used to increase the photoresponse compared to compact TiO 2 layers.

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“…A particularly advantageous method to dope TiO 2 NTs is to anodize alloys of Ti-X (X = W, Mo, Nb), [116][117][118] nanotubes which exhibited similar high conductivity and found that TiO 2 doped with 0.1 at% Nb at an optimal length of 7 μm could produce up to 1.0 mA/cm 2 of photocurrent. 125 In both sets of studies above, the introduction of large amounts of Nb or Ta had detrimental effects, leading the authors to suggest that these elements act as recombination centers at concentrations greater than the optimal concentration of 0.1 at% for both Ta and Nb.…”

Section: Tio 2 Photoanodes In Photoelectrochemical Applications: Modimentioning

confidence: 99%

Titania Nanotubes by Electrochemical Anodization for Solar Energy Conversion

Tsui

Zangari

2014

J. Electrochem. Soc.

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TiO 2 nanotube arrays (NTs) are a promising platform for the conversion of sunlight to electricity in photovoltaic systems or to fuels in photoelectrochemical solar cells. We overview the properties and functionality of the various components of TiO 2 NT-based devices, discuss their integration in the energy conversion system and summarize recent advances in the field. In particular, we discuss the electronic and charge transport properties of TiO 2 NTs that govern the device performance and efficiency. Since the main challenge for the practical use of TiO 2 is the inability to absorb visible light, particular attention is paid to available techniques for TiO 2 sensitization, extending absorption beyond the UV portion of the solar spectrum. These techniques include doping to alter the bandgap and pairing TiO 2 with dyes, inorganic narrow band-gap semiconductors, or metal nanoparticles that exhibit plasmonic behavior. Various catalysts have been successfully paired with TiO 2 to accelerate the photocatalytic reactions of interest; materials, synthesis methods and catalytic mechanisms will also be discussed. Finally, we give a prospective outlook on the future of TiO 2 nanotubes for photoelectrochemical applications and identify areas for future research.

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Nb doped TiO2 nanotubes for enhanced photoelectrochemical water-splitting

Cited by 193 publications

References 45 publications

Bipolar anodization enables the fabrication of controlled arrays of TiO₂ nanotube gradients

Bipolar anodization enables the fabrication of controlled arrays of TiO₂ nanotube gradients

Photoelectrochemical Poperties of Anodic TiO2 Nanosponge Layers

Titania Nanotubes by Electrochemical Anodization for Solar Energy Conversion

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Nb doped TiO2 nanotubes for enhanced photoelectrochemical water-splitting

Cited by 193 publications

References 45 publications

Bipolar anodization enables the fabrication of controlled arrays of TiO2 nanotube gradients

Bipolar anodization enables the fabrication of controlled arrays of TiO2 nanotube gradients

Photoelectrochemical Poperties of Anodic TiO2 Nanosponge Layers

Titania Nanotubes by Electrochemical Anodization for Solar Energy Conversion

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Product

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Bipolar anodization enables the fabrication of controlled arrays of TiO₂ nanotube gradients

Bipolar anodization enables the fabrication of controlled arrays of TiO₂ nanotube gradients