Study of photoactivity of tungsten trioxide (WO3) for water splitting

Eneşca, Alexandru; Duţă, Anca; Schoonman, J.

doi:10.1016/j.tsf.2006.11.135

Cited by 47 publications

(23 citation statements)

References 15 publications

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“…The band gap of the thin films was estimated by plotting (-InT) 1/2 against energy (hν) for undoped and Fe-doped WO 3 thin films, assuming the materials are indirect semiconductors. The band gap of the undoped WO 3 is 2.74 eV and it is in agreement with previous studies [22][23][24][25][26]. Meanwhile, the band gap of the doped thin films was decreased to 2.60 eV as the concentration of Fe increased up to 20%.…”

supporting

confidence: 91%

“…The narrow band gap of 2.20 -2.80 eV helps in absorption of ultraviolet region and blue region of visible light in solar spectrum [22][23][24][25]. Furthermore, WO 3 has been investigated with the aim of improving catalyst activity and stability in the irradiated aqueous environment [26][27][28][29]. Tungsten trioxide powders prepared from various W precursors has been studied by Bamwenda and Arakawa [30].…”

Section: Ng Et Al: Fabrication and Characterization Of Fe-doped Tungsmentioning

confidence: 99%

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FABRICATION AND CHARACTERIZATION OF Fe-DOPED TUNGSTEN TRIOXIDE PHOTOELECTRODES IN AQUEOUS MEDIUM USING TUNGSTIC ACID AND FERROCENE AS STARTING MATERIALS

Hang

Jaafar

Minggu³

et al. 2016

MJAS

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Different compositions of Fe-doped tungsten trioxide thin films were synthesized on fluorine-doped tin oxide (FTO) glass substrate by sol-gel method, with ferrocene and tungstic acid as starting materials. The synthesized thin films was characterized with X-ray diffraction (XRD), scanning electron microscope (SEM), UV/Vis spectrophotometer and photoelectrochemical (PEC) analysis. The results show that the surface morphology of the thin films became rough and the grain size increased along with the concentration of Fe. Monoclinic structure of tungsten trioxide was obtained for all doped and undoped WO 3 and red-shift can be observed from UV-vis spectrum. Band gap reduced from 2.74 eV of undoped WO 3 thin films to 2.60 eV of 20 % Fe-doped WO 3 thin films. Photoactivities of all Fe-doped WO 3 are higher than undoped thin films. The highest photoactivities contributed by 5 % Fe-doped WO 3 films with photocurrent densities measured was 0.148 mA/cm 2 , which is 3 times higher compared to undoped WO 3 .Keywords: Fe-doped WO 3 , direct water splitting, photoelectrochemical cell, photoanode Abstrak Filem nipis tungsten trioksida terdop Fe berbagai komposisi telah disediakan di atas kaca substrat FTO (fluorine-doped tin oxide) dengan kaedah sol-gel, dengan menggunakan ferosin dan asid tingstik sebagai bahan pemula. Filem nipis yang terhasil kemudiannya dicirikan dengan pembelauan sinar X (XRD), mikroskopi elektron pengimbasan (SEM), UV/Vis spektrofotometer dan analisis fotoelektrokimia. Keputusan menunjukkan bahawa morfologi permukaan filem nipis menjadi kasar dan saiz butiran bertambah dengan penambahan kepekatan Fe. Tungsten trioksida yang berstruktur monoklinik telah dihasilkan dan anjakan merah telah diperhatikan di dalam spectrum UV-vis. Jurang tenaga telah berkurang dari 2.74 eV (WO 3 tulen) kepada 2.60 eV (20 % Fe-dop WO 3 ). Fotoaktiviti WO 3 terdop Fe adalah lebih tinggi berbanding WO 3 tulen. Fotoaktiviti yang tertinggi dicatatkan oleh filem 5 % WO 3 terdop Fe dengan ketumpatan fotoarus 0.148 mA/cm 2 . Ia adalah 3 kali ganda lebih tinggi berbanding WO 3 tulen.Kata kunci: Fe-dop WO 3 , pembelahan air secara langsung, sel fotoelektrokimia, fotoanod

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supporting

confidence: 91%

Section: Ng Et Al: Fabrication and Characterization Of Fe-doped Tungsmentioning

confidence: 99%

FABRICATION AND CHARACTERIZATION OF Fe-DOPED TUNGSTEN TRIOXIDE PHOTOELECTRODES IN AQUEOUS MEDIUM USING TUNGSTIC ACID AND FERROCENE AS STARTING MATERIALS

