Photo-catalytic hydrogen production over Fe2O3 based catalysts

Boudjemaa, Amel; Trari, M.

doi:10.1016/j.ijhydene.2010.05.096

Cited by 33 publications

(7 citation statements)

References 22 publications

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“…Current progress in nanostructured hematite synthesis including nanoparticles [42,43], nanowires [44] and nanonets [45] opens opportunities in tackling the drawbacks mentioned above. As a matter of fact, nanostructured photoanode offers an increased semiconductor/electrolyte interfacial area for water oxidation, as well as a substantial reduction of the diffusion length for minority carriers [46,47,48].…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal synthesis of nanostructured Cr-doped hematite with enhanced photoelectrochemical activity

Bouhjar

Mollar

Chourou

et al. 2018

Electrochimica Acta

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Using the easily applicable hydrothermal method Cr-doped hematite thin films have been deposited polycrystalline on conductive glass substrates. The hydrothermal bath consisted of an aqueous solution containing a mixture of FeCl3.6H2O and NaNO3 at pH = 1.5. The samples were introduced in an autoclave and heated for a fixed time at a fixed temperature and then annealed in air at 550ºC. The concentration of the incorporated Cr atoms (Cr 4+ ions) was controlled by varying the concentration of the Cr(ClO4)3 precursor solution, varied from 0 % to 20 %. All samples followed morphological and structural studies using field-emission scanning electron microscopy, high-resolution transmission electron microscopy and X-ray diffraction. Chronoamperometry measurements showed that Cr-doped hematite films exhibited higher photoelectrochemical activity than the undoped films. The maximum photocurrent density and incident photon conversion efficiencies (IPCE) were obtained for 16 at.% Cr-doped films. This high photoactivity can be attributed to both the large active surface area and increased donor density caused by Cr-doping in the α-Fe2O3 films. All samples reached their best IPCE at 400 nm. IPCE values for 16 at.% Cr-doped hematite films were thirty times higher than that of undoped samples. This high photoelectrochemical performance of Cr-doped hematite films is mainly attributed to an improvement in charge carrier properties.

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Section: Introductionmentioning

confidence: 99%

Hydrothermal synthesis of nanostructured Cr-doped hematite with enhanced photoelectrochemical activity

Bouhjar

Mollar

Chourou

et al. 2018

Electrochimica Acta

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“…High crystalline WO 3 was obtained for 20% Fe-doped WO 3 and this effect can also be observed on Fe-doped TiO 2 [31]. The main peak was shifted to lower lattice parameters due to the size of ionic radii of Fe 2+ (0.064 nm) [39], which was larger than W 6+ (0.060) [40]. The shifted peak also suggested that Fe 2+ had successfully replaced some of the W 6+ in bulk WO 3 lattice and thus, Fe-doped WO 3 was successfully synthesized.…”

Section: Xrd Analysismentioning

confidence: 72%

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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“…Several semiconductors have also been used for the production of hydrogen from water such as VO2 [12], CdS [23], Fe2O3 [24] and transition metal containing aluminophosphates [25]. Among these photocatalysts, iron oxide (Fe2O3) has received a great interest due to its band gap that can absorb approximately 60% of the solar energy, its chemical stability, its low cost and its ecological and economic interest [26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, the presence of Fe in the SAPO4-5 or TAPSO4-5 framework improves the redox properties of the catalysts and can shift their absorption spectra to the visible range, offering then an optimum band gap energy [29]. Moreover, it has been shown that the presence of Fe in photo-catalysts, significantly boosts their activity by suppressing the rapid recombination of photo-generated charge carriers [32].…”

Section: Introductionmentioning

confidence: 99%

Improvement of microporous silicoaluminophosphate properties by Fe and Ti insertion for photocatalytic hydrogen generation under visible light

Larbaoui

Hentit

Bentouami

et al. 2022

Microporous and Mesoporous Materials

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Photo-catalytic hydrogen production over Fe2O3 based catalysts

Cited by 33 publications

References 22 publications

Hydrothermal synthesis of nanostructured Cr-doped hematite with enhanced photoelectrochemical activity

Hydrothermal synthesis of nanostructured Cr-doped hematite with enhanced photoelectrochemical activity

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

Improvement of microporous silicoaluminophosphate properties by Fe and Ti insertion for photocatalytic hydrogen generation under visible light

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