Nanocrystalline spinel ferrite for an enriched production of hydrogen through a solar energy stimulated water splitting process

Gobara, Heba M.; Nassar, Ibrahim; Naggar, Ahmed M.A. El; Eshaq, Gh.

doi:10.1016/j.energy.2016.11.001

Cited by 47 publications

(27 citation statements)

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“…The hydrogen production processes were performed using the reaction setup and illumination chamber described in similar studies. [29,30] Also, the whole system was attached to a water-control system to keep the temperature constant during the splitting process. Therefore, the key factor of hydrogen production was associated to the efficiency of the localized [OMIM]Br/FeCl 3 as a photocatalyst.…”

Section: Procedures For Hydrogen Productionmentioning

confidence: 99%

“…[59] The same explanation of the water splitting mechanism through water/methanol mixtures using a photocatalyst was reported in several similar studies in the literature. [29,30,60] Purity of the produced hydrogen gas Although methanol took part in enhancing the hydrogen generation rate, as given in Equations (1)-(3), its usage produces carbon dioxide, which can be considered as a contaminant gas. Thus, it has to be eliminated or to be at least reduced in order to obtain hydrogen with as high purity as possible.…”

Section: Mechanism Of the Presented Water Splitting Processmentioning

confidence: 99%

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Highly Efficient Visible‐Light‐Induced Photocatalytic Hydrogen Production via Water Splitting using FeCl₃‐Based Ionic Liquids as Homogeneous Photocatalysts

2020

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The ionic liquid (IL) 1‐octyl‐3‐methylimidazolium bromide/FeCl3 [OMIM]Br/FeCl3 was prepared with three molar ratios of [OMIM]Br/FeCl3 (0.5 : 1, 1 : 1, and 2 : 1), and fully characterized through 1H and 13C NMR, Fourier‐transform IR, and Raman spectroscopic techniques. The optical properties of the prepared [OMIM]Br/FeCl3 ILs were revealed via diffuse reflectance and photoluminescence spectra. The photocatalytic activity of [OMIM]Br/FeCl3 ILs as homogenous photocatalysts were investigated towards hydrogen generation from methanol/water mixtures under visible light irradiation. The FeCl3‐based IL with [OMIM]Br/FeCl3 molar ratio of 1 : 1 exhibited the highest visible light photocatalytic activity with a hydrogen productivity of 243.2 mmol h−1 g−1 and a hydrogen purity of 95.5 %; such a high hydrogen yield and purity was reported for the first time. It was proposed that [OMIM] Br acted as an electron acceptor, which delayed the electron‐hole pair recombination of FeCl3. Also, [OMIM] Br could capture the produced carbon dioxide that is released with hydrogen gas. Additionally, [OMIM] Br/FeCl3 could be reused six times with nearly the same photocatalytic activity. These outstanding credits in terms of hydrogen generation rate and purity plus the economic feasibility, through several cycles of reuse, could certify such an IL as a promising photocatalyst for employment in water splitting. This paper suggests ways forward for research to develop the use of ILs as efficient and effective photocatalysts for hydrogen generation via water splitting.

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Section: Procedures For Hydrogen Productionmentioning

confidence: 99%

Section: Mechanism Of the Presented Water Splitting Processmentioning

confidence: 99%

Highly Efficient Visible‐Light‐Induced Photocatalytic Hydrogen Production via Water Splitting using FeCl₃‐Based Ionic Liquids as Homogeneous Photocatalysts

2020

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“…Because of the high energy value and the benefit of green cleaning, hydrogen (H 2 ) is a kind of the promising alternative new energy source that can become the substitute of the traditional carbon-based fossil fuels [ 1 – 4 ]. The light-driven photocatalytic water splitting to produce hydrogen has become the most promising method for scientific research to obtain sustainable energy [ 5 , 6 ]. Researchers from all the world had found a mount of semiconductor photocatalyst showing good photocatalytic activities for water splitting to produce hydrogen (H 2 ) [ 7 – 9 ].…”

Section: Introductionmentioning

confidence: 99%

The high photocatalytic efficiency and stability of LaNiO3/g-C3N4 heterojunction nanocomposites for photocatalytic water splitting to hydrogen

Wang

et al. 2020

BMC Chemistry

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A binary direct Z-scheme LaNiO3/g-C3N4 nanocomposite photocatalyst consisted with LaNiO3 nanoparticles and g-C3N4 nanosheets was successfully synthesized by means of mechanical mixing and solvothermal methods in order to improve the photocatalytic water splitting activity. The as-prepared materials were characterized by powder X-ray diffraction (XRD), Scanning Electron microscope (SEM), Transmission Electron microscope (TEM), X-ray photoelectron spectroscope (XPS), Fourier Transform Infrared Spectroscopy (FT-IR) and N2 adsorption–desorption experiments, respectively, demonstrating the formation of interfacial interaction and heterogeneous structure in LaNiO3/g-C3N4 nanocomposites. Under UV-light irradiation, the LaNiO3/g-C3N4 samples which without the addition of any noble metal as co-catalyst behaved enhanced photocatalytic water splitting activity compared with pure LaNiO3 and g-C3N4, owing to the Z-scheme charge carrier transfer pathway. Especially, the LaNiO3/70%g-C3N4 nanocomposite reach an optimal yield of up to 3392.50 µmol g−1 in 5 h and held a maximum H2 evolution rate of 678.5 µmol h−1 g−1 that was 5 times higher than that of pure LaNiO3.

