Single-step synthesis of Fe-TiO2 nanotube arrays with improved light harvesting properties for application as photoactive electrodes

Guaglianoni, Waleska Campos; Ruwer, Thais Lemes; Caldeira, Luis Eduardo; Wermuth, Tiago Bender; Venturini, Janio; Bergmann, Carlos Pérez

doi:10.1016/j.mseb.2020.114896

Cited by 16 publications

(9 citation statements)

References 61 publications

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“…The Co‐TiO 2 nanotube electrode presented current density of 0.12 mA.cm −2 at 0.8 V versus Ag/AgCl. This value is similar to results reported in the literature for electrodes obtained under similar synthesis conditions 33,52 . The samples synthesized by CVD at 700 and 800°C showed current densities of 1.13 mA.cm −2 and 7.84 mA.cm −2 , respectively, which is 9 and 65 times greater than the Co‐TiO 2 sample.…”

Section: Resultssupporting

confidence: 90%

“…This value is similar to results reported in the literature for electrodes obtained under similar synthesis conditions. 33,52 The samples synthesized by CVD at 700 and 800°C showed current densities of 1.13 mA.cm −2 and 7.84 mA.cm −2 , respectively, which is 9 and 65 times greater than the Co-TiO 2 sample. It is observed that the deposition of CNTs onto the surface of the Co-TiO 2 nanotubes significantly improved the light-harvesting performance of the electrodes.…”

Section: Resultsmentioning

confidence: 96%

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Influence of CVD parameters on Co‐TiO₂/CNT properties: A route to enhance energy harvesting from sunlight

Guaglianoni

García

Basegio

et al. 2021

Int J Applied Ceramic Tech

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Carbon nanotubes (CNTs) have been employed to enhance the photoactivity of titanium dioxide (TiO 2 ). In this work, CNTs were deposited by chemical vapor deposition (CVD) onto the surface of anodized Co-TiO 2 nanotubes. The influence of CVD parameters (time and temperature) on the Co-TiO 2 /CNT structure and properties was investigated. We studied three synthesis times (10, 20, and 30 min) and two synthesis temperatures (700 and 800°C). The samples were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), Raman spectroscopy, and X-ray diffraction (XRD). The photocurrent performance of the electrodes was determined by linear voltammetry. The results showed the successful formation of Co-TiO 2 /CNT hybrid structures. The shortest synthesis time produced higher quality CNTs. The samples synthesized at 700 and 800°C for 10 min exhibited a current density of 1.13 mA.cm −2 and 7.84 mA.cm −2 , respectively, which is 9 and 65 times greater than the Co-TiO 2 sample. The synergistic effect of the CNT deposition and the crystalline phase composition significantly improved the photoresponse of TiO 2 .The proper choice of synthesis parameters allowed the control of the sample structure, leading to the production of electrodes with better light-harvesting performance.

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Section: Resultssupporting

confidence: 90%

Section: Resultsmentioning

confidence: 96%

Influence of CVD parameters on Co‐TiO₂/CNT properties: A route to enhance energy harvesting from sunlight

Guaglianoni

García

Basegio

et al. 2021

Int J Applied Ceramic Tech

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“…For Fe-TNT fabricated by simultaneous anodization and deposition, the Fe-TNT exhibited a bandgap of 2.90 to 3.05 with no reflection pertaining to iron species from the XRD analysis. The crystal structure and morphological analysis of this study are in good agreement with our finding [28]. This reduction of the bandgap indicated that Fe-TNT1 and Fe-TNT3 should demonstrate higher photo response under halogen lamp illumination.…”

Section: Uv-vis Diffuse Reflectance Analysissupporting

confidence: 91%

“…Apparently, all Fe-TNT samples demonstrated higher photocurrent in comparison with TNT except for Fe-TNT4. Fe-TNT2 179 Lim Ying Chin, Najaa Mustaffa, Asmaa Kadim Ayal, Structural Characterization and Visible Light-Induced Devagi Kanakaraju and Lim Ying Pei Photoelectrochemical Performance of Fe-Sensitized TiO2 Nanotube Arrays Prepared via Electrodeposition showed the highest photocurrent and photoconversion efficiency (Table 3) among all the synthesized samples, suggesting that more photoinduced charges were generated and the recombination between the electrons and holes was prevented [28]. Fe 3+ trapped the photogenerated electrons and holes that reduced the recombination rate of the photogenerated charge carriers.…”

Section: Photoelectrochemical Test Of Fe-tntsmentioning

confidence: 99%

Structural Characterization and Visible Light-Induced Photoelectrochemical Performance of Fe-Sensitized TiO2 Nanotube Arrays Prepared via Electrodeposition

