Fabrication of CuFe2O4/α-Fe2O3 Composite Thin Films on FTO Coated Glass and 3-D Nanospike Structures for Efficient Photoelectrochemical Water Splitting

Hussain, Shabeeb; Hussain, Shazia; Waleed, Aashir; Tavakoli, Mohammad Mahdi; Wang, Zilong; Yang, Shihe; Fan, Zhiyong; Nadeem, Muhammad Arif

doi:10.1021/acsami.6b12460

Cited by 66 publications

(36 citation statements)

References 29 publications

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“…It showed that NG component makes CuFe 2 O 4 more regular. In addition, plane (002) assigned to N-doped graphene did not appear in the CuFe 2 O 4 /NG sample, because the amount of NG is very small in the CuFe 2 Figure 1. A wide-scan XPS spectrum of as-synthesized NG sample (A) and the high-resolution spectrum of N 1s in NG sample (B).…”

Section: X-ray Photoelectron Spectroscopic Characterizationmentioning

confidence: 97%

“…band of NG sheets can thereby be estimated as −0.10 eV based on its band gap of 1.50 eV and valence band of 1.40 eV measured in Figure 18B. Under consideration of the standard electrodes (E 0 for N2/NH3 redox is 0.057 V vs. NHE, E 0 for O2/H2O is 1.23 V vs. NHE), a Z-scheme mechanism can be suggested as demonstrated in Scheme 1 [2,8]. Scheme 1.…”

Section: Reaction Mechanismmentioning

confidence: 99%

“…One is through a series of · NH 2 , · NH, N 2 H x+y(x+y =0,1,2) intermediates, giving out N 2 as a consequence. The other is to form the HONH 2 In our case the ultraviolet-visible spectroscopic measurements displayed that there is not any absorption band from 200 nm to 260 nm except noise wave during the photocatalytic process as shown in Figure 11, suggesting neither nitrite nor nitrate were formed during the degradation process since NO 2 − and NO 3 − can generate the absorption peaks at 211 nm and 206 nm, respectively [34][35][36]. In order to confirm the product of oxidized ammonia, the detection of nitrogen gas (N2) was performed during the photocatalytic degradation of ammonia in the sealed photocatalytic reaction system mentioned previously, in which a 50 mL aqueous solution containing 100.0 mg/L NH3-N was irradiated under visible-near-infrared light, the mixed gas of oxygen and argon was cycled, and the released N2 was detected with gas chromatograph.…”

Section: Identification Of Productsmentioning

confidence: 99%

“…CuFe 2 O 4 is an interesting material with the band gap of 1.7 eV due to its unique electronic configuration of valence shell (Cu 3d 10 4s 1 ) [1]. It has been widely applied in magnetic memory, high-frequency devices, sensors, drug delivery, anode materials, and catalysts owing to its advantages of environmental benignity, moisture insensitive, high dispersion, high reactivity, low price, large abundance of Cu and easy separation with an external magnet [2][3][4][5]. CuFe 2 O 4 was coupled price, large abundance of Cu and easy separation with an external magnet [2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

“…It has been widely applied in magnetic memory, high-frequency devices, sensors, drug delivery, anode materials, and catalysts owing to its advantages of environmental benignity, moisture insensitive, high dispersion, high reactivity, low price, large abundance of Cu and easy separation with an external magnet [2][3][4][5]. CuFe 2 O 4 was coupled price, large abundance of Cu and easy separation with an external magnet [2][3][4][5]. CuFe2O4 was coupled to graphene [6], TiO2 [7], AgBr [8] and Ag3PO4 [9] to fabricate composites for degrading organic pollutants.…”

Section: Introductionmentioning

confidence: 99%

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Molecular-Level Understanding of Selectively Photocatalytic Degradation of Ammonia via Copper Ferrite/N-Doped Graphene Catalyst under Visible Near-Infrared Irradiation

