High photocatalytic activity and stability for decomposition of gaseous acetaldehyde on TiO2/Al2O3 composite films coated on foam nickel substrates by sol-gel processes

Hu, Hai; Xiao, Wen‐Jing; Yuan, Jian; Shi, Jianwei; He, Dannong; Shangguan, Wenfeng

doi:10.1007/s10971-007-1650-7

Cited by 35 publications

(27 citation statements)

References 33 publications

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“…Six diffraction peaks in NiCu coating (red curve in Figure a) are indexed to Cu (111), Ni (111), Cu (200), Ni (200), Cu (220), and Ni (220) reflections of face‐centered cubic (fcc) structure, respectively, confirming the phase separation and the formation of two‐phase NiCu alloy. For the Ni(Cu) coating (blue curve in Figure a), only three diffraction peaks at 44.3°, 51.6°, and 76.2° are detected, which match well with the (111), (200), and (220) planes of face‐centered cubic nickel (JCPDS, No.70‐0989) . Of note, no characteristic diffraction peaks belonging to metal oxides or hydroxides of Ni and Cu, or their composites are detected, which further confirms that the as‐obtained Ni(Cu) coatings on NF are metallic Ni, in accordance with the TEM results.…”

Section: Resultssupporting

confidence: 64%

Synergistic Nanotubular Copper‐Doped Nickel Catalysts for Hydrogen Evolution Reactions

Sun

Dong

Wang

et al. 2018

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Developing highly active electrocatalysts with low cost and high efficiency for hydrogen evolution reactions (HERs) is of great significance for industrial water electrolysis. Herein, a 3D hierarchically structured nanotubular copper-doped nickel catalyst on nickel foam (NF) for HER is reported, denoted as Ni(Cu), via facile electrodeposition and selective electrochemical dealloying. The as-prepared Ni(Cu)/NF electrode holds superlarge electrochemical active surface area and exhibits Pt-like electrocatalytic activity for HER, displaying an overpotential of merely 27 mV to achieve a current density of 10 mA cm and an extremely small Tafel slope of 33.3 mV dec in 1 m KOH solution. The Ni(Cu)/NF electrode also shows excellent durability and robustness in both continuous and intermittent bulk water electrolysis. Density functional theory calculations suggest that Cu substitution and the formation of NiO on the surface leads to more optimal free energy for hydrogen adsorption. The lattice distortion of Ni caused by Cu substitution, the increased interfacial activity induced by surface oxidation of nanoporous Ni, and numerous active sites at Ni atom offered by the 3D hierarchical porous structure, all contribute to the dramatically enhanced catalytic performance. Benefiting from the facile, scalable preparation method, this highly efficient and robust Ni(Cu)/NF electrocatalyst holds great promise for industrial water-alkali electrolysis.

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Section: Resultssupporting

confidence: 64%

Synergistic Nanotubular Copper‐Doped Nickel Catalysts for Hydrogen Evolution Reactions

Sun

Dong

Wang

et al. 2018

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123

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“…Electrophoretic Deposition (EPD). Chemical deposition methods include spray coating, dip coating, spray pyrolysis, hydrothermal and sol-gel processing [19][20][21][22][23][24][25]. Among the aforementioned methods, chemical deposition methods stand out as more suitable due to lower economic and practical demands for the deposition onto unevenly shaped substrates, such as ceramic foam.…”

Section: Advanced Deposition Methods Include Chemical Vapor Depositiomentioning

confidence: 99%

Titania-Coated Alumina Foam Photocatalyst for Memantine Degradation Derived by Replica Method and Sol-Gel Reaction

