Enhanced photoelectrocatalytic degradation of an acid dye with boron-doped TiO2 nanotube anodes

Bessegato, Guilherme G.; Cardoso, J.; Zanoni, María Valnice Boldrin

doi:10.1016/j.cattod.2014.03.073

Cited by 121 publications

(67 citation statements)

References 34 publications

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“…Therefore, electrons move from the counter electrode towards the working electrod,e while holes are generated at the photocathode and reach the Pt counter electrode in order to undertake oxidation reactions. Under negative bias, electron/hole pair recombination is minimized by more efficient charge separation, favoring photoelectrocatalysis target [34,43]. The CO 2 reduction occurs at the Pt surface, where it is converted to •CO 2 - [6,[44][45][46] and hence protonation and deprotonation reactions occur to form the products [12,47].…”

Section: Product Profiles In Photoelectrochemical Co 2 Reductionmentioning

confidence: 99%

A New Si/TiO2/Pt p-n Junction Semiconductor to Demonstrate Photoelectrochemical CO2 Conversion

Guaraldo

Brito

Wood

et al. 2015

Electrochimica Acta

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Section: Product Profiles In Photoelectrochemical Co 2 Reductionmentioning

confidence: 99%

A New Si/TiO2/Pt p-n Junction Semiconductor to Demonstrate Photoelectrochemical CO2 Conversion

Guaraldo

Brito

Wood

et al. 2015

Electrochimica Acta

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“…Nowadays, photoelectrocatalysis is a technique with consolidated principles that has gained prominence and has been successfully applied in organic compound oxidation [4][5][6], inorganic ion reduction [7,8], microorganism inactivation [9,10], CO 2 reduction [11,12], and production of electricity and hydrogen [13][14][15][16]. The subject has since been explored by several researchers and reviews of deserving notoriety [13,[17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Achievements and Trends in Photoelectrocatalysis: from Environmental to Energy Applications

et al. 2015

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The great versatility of semiconductor materials and the possibility of generation of electrons, holes, hydroxyl radicals, and/or superoxide radicals have increased the applicability of photoelectrocatalysis dramatically in the contemporary world. Photoelectrocatalysis takes advantage of the heterogeneous photocatalytic process by applying a biased potential on a photoelectrode in which the catalyst is supported. This configuration allows more effectiveness of the separation of photogenerated charges due to light irradiation with energy being higher compared to that of the band gap energy of the semiconductor, which thereby leads to an increase in the lifetime of the electron-hole pairs. This work presents a compiled and critical review of photoelectrocatalysis, trends and future prospects of the technique applied in environmental protection studies, hydrogen generation, and water disinfection. Special attention will be focused on the applications of TiO 2 and the production of nanometric morphologies with a great improvement in the photocatalyst properties useful for the degradation of organic pollutants, the reduction of inorganic contaminants, the conversion of CO 2 , microorganism inactivation, and water splitting for hydrogen generation.

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“…Among them, doping with non-metal atoms is regarded as simple and effective, providing materials that are stable and that exhibit their activity under visible light illumination. For the intentional doping of titania, nitrogen [8], sulfur [9], phosphorus [10], boron [11,12], and iodine [13] atoms were proposed as favorable non-metallic candidates. Taking into account a number of scientific reports, nitrogen and boron are the most popular dopant atoms, and their presence in titania structures results in a highly active material, whereas the investigation of other possible non-metal atoms is not as widespread.…”

Section: Introductionmentioning

confidence: 99%

Optimization of electrochemical doping approach resulting in highly photoactive iodine-doped titania nanotubes

Szkoda

Siuzdak

Lisowska-Oleksiak

2015

J Solid State Electrochem

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The paper focuses on the optimization procedure concerning the synthesis method resulting in highly ordered titania nanotubes doped with iodine atoms. The doping process was based on the electrochemical treatment of a titania nanotube layer immersed in a potassium iodide (KI) solution acting as an iodine precursor. A number of endeavors were undertaken in order to optimize the doping conditions. Electrolyte concentration, reaction voltage, and time/duration were the main factors that influenced the iodine (I)-doping effect on the photoactivity. The parameters of electrochemical doping that result in a material characterized by the highest photocurrent density are as follows: reaction voltage of 1.5 V, duration of 15 min, and 0.1 M KI. Different spectroscopic techniques, i.e., UV-Vis spectroscopy, Raman spectroscopy, and X-ray photoelectron spectroscopy were used to characterize the absorbance capability and the crystalline phase, to confirm the presence of iodine atoms and to study the nature of chemical compounds. The morphology inspection performed by means of scanning electron microscopy shows that the doping process does not affect the ordered tubular architecture. The photocurrent densities of the I-doped sample were six times higher in comparison to those generated by the pure titania nanotube electrode. Moreover, doped samples act as a much better catalyst in the photodegradation process of methylene blue and formation of hydroxyl radicals (•OH) than undoped samples.

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Enhanced photoelectrocatalytic degradation of an acid dye with boron-doped TiO2 nanotube anodes

Cited by 121 publications

References 34 publications

A New Si/TiO2/Pt p-n Junction Semiconductor to Demonstrate Photoelectrochemical CO2 Conversion

A New Si/TiO2/Pt p-n Junction Semiconductor to Demonstrate Photoelectrochemical CO2 Conversion

Achievements and Trends in Photoelectrocatalysis: from Environmental to Energy Applications

Optimization of electrochemical doping approach resulting in highly photoactive iodine-doped titania nanotubes

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