Comparison of the Photocatalytic and Photoelectrocatalytic Decolorization of Methyl Orange on Sputtered TiO<sub>2</sub> Thin Films

Su, Y. Jennifer; Chou, Tse‐Chuan

doi:10.1515/znb-2005-1108

Cited by 6 publications

(4 citation statements)

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“…The crucial effect of Pt electrode on improvement of the photocatalytic degradation of organic pollutants has also been reported by Su et al which has been mainly attributed to the promoted dissociative adsorption of hydrogen and high electron affinity of Pt, increasing the lifetime of photogenerated chare carriers. 39 The photocurrent response of all three ZnO electrodes during the photoelectrocatalytic experiments at V = 0 (electrolyte: 0.05 M NaCl), i.e. Fig.…”

Section: Resultsmentioning

confidence: 99%

Photocatalytic and photoelectrocatalytic degradation of perfluorooctanoic acid by immobilised ZnO nanoparticles using electrophoretic deposition

Navidpour

Safaei

Zhang

et al. 2023

Environ. Sci.: Nano

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Section: Resultsmentioning

confidence: 99%

Photocatalytic and photoelectrocatalytic degradation of perfluorooctanoic acid by immobilised ZnO nanoparticles using electrophoretic deposition

Navidpour

Safaei

Zhang

et al. 2023

Environ. Sci.: Nano

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“…First, in the suspension system with a powdered photocatalyst, the catalyst has to be separated from the solution after use [14]. Second, the accumulation of the photo-generated electrons and holes in the catalyst are much easier to recombine with each other [14][15][16][17]. Hence, the efficiency of the light utilization is significantly reduced.…”

Section: The Principles Of Photoelectrocatalysismentioning

confidence: 99%

“…This change improves the separation of photogenerated electrons and holes because the extra power applied to the system forces the electrons to move to the external circuit. In this way, the probability of recombination for electrons and holes is greatly decreased [14][15][16][17].…”

Section: The Principles Of Photoelectrocatalysismentioning

confidence: 99%

Tunability of the Photogenerated Charge Carrier Density on Semiconductors By in-Situ Electrochemical Treatments

Liu,

Real,

Mérida

2018

Meet. Abstr.

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With fossil fuels increasingly being exhausted and environment pollutions getting worse, it is necessary for our generation to look for sustainable, renewable and environmentally safe alternative energy sources. Solar energy is so far the most available resource, with around 120,000 TW of solar energy striking the surface of the earth. However, sunlight is just available in the daytime, can change within hours or seasons, and it is spread over low-density collection areas.An efficient way of energy storage is required for the utilization of solar energy. So far, one of the most practical ways to store a significant amount of energy is through a chemical energy carrier.Hydrogen fuel is one of the prime candidates as a future energy carrier which is environmentally friendly during its production, delivery, and consumption. Hydrogen production by photoelectrochemical water splitting using a semiconductor catalyst could be one of the most promising ways to harvest solar energy.In this thesis, an in-situ potentiodynamic approach (cyclic voltammetry) was used to modify the photoelectrocatalytic properties of nanostructured electrodes in different media. The effect of the morphology was studied by comparing TiO2 nanotube and nanorod. Also, the influence of the modification on WO3, ZnO materials was evaluated. The photogenerated charge carrier separation was studied by cyclic voltammetry (CV), linear sweep voltammetry (LSV), chronoamperometry (CA), and Mott-Schottky plots. The morphologies of the samples were tested by scanning electron microscope (SEM). X-ray diffraction (XRD) was used to analyze crystallinity. X-ray photoelectron spectroscopy (XPS) was used to characterize the surface chemical composition. The experimental data proved that electronic properties could be changed by the self-doping process, v Lay SummaryPhotocatalysis and phototelectrocatalysis are promising strategies to capture and store solar energy. Through these processes, the intermittent solar energy can be used as a driven force. The strategies provide a potential solution to the problems of energy shortage and environmental pollution and will benefit human society for sustainable development. The most significant challenge in this field is developing efficient, stable and environmentally friendly materials and devices to work under visible light irradiation for efficient solar conversion. Herein we designed and synthesized micro and nano-structured photoanodes, and improved their properties for photocatalytic and photoelectrocatalytic reaction. This research includes the design of efficient functional photoanodes, and all these investigations provide useful theoretical and experimental supporting for the large-scale manufacturing, industrial development and even pilot realization of photoelectrochemical systems. vi PrefaceThe materials presented in this thesis, including the experimental work, data analysis, and thesis preparation, was completed by Xu Liu under the supervision of Professor Walter Mé rida and Dr.