et al. 2020

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In the present work, alumina (Al2O3) foam was prepared by the replica method where a polyurethane (PU) foam (30 pores per inch (ppi)) template was impregnated with a 60 wt.% Al2O3 suspension. Sintered Al2O3 foam was used as substrate for the deposition of sol-gel derived titania (TiO2) film using dip coating. For the preparation of TiO2 sol, titanium(IV) isopropoxide (Ti-iPrOH) was used as the precursor. The common problem of qualification and quantification of a crystalline coating on a highly porous 3D substrate with an uneven surface was addressed using a combination of different structural characterization methods. Using Powder X-ray Diffraction (PXRD) and synchrotron Grazing Incidence X-ray Diffraction (GIXRD) on bulk and powdered Al2O3 foam and TiO2-coated Al2O3 foam samples, it was determined Al2O3 foam crystallizes to corundum and coating to anatase, which was also confirmed by Fourier Transformed Infrared Spectroscopy (FTIR). Scanning Electron Microscopy with Energy Dispersive X-ray Spectroscopy (SEM/EDS) revealed the structural and microstructural properties of the substrate and coating. Differential Thermal Analysis (DTA) and Thermogravimetric Analysis (TGA) were used to clarify the evolution of the porous microstructure. The Al2O3-TiO2 composite was evaluated as a photocatalyst candidate for the degradation of the micropollutant medication memantine. The degradation rate was monitored using a light-emitting diode (LED) lamp operating at electromagnetic (EM) wavelength of 365 nm. The photocatalytic activity of sol-gel-derived TiO2 film immobilized on the Al2O3 foam was compared with commercially available TiO2 nanoparticles, P25-Degussa, in the form of a suspension. The levels of memantine were monitored by High-Performance Liquid Chromatography–Tandem Mass Spectrometry (HPLC–MS/MS). The efficiency and rate of the memantine photodegradation by suspended TiO2 nanoparticles is higher than the TiO2-coated Al2O3 foam. But, from the practical point of view, TiO2-coated Al2O3 foam is more appropriate as a valuable photocatalytic composite material.

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“…Furthermore, binding Al 2 O 3 with TiO 2 renders recovery of the photocatalyst nanoparticles by centrifugation feasible; generally, nylon filter membranes are required to recover pristine nanocrystalline TiO 2 . Binding of Al 2 O 3 with TiO 2 does not significantly modify the band gap energy [7,8,11] but enhances the adsorption of dyes [8,12,13] and thus the photocatalytic activity [7,8,[14][15][16]. TiO 2 deposited Al 2 O 3 films [14,[16][17][18][19][20] or membranes [21] or flakes [10] or powder [9,22], TiO 2 supported on Al 2 O 3 [23] and TiO 2 /Al 2 O 3 binary oxides [24][25][26] or nanocomposites [7] have been synthesized for application as photocatalysts.…”

Section: Introductionmentioning

confidence: 99%

“…Binding of Al 2 O 3 with TiO 2 does not significantly modify the band gap energy [7,8,11] but enhances the adsorption of dyes [8,12,13] and thus the photocatalytic activity [7,8,[14][15][16]. TiO 2 deposited Al 2 O 3 films [14,[16][17][18][19][20] or membranes [21] or flakes [10] or powder [9,22], TiO 2 supported on Al 2 O 3 [23] and TiO 2 /Al 2 O 3 binary oxides [24][25][26] or nanocomposites [7] have been synthesized for application as photocatalysts. Dip-coating [9,18,19,27], atmospheric plasma spraying [22], sol-gel [7,8,10,12,[14][15][16]20,[24][25][26][28][29][30], pyrolysis [21] and wet impregnation [23,31] methods ar...…”

Section: Introductionmentioning

confidence: 99%

“…Atmospheric plasma spraying technique has also been employed to prepare Al 2 O 3 -TiO 2 composite [22]. The pollutants degraded include phenol [19,32], nitrophenol [23,31], 2,4-dichlorophenoxyacetic acid (2,4-D) [7], acetaldehyde [16], acetone [22], methyl ethyl ketone [9], benzamide [18], styrene [10], salicylic acid [21], humic acid [33], ammonia [26], nitric oxide [24] and dyes [12,17,20,25,30]. A thin coating of Al 2 O 3 over TiO 2 /Pt enhances the photocatalytic production of hydrogen [34].…”

Section: Introductionmentioning

confidence: 99%

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Absorption, emission, charge transfer resistance and photocatalytic activity of Al2O3/TiO2 core/shell nanoparticles

Karunakaran

Magesan

Gomathisankar

et al. 2015

Superlattices and Microstructures

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High photocatalytic activity and stability for decomposition of gaseous acetaldehyde on TiO2/Al2O3 composite films coated on foam nickel substrates by sol-gel processes

Cited by 35 publications

References 33 publications

Synergistic Nanotubular Copper‐Doped Nickel Catalysts for Hydrogen Evolution Reactions

Synergistic Nanotubular Copper‐Doped Nickel Catalysts for Hydrogen Evolution Reactions

Titania-Coated Alumina Foam Photocatalyst for Memantine Degradation Derived by Replica Method and Sol-Gel Reaction

Absorption, emission, charge transfer resistance and photocatalytic activity of Al2O3/TiO2 core/shell nanoparticles

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