et al. 2018

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Developing photocatalysts with molecular recognition function is very interesting and desired for specific applications in the environmental field. Copper ferrite/N-doped graphene (CuFe 2 O 4 /NG) hybrid catalyst was synthesized and characterized by surface photovoltage spectroscopy, X-ray powder diffraction, transmission electron microscopy, Raman spectroscopy, UV-Vis near-infrared diffuse reflectance spectroscopy and X-ray photoelectron spectroscopy. The CuFe 2 O 4 /NG catalyst can recognize ammonia from rhodamine B (RhB) in ammonia-RhB mixed solution and selectively degrade ammonia under visible near-infrared irradiation. The degradation ratio for ammonia reached 92.6% at 6 h while the degradation ratio for RhB was only 39.3% in a mixed solution containing 100.0 mg/L NH 3 -N and 50 mg/L RhB. Raman spectra and X-ray photoelectron spectra indicated ammonia adsorbed on CuFe 2 O 4 while RhB was adsorbed on NG. The products of oxidized ammonia were detected by gas chromatography, and results showed that N 2 was formed during photocatalytic oxidization. Mechanism studies showed that photo-generated electrons flow to N-doped graphene following the Z-scheme configuration to reduce O 2 dissolved in solution, while photo-generated holes oxidize directly ammonia to nitrogen gas.to graphene [6], TiO 2 [7], AgBr [8] and Ag 3 PO 4 [9] to fabricate composites for degrading organic pollutants. Wang and co-workers utilized CuFe 2 O 4 as a photocatalyst to selectively degrade methylene blue in the presence of methylene orange, rhodamine B and rhodamine 6G, and the authors attributed the selective degradation to the specific interaction of active sites of catalyst with the methylene blue molecule [10]. To the best of our knowledge, however, the coupling of CuFe 2 O 4 to nitrogen-doped graphene (NG) for the selective photocatalytic oxidization of NH 3 has not been reported.Graphene is a two-dimensional sp2-hybridized carbon material with unique properties such as excellent charge transport, outstanding transparency, huge specific surface area, high mechanical strength and superior thermal conductivity, so it was often used as a co-catalyst [11][12][13][14][15][16][17]. Moreover, molecular tailoring (nitrogen atoms were doped into graphene framework) can module its intrinsic properties to meet the rapidly increasing demand for practical applications in various fields. For example, nitrogen doping can tailor its electrical properties, open a band gap and allow it to show semiconducting properties. As a result, nitrogen doping can significantly improve the catalytic activity toward photocatalytic reactions due to the enhanced electron transportation from semiconductors to NG and the reduced recombination of the photogenerated electron-hole pairs [18][19][20]. In the work, we coupled CuFe 2 O 4 to NG to prepare CuFe 2 O 4 /NG hybrid catalyst, it is expected that the Cu-based hybrid catalyst can recognize ammonia via coordination effect since the formation constant of Cu(NH 3 ) 4 2+ approached 1.1 × 10 13 . This large constant implies...

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Section: X-ray Photoelectron Spectroscopic Characterizationmentioning

confidence: 97%

Section: Reaction Mechanismmentioning

confidence: 99%

Section: Identification Of Productsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Molecular-Level Understanding of Selectively Photocatalytic Degradation of Ammonia via Copper Ferrite/N-Doped Graphene Catalyst under Visible Near-Infrared Irradiation

et al. 2018

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Photoelectrochemical Hydrogen Evolution

Wang¹,

Wang²

2021

Solar‐to‐Chemical Conversion

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Template‐Assisted Fabrication of Nanostructured Arrays for Sensing Applications

Lei

2018

ChemPlusChem

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High sensitivity imposes strict requirements on a sensing platform, for which nanostructured arrays are promising candidates. The template‐assisted method is an effective strategy to prepare various nanostructured arrays, which are widely developed for different sensing applications. Herein, nanostructured array based sensing platforms prepared from four widely used templates, a colloidal monolayer, anodic aluminum oxide, block copolymer, and a nanoimprint mold, are reviewed. In a series of sensing applications (e.g., biosensing and gas sensing), the resulting nanostructure‐array‐based platforms are high sensitive owing to their advanced morphology features: 1) high‐density alignment of arrayed nanostructures, 2) high surface‐to‐volume ratio, and 3) convex‐rich morphology. In surface‐enhanced Raman spectroscopy (SERS) applications, noble‐metal particle arrays with high‐density alignment produce an enhanced SERS signal owing to a strong concentration of plasmonic resonance on the substrate. To sense biomolecules in solution and gaseous molecules, arrays with a high surface‐to‐volume ratio or convex‐rich morphology can sensitively respond to changes in the environment. Moreover, the nanostructure‐array‐based sensing platforms are divided into three types (0D, 1D, and 3D nanostructured arrays) to demonstrate the morphological origin of the sensing performances.

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Fabrication of CuFe₂O₄/α-Fe₂O₃ Composite Thin Films on FTO Coated Glass and 3-D Nanospike Structures for Efficient Photoelectrochemical Water Splitting

Cited by 66 publications

References 29 publications

Molecular-Level Understanding of Selectively Photocatalytic Degradation of Ammonia via Copper Ferrite/N-Doped Graphene Catalyst under Visible Near-Infrared Irradiation

Molecular-Level Understanding of Selectively Photocatalytic Degradation of Ammonia via Copper Ferrite/N-Doped Graphene Catalyst under Visible Near-Infrared Irradiation

Photoelectrochemical Hydrogen Evolution

Template‐Assisted Fabrication of Nanostructured Arrays for Sensing Applications

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