2018
DOI: 10.1002/aenm.201800981
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Inducing a Nanotwinned Grain Structure within the TiO2 Nanotubes Provides Enhanced Electron Transport and DSSC Efficiencies >10%

Abstract: Titania is one of the key materials used in 1D, 2D, and 3D nanostructures as electron transport media in energy conversion devices. In the present study, it is shown that the electronic properties of TiO2 nanotubes can be drastically improved by inducing a nanotwinned grain structure in the nanotube wall. This structure can be exclusively induced for “single‐walled” nanotubes with a high‐temperature treatment in pure oxygen atmospheres. Nanotubes with a twinned grain structure within the tube wall show a stron… Show more

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Cited by 42 publications
(41 citation statements)
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“…The membranes ($80-100 nm nanotube diameter) were fabricated using an optimized sequence of double-anodization and mild annealing steps, followed by li-off from the Ti metal substrate by a chemical etching step (see the ESI for details †). 24,25,41,42 The etching step not only leads to the complete dissolution of the lower anodic tube layer, but also to that of the bottom of the upper layer, thus resulting in the ow-through nanochannel morphology. Despite the number of steps involved, this sequence leads to self-standing and crack-free tubular layers ( Fig.…”
Section: Resultsmentioning
confidence: 99%
See 1 more Smart Citation
“…The membranes ($80-100 nm nanotube diameter) were fabricated using an optimized sequence of double-anodization and mild annealing steps, followed by li-off from the Ti metal substrate by a chemical etching step (see the ESI for details †). 24,25,41,42 The etching step not only leads to the complete dissolution of the lower anodic tube layer, but also to that of the bottom of the upper layer, thus resulting in the ow-through nanochannel morphology. Despite the number of steps involved, this sequence leads to self-standing and crack-free tubular layers ( Fig.…”
Section: Resultsmentioning
confidence: 99%
“…TiO 2 nanotube (NT) membranes can be fabricated by combining (i) self-organizing electrochemical anodization to produce onedimensional TiO 2 nanotubes (NTs) on a Ti substrate, [19][20][21] with (ii) a li-off process, and this results in self-standing, both-endopen and highly aligned nanochannel/nanotube arrays. [22][23][24][25] Such TiO 2 nanotube layers have been recently used as owthrough membranes for the size-selective separation of different solutes, including e.g. biologically relevant molecular substrates and micro-and nano-spheres.…”
Section: Introductionmentioning
confidence: 99%
“…Since then, the electrochemical anodization process has been systematically improved to alter the tube geometries by adjusting the anodization parameters ( e. g ., electrolyte composition and temperature, applied time and voltage, etc .) [16–20] . The control of the nanotube morphology has widened the range of applications, such as for energy conversion, biochemical and medical devices [11,21–23] .…”
Section: Figurementioning
confidence: 99%
“…Specifically, solar cell is a powerful device that can convert the sunlight into electricity power. Dye‐sensitized solar cells (DSSCs) have been widely studied as the novel generation photovoltaic devices due to their great advantages of feasibility, high efficiency, low cost, and so on [2‐10] . Using I-/normalI3- and the cobalt liquid electrolyte, the power conversion efficiency (PCE) can reach up to 12.4 % and 14 %, respectively [11,12] .…”
Section: Introductionmentioning
confidence: 99%