Free-standing carbon nanotube–titania photoactive sheets

Koo, Youngmi; Malik, Rachit; Alvarez, Noe T.; Shanov, Vesselin; Schulz, Mark J.; Sankar, Jag; Yun, Yeoheung

doi:10.1016/j.jcis.2015.02.022

Cited by 5 publications

(2 citation statements)

References 44 publications

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“…It is a material with relatively low toxicity, is widely available, has a well-known band gap, and is easily synthesized into various rationally designed morphological forms with desirable physico-chemical properties. These factors are some of the reasons why titania has been used in various applications such as biomorphic ceramics, 4 sensors, 5 photocatalytic applications such as water purification reactions, 6,7 electro-catalysis, 8 as columns in phosphopeptides analysis 9 and in DSSCs. 2,10 A growing area of research is the combination of titania with carbon nanostructures, such as carbon nanotubes (CNTs).…”

Section: Introductionmentioning

confidence: 99%

Multiwalled carbon nanotube-titania nanocomposites: Understanding nano-structural parameters and functionality in dye-sensitized solar cells

Mombeshora¹,

Simoyi²,

Nyamori³

et al. 2015

S.Afr.j.chem

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Nanocomposites consisting of multiwalled carbon nanotubes and titania were synthesized by two methods, namely, sol-gel and chemical vapour deposition (CVD) methods. The work takes advantage of the bridging ability of nanotechnology between macromolecules and the solid state process in engineering alternative nanomaterials for various applications including solar cell fabrication. Physical and chemical characterization of the mesoporous nanocomposites from the two synthetic methods were investigated using Raman spectroscopy, thermogravimetric analysis, Fourier transformation infrared spectroscopy, scanning electron microscopy, transmission electron microscopy, high-resolution transmission electron microscopy, surface characterization and X-ray diffraction analysis. Physicochemical properties in the nanocomposites such as thermal stability, pore volume, crystallinity and surface area were observed to be a subject of MWCNT: titania ratios and synthetic methods. From the CVD synthetic method, observed attributes include more uniform and smoother coating; better crystallinity and larger pore width than sol-gel method. On the other hand, nanocomposites from sol-gel synthetic method had larger surface areas, were more defective and less thermally stable than those from CVD. Nanocomposites by the CVD method performed 39.2 % more efficient than those from sol-gel in light-harvesting experiments. The study shows that the nanocomposites synthesized were more effective than titania alone when the cheaper natural dye, Eosin B, was used. This highlights the great potential of typical nanomaterials in improving the performances of titania in DSSCs as well as lowering the cost of the ultimate devices.

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Section: Introductionmentioning

confidence: 99%

Multiwalled carbon nanotube-titania nanocomposites: Understanding nano-structural parameters and functionality in dye-sensitized solar cells

Mombeshora¹,

Simoyi²,

Nyamori³

et al. 2015

S.Afr.j.chem

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“…15,16 The photoelectrochemical activities of such electrodes have been investigated for the organic decomposition of methylene blue, 15 methyl orange, 16 rhodamine B (RhB) as well as water splitting to generate green hydrogen 10 and CO 2 reduction. 17 omposite thin-film electrodes have been fabricated using various techniques 3,18 such as sol-gel, atomic layer deposition, chemical vapor deposition, and hydrothermal methods. The sol-gel method is frequently used owing to its low manufacturing cost and simplicity.…”

Section: Introductionmentioning

confidence: 99%

Photoelectrochemical Activity of TiO<sub>2</sub>/MWCNT Thin-Film Electrodes with Different Film Structures Prepared by Combining Electrophoretic Deposition and Sol–Gel Method

MATSUNAGA,

YU,

TAKAHASHI

2024

Electrochemistry

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Photoelectrodes have attracted significant attention in green hydrogen production via water electrolysis. Among others, titanium oxide (TiO 2 ) is a representative photoelectrode for the conversion of solar energy in the ultravisible region into electrical and chemical energies. However, the poor solar adsorption of this material and the low anode reaction rate have limited the efficiency of hydrogen production via water electrolysis. In addition, there is an urgent need for more ecofriendly hydrogen production systems. The composite films of TiO 2 and electronically conductive materials with various structures have been investigated to improve the photoelectrochemical activity of TiO 2 by increasing the effective surface area of TiO 2 and electronic conductivity of the films, which suppress the electron-hole pair combination. Herein, TiO 2 and multiwalled carbon nanotube (MWCNT) composite films with various structures are prepared using the sol-gel method and electrophoretic deposition simultaneously, i.e., sol-gel electrophoresis deposition, under different solution conditions. Scanning electron microscopy (SEM)/energy dispersive X-ray spectroscopy (EDS) results reveals that additives and the mixing ratio of TiO 2 sol and MWCNT dispersion solution in the electrophoresis bath affect film structure. Thin-film electrodes with different structures show different photoelectrochemical activities. Most as-fabricated TiO 2 /MWCNT composite thin-film electrodes outperform pristine TiO 2 thin-film electrodes. TiO 2 deposition on the MWCNT network surface with an antenna-like shape yields the best photoelectrochemical activity, achieving a low film resistance and ~80 % anatase/rutile ratio.

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Carbon Fiber Manufacturing and Applications as a Benchmark for Nanotube Superfiber Development

Moon

Yun

Yoo

et al. 2019

Nanotube Superfiber Materials

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Free-standing carbon nanotube–titania photoactive sheets

Cited by 5 publications

References 44 publications

Multiwalled carbon nanotube-titania nanocomposites: Understanding nano-structural parameters and functionality in dye-sensitized solar cells

Multiwalled carbon nanotube-titania nanocomposites: Understanding nano-structural parameters and functionality in dye-sensitized solar cells

Photoelectrochemical Activity of TiO<sub>2</sub>/MWCNT Thin-Film Electrodes with Different Film Structures Prepared by Combining Electrophoretic Deposition and Sol–Gel Method

Carbon Fiber Manufacturing and Applications as a Benchmark for Nanotube Superfiber Development

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