2021

MJCHEM

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Surface modification of TiO2 nanotube arrays via metal doping is one of the approaches to narrow the wide bandgap of TiO2 in order to increase its adsorption to the visible region. The present work focuses on the fabrication of a Fe-sensitized TiO2 nanotube arrays (Fe-TNT) photoanode. Ordered Fe-TNTs were successfully synthesized using a facile two-step electrochemical method by varying the deposition voltage (2-4 V). The morphology, structure, composition, and visible light response were characterized by field-emission scanning electron microscopy (FESEM), X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy (EDX), UV-Vis diffusion reflection spectroscopy (DRS), and photoelectrochemical (PEC) test. The XRD investigation demonstrated that the sensitization of Fe did not destroy the nanotube array structure, and the Fe-TNTs had an anatase phase composed of cubic-like particles at higher deposition voltages. The UV-Vis absorption spectra of the Fe-TNTs showed a redshift of photoresponse towards visible light. Such a redshift was characterized by a decrease in bandgap energy and the photo efficiency was enhanced. The optimal photoelectrochemical performance was observed at 2.5 V deposition voltage for 10 minutes and surpassed that of pristine titania nanotube arrays. The present work demonstrates feasible modification of TiO2 with Fe as a potential photoanode in solar conversion devices.

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“…The negative effects caused by Fe dopant were also found by Zhu et al [45] and Sood et al [47]. At suitable concentrations, the addition of Fe 3+ dopant can improve the performance of the photocatalyst by increasing the radical/ROS species formed, which had been reported by other authors [48][49][50]. The beneficial effects of Fe 3+ as a dopant are expressed in Equations 23 to 26.…”

Section: Microplastic Degradationsupporting

confidence: 56%

Photocatalytic Degradation of Polyethylene Microplastics and Disinfection of E. coli in Water over Fe- and Ag-Modified TiO2 Nanotubes

Yuwendi

Ibadurrohman

Setiadi

et al. 2022

Bull. Chem. React. Eng. Catal.

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In this study, Fe- and Ag-modified TiO2 nanotubes were synthesized via an anodization method as photocatalysts for degradation of polyethylene microplastics and disinfection of Escherichia coli (E. coli). The anodization voltage, as well as the Fe3+ or Ag+ concentrations on TiO2 nanotubes were evaluated and correlated to their corresponding photocatalytic properties. TiO2 nanotubes were firstly synthesized by anodization of Ti plates in a glycerol-based electrolyte, followed by incorporation of either Fe or Ag via a Successive Ionic Layer Adsorption and Reaction (SILAR) method with Fe(NO3)3 and AgNO3 as Fe and Ag precursors, respectively. UV-Vis DRS shows that the addition of Fe or Ag on TiO2 nanotubes causes a redshift in the absorption spectra. The X-ray diffractograms indicate that, in the case of Fe-modified samples, Fe3+ was successfully incorporated into TiO2 lattice, while Ag scatters around the surface of the tubes as Ag and Ag2O nanoparticles. A microplastic degradation test was carried out for 90 mins inside a photoreactor with UVC illumination. TiO2 nanotubes that are anodized with a voltage of 30 V exhibit the best degradation results with 17.33% microplastic weight loss in 90 mins. Among the modified TiO2 nanotubes, 0.03 M Ag-TiO2 was the only one that surpassed the unmodified TiO2 in terms of microplastic degradation in the water, offering up to 18% microplastic weight loss in 90 min. In terms of E. coli disinfection, 0.03M Ag-TiO2 exhibit better performance than its unmodified counterpart, revealing 99.999% bactericidal activities in 10 mins. Copyright © 2022 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).

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Single-step synthesis of Fe-TiO2 nanotube arrays with improved light harvesting properties for application as photoactive electrodes

Cited by 16 publications

References 61 publications

Influence of CVD parameters on Co‐TiO₂/CNT properties: A route to enhance energy harvesting from sunlight

Influence of CVD parameters on Co‐TiO₂/CNT properties: A route to enhance energy harvesting from sunlight

Structural Characterization and Visible Light-Induced Photoelectrochemical Performance of Fe-Sensitized TiO2 Nanotube Arrays Prepared via Electrodeposition

Photocatalytic Degradation of Polyethylene Microplastics and Disinfection of E. coli in Water over Fe- and Ag-Modified TiO2 Nanotubes

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Single-step synthesis of Fe-TiO2 nanotube arrays with improved light harvesting properties for application as photoactive electrodes

Cited by 16 publications

References 61 publications

Influence of CVD parameters on Co‐TiO2/CNT properties: A route to enhance energy harvesting from sunlight

Influence of CVD parameters on Co‐TiO2/CNT properties: A route to enhance energy harvesting from sunlight

Structural Characterization and Visible Light-Induced Photoelectrochemical Performance of Fe-Sensitized TiO2 Nanotube Arrays Prepared via Electrodeposition

Photocatalytic Degradation of Polyethylene Microplastics and Disinfection of E. coli in Water over Fe- and Ag-Modified TiO2 Nanotubes

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Influence of CVD parameters on Co‐TiO₂/CNT properties: A route to enhance energy harvesting from sunlight

Influence of CVD parameters on Co‐TiO₂/CNT properties: A route to enhance energy harvesting from sunlight