Hang

Jaafar

Minggu³

et al. 2016

MJAS

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“…5) were done at a bias of 0.4 V, 0.5 V and 0.6 V. Both samples show fast response (1-2 sec) under light irradiation. The wavelength was fixed at 375 nm were WO 3 present the maximum absorption [18]. As the bias voltage increase the photocurrent detected in the films increase too.…”

Section: Methodsmentioning

confidence: 99%

Tailoring WO₃ thin layers using spray pyrolysis technique

Eneşca

Duţă

2008

Phys. Status Solidi (c)

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The deposition technique is responsible for the morphological and crystalline properties of the thin films obtained by spray pyrolysis. The influence of the deposition parameters on the WO3 films properties is presented. The main characterisation concerns the topography (AFM), crystalline parameters (XRD), surface tensions (contact angle) and opto‐electronic properties. Due to the changes on the deposition parameter, dense and porous WO3 films were obtained with radically different interface properties. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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“…According to the multipeaks separation fitting results shown in Table 1, the intensity of the -121 diffractive peak decreases in comparison with 121 diffractive peak. The Scherer formula is used to calculate the particle sizes according to the FWHM of -121 diffractive peak [36,37].…”

Section: The Effects Of Citric Acid On the Structure And Morphologymentioning

confidence: 99%

Effects of citric acid and urea on the structural and morphological characteristics of BiVO4 synthesized by the sol–gel combustion method

Chen

Wang

Meng

et al. 2015

J Sol-Gel Sci Technol

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Micro-sized spherical BiVO 4 photocatalysts composed of nanoparticles were synthesized by the sol-gel combustion method. The effects of citric acid and urea on the structural and morphological characteristics of samples were studied by X-ray diffraction, field emission scanning electron microscopy, N 2 adsorption and desorption and UV-Vis spectroscopy. The photocatalytic activity was evaluated by the photocatalytic degradation of rhodamine B under visible light. The results showed the sphere-shaped BiVO 4 sample to have excellent photocatalytic performance compared with the bulk sample prepared by solidstate reaction. This enhancement could be attributed to the special spherical morphology, which enhanced the absorption ability, increased the separation efficiency of photon-generated carriers and improved surface reaction sites for consumption of photon-generated carriers. Graphical Abstract Uniform micro-sized spherical BiVO 4 samples composed of nanoparticles were successfully synthesized by the sol-gel combustion method. The relationships between the morphologies and citric acid with urea contents were studied by using the field emission scanning electron microscopy (FE-SEM) technology.

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Study of photoactivity of tungsten trioxide (WO3) for water splitting

Cited by 47 publications

References 15 publications

FABRICATION AND CHARACTERIZATION OF Fe-DOPED TUNGSTEN TRIOXIDE PHOTOELECTRODES IN AQUEOUS MEDIUM USING TUNGSTIC ACID AND FERROCENE AS STARTING MATERIALS

FABRICATION AND CHARACTERIZATION OF Fe-DOPED TUNGSTEN TRIOXIDE PHOTOELECTRODES IN AQUEOUS MEDIUM USING TUNGSTIC ACID AND FERROCENE AS STARTING MATERIALS

Tailoring WO₃ thin layers using spray pyrolysis technique

Effects of citric acid and urea on the structural and morphological characteristics of BiVO4 synthesized by the sol–gel combustion method

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Study of photoactivity of tungsten trioxide (WO3) for water splitting

Cited by 47 publications

References 15 publications

FABRICATION AND CHARACTERIZATION OF Fe-DOPED TUNGSTEN TRIOXIDE PHOTOELECTRODES IN AQUEOUS MEDIUM USING TUNGSTIC ACID AND FERROCENE AS STARTING MATERIALS

FABRICATION AND CHARACTERIZATION OF Fe-DOPED TUNGSTEN TRIOXIDE PHOTOELECTRODES IN AQUEOUS MEDIUM USING TUNGSTIC ACID AND FERROCENE AS STARTING MATERIALS

Tailoring WO3 thin layers using spray pyrolysis technique

Effects of citric acid and urea on the structural and morphological characteristics of BiVO4 synthesized by the sol–gel combustion method

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Tailoring WO₃ thin layers using spray pyrolysis technique