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“…In order to increase the photocatalytic activity of the TiO 2 , a Pt plate connected to the TiO 2 nanofiber electrode was tested. 18 Under such conditions, the measured MO decolorization rate was denoted as Ri TiO 2 .…”

Section: Photocatalytic and Photoelectrocatalytic Activity Measuremenmentioning

confidence: 99%

Templateless Nanofiber Photoelectrode Prepared Using Mild Hydrothermal Conditions

Su¹,

Weng

Chou

2008

J. Electrochem. Soc.

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The templateless synthesis of titania nanofibers on a Ti foil using a simple and mild approach has been demonstrated. The growth of TiO 2 nanofibers with a diameter of 15 nm on a Ti foil was obtained when Ti foil was hydrothermally treated at 30-95°C in the presence of TiO 2 powder in 0.1-10 M NaOH solutions. Scanning electron microscopy ͑SEM͒ observations revealed that TiO 2 seeds clearly appeared on the TiO 2 foil within 20 s and that fiber-shaped films were formed in less than 90 s. A potential formation mechanism for the titania nanofibers on Ti foil is proposed in terms of SEM observations. After the seeds were formed on the Ti foil, the end-on attachments of the nanoparticles resulted in the linear growth of fiberlike structures, upon which nanoparticles were then self-organized to form solid nanofibers. By calcining at a temperature of 550°C, the TiO 2 nanofiber films exhibited optimal photocatalytic activity due to a fine nanofiber structure and good crystallinity of the anatase-rutile mixed phase. The photocatalytic and photoelectrocatalytic activities of the TiO 2 nanofiber electrodes were also assessed with respect to their ability to degrade methyl orange.Titania is used in diverse applications such as in paint pigments, as an absorbent, in lithium batteries, in sensing applications, in photovoltaic solar cells, and in photocatalysis. 1-6 Nanostructured titania films especially merit attention due to their high surface-to-volume ratio and their interesting properties. Several methods have been explored to produce nanostructured titania nanotubes such as templating, 7-9 anodic oxidation, 10 and hydrothermal reactions. 11-17 Among them, the hydrothermal approach without the need for a template is relatively simple and straightforward.Titania nanotubes prepared by hydrothermal processing were introduced by Kasuga et al., who synthesized nanotubes by chemically treating sol-gel-derived fine TiO 2 -based powders initially with 5-10 M NaOH aqueous solutions at 110°C for 20 h. 11 The investigation suggested titania nanotubes were formed in the subsequent acid treatment following the alkali treatment stage. 12 Seo et al. showed that anatase phase powder digested at 150°C for 12 h with 5 M NaOH has the highest specific surface area. 13 Titania nanotubes and nanorods were synthesized by treating rutile with 10 M NaOH for 48 h at 150 and 180°C, respectively. 14 In order to obtain large oriented arrays and continuous films of TiO 2 nanotubes, the Ti foil containing the predeposited TiO 2 nanoparticles was reacted with 10 M NaOH at 95-160°C for 6 h. 15 However, the preparation conditions for titania nanotubes as cited in the literature are severe ͑i.e., high concentrations, high temperatures, and long hydrothermal durations by autoclaving͒. Moreover, much effort has been directed toward the use of TiO 2 powders as a means to form nanotubes, while similar materials grown on films are rarely mentioned. Although Tian et al. prepared large arrays of TiO 2 -based nanotubes on continuous films, the Ti substrate needed t...

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Comparison of the Photocatalytic and Photoelectrocatalytic Decolorization of Methyl Orange on Sputtered TiO₂ Thin Films

Cited by 6 publications

References 1 publication

Photocatalytic and photoelectrocatalytic degradation of perfluorooctanoic acid by immobilised ZnO nanoparticles using electrophoretic deposition

Photocatalytic and photoelectrocatalytic degradation of perfluorooctanoic acid by immobilised ZnO nanoparticles using electrophoretic deposition

Tunability of the Photogenerated Charge Carrier Density on Semiconductors By in-Situ Electrochemical Treatments

Templateless Nanofiber Photoelectrode Prepared Using Mild Hydrothermal Conditions

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Comparison of the Photocatalytic and Photoelectrocatalytic Decolorization of Methyl Orange on Sputtered TiO2 Thin Films

Cited by 6 publications

References 1 publication

Photocatalytic and photoelectrocatalytic degradation of perfluorooctanoic acid by immobilised ZnO nanoparticles using electrophoretic deposition

Photocatalytic and photoelectrocatalytic degradation of perfluorooctanoic acid by immobilised ZnO nanoparticles using electrophoretic deposition

Tunability of the Photogenerated Charge Carrier Density on Semiconductors By in-Situ Electrochemical Treatments

Templateless Nanofiber Photoelectrode Prepared Using Mild Hydrothermal Conditions

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Comparison of the Photocatalytic and Photoelectrocatalytic Decolorization of Methyl Orange on Sputtered TiO₂ Thin Films