Abstract:The engineered high aspect ratio of Fe2O3 nanorods coated with g-C3N4 demonstrates z-scheme mechanism, showing the best performance in 4-nitrophenol photodegradation and H2 evolution.
“…Also, there is no prominent peak detected for Co 3 O 4 , which proves that no significant Co was left unincorporated into the lattice of LaCoO 3 during pure perovskite phase formation. Moreover, B-g-C 3 N 4 and P-g-C 3 N 4 show the same characteristic Raman peaks at 707 cm –1 indicating the presence of a triazine ring, and 751 cm –1 shows the A1 vibrations of the triazine ring, while the breathing mode of the triazine ring is indicated by a Raman peak at 980 cm –1 . The vibrational mode of g-C 3 N 4 heterocycles is shown by Raman peaks at 474 and 1233 cm –1 .…”
La
x
Co
y
O3 perovskite dispersed porous three-dimensional (3D) g-C3N4 hollow nanotubes to construct a Z-scheme nanocomposite
were successfully synthesized via a wet impregnation assisted ultrasonic
approach and were used for photocatalytic H2 generation
in a liquid phase slurry photoreactor under visible light. A rhombohedral
distorted LaCoO3 perovskite with 1.70 eV narrow band gap
for improved optical properties was synthesized by the combination
of coprecipitation and a hydrothermal method. Additionally, two-dimensional
(2D) porous g-C3N4 with advantageous structural
features was synthesized by a novel, facile, and cost-effective technique
depicting exposed active sites with improved charge mobility and charge
separation. A Z-scheme heterojunction by a wet impregnation assisted
ultrasonic technique was constructed by LaCoO3 anchored
onto hollow tubular porous g-C3N4 formed after
the curling of flaked nanosheets into hollow tubes. Highest amount
of H2 was generated by 15 wt % of LaCoO3 dispersed
over porous g-C3N4 in the nanocomposite. The
Z-scheme heterojunction generated H2 (800 μmol g–1) which was 1.41 and 1.77 times higher than pristine
porous g-C3N4 and pristine LaCoO3, respectively, contributing to the improved visible light absorption
and reduced band gap, mass transfer, charge mobility, and charge separation.
The nanocomposite showed stability over three consecutive cycles.
Also, the nanocomposite generated CH4 by the simultaneous
occurrence of water splitting and photoreforming. The apparent quantum
efficiency of the nanocomposite was also calculated and estimated
to be 1.52 and 1.26 times improved over LaCoO3 and P-g-C3N4, respectively. Overall, this work gives insight
into less costly and simple Z-scheme heterojunctions for solar to
hydrogen conversion with high efficiency.
“…Also, there is no prominent peak detected for Co 3 O 4 , which proves that no significant Co was left unincorporated into the lattice of LaCoO 3 during pure perovskite phase formation. Moreover, B-g-C 3 N 4 and P-g-C 3 N 4 show the same characteristic Raman peaks at 707 cm –1 indicating the presence of a triazine ring, and 751 cm –1 shows the A1 vibrations of the triazine ring, while the breathing mode of the triazine ring is indicated by a Raman peak at 980 cm –1 . The vibrational mode of g-C 3 N 4 heterocycles is shown by Raman peaks at 474 and 1233 cm –1 .…”
La
x
Co
y
O3 perovskite dispersed porous three-dimensional (3D) g-C3N4 hollow nanotubes to construct a Z-scheme nanocomposite
were successfully synthesized via a wet impregnation assisted ultrasonic
approach and were used for photocatalytic H2 generation
in a liquid phase slurry photoreactor under visible light. A rhombohedral
distorted LaCoO3 perovskite with 1.70 eV narrow band gap
for improved optical properties was synthesized by the combination
of coprecipitation and a hydrothermal method. Additionally, two-dimensional
(2D) porous g-C3N4 with advantageous structural
features was synthesized by a novel, facile, and cost-effective technique
depicting exposed active sites with improved charge mobility and charge
separation. A Z-scheme heterojunction by a wet impregnation assisted
ultrasonic technique was constructed by LaCoO3 anchored
onto hollow tubular porous g-C3N4 formed after
the curling of flaked nanosheets into hollow tubes. Highest amount
of H2 was generated by 15 wt % of LaCoO3 dispersed
over porous g-C3N4 in the nanocomposite. The
Z-scheme heterojunction generated H2 (800 μmol g–1) which was 1.41 and 1.77 times higher than pristine
porous g-C3N4 and pristine LaCoO3, respectively, contributing to the improved visible light absorption
and reduced band gap, mass transfer, charge mobility, and charge separation.