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“…Because of the high energy value and the benefit of green cleaning, hydrogen (H2) is a kind of the promising alternative new energy source that can become the substitute of the traditional carbon-based fossil fuels (1)(2)(3)(4). The light-driven photocatalytic water splitting to produce hydrogen has become the most promising method for scientific research to obtain sustainable energy (5,6). Researchers from all the world had found a mount of semiconductor photocatalyst showing good photocatalytic activities for water splitting to produce hydrogen (H2) (7)(8)(9).…”

Section: Introductionmentioning

confidence: 99%

The high photocatalytic efficiency and stability of LaNiO3/g-C3N4 heterojunction nanocomposites for photocatalytic water splitting to hydrogen

Wang

et al. 2020

Preprint

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A binary direct Z-scheme LaNiO 3 /g-C 3 N 4 nanocomposite photocatalyst consisted with LaNiO 3 nanoparticles and g-C 3 N 4 nanosheets was successfully synthesized by means of mechanical mixing and solvothermal methods in order to improve the photocatalytic water splitting activity. The as-prepared materials were characterized by powder X-ray diffraction (XRD), Scanning Electron microscope (SEM), Transmission Electron microscope (TEM), X-ray photoelectron spectroscope (XPS), Fourier Transform Infrared Spectroscopy (FT-IR) and N 2 adsorption-desorption experiments, respectively, demonstrating the formation of interfacial interaction and heterogeneous structure in LaNiO 3 /g-C 3 N 4 nanocomposites. Under UV-light irradiation, the LaNiO 3 /g-C 3 N 4 samples which without the addition of any noble metal as co-catalyst behaved enhanced photocatalytic water splitting activity compared with pure LaNiO 3 and g-C 3 N 4 , owing to the Z-scheme charge carrier transfer pathway. Especially, the LaNiO 3 /70%g-C 3 N 4 nanocomposite reach an optimal yield of up to 3392.50 µmol g -1 in 5 h and held a maximum H 2 evolution rate of 678.5 µmol h -1 g -1 that was 5 times higher than that of pure LaNiO 3 .

show abstract

Nanocrystalline spinel ferrite for an enriched production of hydrogen through a solar energy stimulated water splitting process

Cited by 47 publications

References 50 publications

Highly Efficient Visible‐Light‐Induced Photocatalytic Hydrogen Production via Water Splitting using FeCl₃‐Based Ionic Liquids as Homogeneous Photocatalysts

Highly Efficient Visible‐Light‐Induced Photocatalytic Hydrogen Production via Water Splitting using FeCl₃‐Based Ionic Liquids as Homogeneous Photocatalysts

The high photocatalytic efficiency and stability of LaNiO3/g-C3N4 heterojunction nanocomposites for photocatalytic water splitting to hydrogen

The high photocatalytic efficiency and stability of LaNiO3/g-C3N4 heterojunction nanocomposites for photocatalytic water splitting to hydrogen

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Nanocrystalline spinel ferrite for an enriched production of hydrogen through a solar energy stimulated water splitting process

Cited by 47 publications

References 50 publications

Highly Efficient Visible‐Light‐Induced Photocatalytic Hydrogen Production via Water Splitting using FeCl3‐Based Ionic Liquids as Homogeneous Photocatalysts

Highly Efficient Visible‐Light‐Induced Photocatalytic Hydrogen Production via Water Splitting using FeCl3‐Based Ionic Liquids as Homogeneous Photocatalysts

The high photocatalytic efficiency and stability of LaNiO3/g-C3N4 heterojunction nanocomposites for photocatalytic water splitting to hydrogen

The high photocatalytic efficiency and stability of LaNiO3/g-C3N4 heterojunction nanocomposites for photocatalytic water splitting to hydrogen

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Highly Efficient Visible‐Light‐Induced Photocatalytic Hydrogen Production via Water Splitting using FeCl₃‐Based Ionic Liquids as Homogeneous Photocatalysts

Highly Efficient Visible‐Light‐Induced Photocatalytic Hydrogen Production via Water Splitting using FeCl₃‐Based Ionic Liquids as Homogeneous Photocatalysts