The nanocomposite showed stability over three consecutive cycles.
Also, the nanocomposite generated CH4 by the simultaneous
occurrence of water splitting and photoreforming. The apparent quantum
efficiency of the nanocomposite was also calculated and estimated
to be 1.52 and 1.26 times improved over LaCoO3 and P-g-C3N4, respectively. Overall, this work gives insight
into less costly and simple Z-scheme heterojunctions for solar to
hydrogen conversion with high efficiency.
“…[18][19][20][21] This is due to the optimum band position of a-Fe 2 O 3 having a band gap of 2.1 eV. The synergistic effect of C 3 N 4 and a-Fe 2 O 3 in their Z-scheme heterojunction composites were used by various research groups to explore many applications in CO 2 reduction, 22,23 photocatalytic regeneration of reduced nicotinamide adenine dinucleotide, 24 degradation of organic pollutants, [25][26][27][28][29][30][31][32][33][34][35][36] and photocatalytic water oxidation. 37,38 Li et al designed an efficient photocatalyst, a-Fe 2 O 3 /g-C 3 N 4 , for water splitting hydrogen evolution.…”
Section: Introductionmentioning
confidence: 99%
“…46 Xu et al developed magnetically separable Fe 2 O 3 /g-C 3 N 4 , which degraded 96.7% RhB in 4 h. 47 Later, the photocatalytic degradation of p-nitrophenol using Fe 2 O 3 /g-C 3 N 4 was studied, which showed complete degradation within 6 h under visible light irradiation. 48 The photodegradation of methyl orange by magnetically separable g-C 3 N 4 /Fe 2 O 3 photocatalyst has been reported, which degrades 99% methyl orange in 120 min. 49 Metal-organic frameworks (MOFs) 50,51 have been explored as an excellent precursor or sacrificial template for the preparation of metal oxide or composites of metal oxides by thermolysis, for heterogeneous photocatalysis and electrocatalysis because of their high surface areas, catalytic active sites, controllable pore sizes, and nanostructures.…”
2D/1D heterojunction α-Fe2O3/C3N4 photocatalysts containing α-Fe2O3 microrods and polymeric carbon nitride flakes are synthesised through the calcination of Fe-based metal-organic frameworks and boost the visible light photocatalytic degradation of rhodamine B.
“…Raman peaks were also observed at ~220, ~480, ~708, ~760, and ~980 cm −1 for g-C 3 N 4 . The most intense peak of g-C 3 N 4 at ~708 cm −1 represented the s-triazine ring 50 and also consistent with FTIR results.Figure 2Full length XPS spectrum of mesoporous α-Fe 2 O 3 @g-C 3 N 4 -NCs and high resolution XPS spectra of N and Fe.Figure 3FTIR spectra of ( a ) mesoporous α-Fe 2 O 3 @g-C 3 N 4 -NCs and ( b ) α-Fe 2 O 3 -NPs.Figure 4Raman spectra of g-C 3 N 4 , mesoporous α-Fe 2 O 3 @g-C 3 N 4 -NCs and α-Fe 2 O 3 -NPs.…”
Mesoporous α-iron oxide@graphitized-carbon nitride nanocomposites (α-Fe2O3@g-C3N4-NCs) were synthesized using urea-formaldehyde (UF) resins at 400 °C/2 h. The mesoporous nature of the prepared nanocomposites was observed from electron microscopy and surface area measurements. The electrochemical measurements show the bifunctional nature of mesoporous α-Fe2O3@g-C3N4-NCs in electrolysis of water for oxygen evolution and oxygen reduction reactions (OER/ORR) using 0.5 M KOH. Higher current density of mesoporous α-Fe2O3@g-C3N4-NCs reveals the enhanced electrochemical performance compared to pure Fe2O3 nanoparticles (NPs). The onset potential, over-potential and Tafel slopes of mesoporous α-Fe2O3@g-C3N4-NCs were found lower than that of pure α-Fe2O3-NPs. Rotating disc electrode experiments followed by the K-L equation were used to investigate 4e− redox system. Therefore, the mesoporous α-Fe2O3@g-C3N4-NCs bifunctional electro-catalysts can be considered as potential future low-cost alternatives for Pt/C catalysts, which are currently used in fuel cells.
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