Gas–Liquid Cold Plasma for Synthesizing Copper Hydroxide Nitrate Nanosheets with High Adsorption Capacity

Di, Lanbo; Duan, Dongzhi; Zhan, Zhibin; Zhang, Xiuling

doi:10.1002/admi.201600760

Cited by 19 publications

(5 citation statements)

References 51 publications

(67 reference statements)

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“…Because STEM observation showed no large particles, no Tyndall phenomenon was observed, and colloid was stable for 1 year without sedimentation; it is assumed that all particles in LAL-Cu colloid was converted to small particles by LAAL. Cu-based nanoparticles have been synthesized by various methods; ,− however, although monodispersed nanoparticles have been fabricated, Cu-based nanoparticles with sizes as small as those in the present study have not been reported. The mechanism to produce these very small nanoparticles has been discussed as below. , In the case of LAL, a high density plasma is produced because the expansion of the plasma induced by LAL is confined by the liquid (confinement effect) unlike the free expansion in a vacuum, − which results in a high collision possibility.…”

Section: Resultsmentioning

confidence: 78%

Low-Overpotential Electrochemical Water Oxidation Catalyzed by CuO Derived from 2 nm-Sized Cu₂(NO₃)(OH)₃ Nanoparticles Generated by Laser Ablation at the Air–Liquid Interface

Nishi

Sato

Arai

et al. 2020

ACS Appl. Energy Mater.

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A CuO-based water oxidation electrocatalyst that operates at a low overpotential without strong alkaline conditions was developed using a laser ablation process. A two-step laser ablation, laser ablation of Cu powder in liquid (LAL) followed by laser ablation at the air–liquid interface (LAAL), enabled the preparation of a mixture of 2 nm-sized orthorhombic (gerhardtite) and metastable monoclinic Cu2(NO3)(OH)3 colloidal nanoparticles. Electrodes in which the colloidal nanoparticles were deposited as a precursor on carbon paper (CP) formed the CuO-based catalyst after pre-electrolysis (LAAL-CuO/CP), and the electrodes catalyzed electrochemical water oxidation in 1.0 M Na2CO3 (pH 11.3) with a potential of ∼1.53 V versus RHE. This value was lower than the reference electrodes of Cu, Cu2O, and CuO/CP and is the lowest among previously reported Cu-based water oxidation electrocatalysts. A current density over 10 mA/cm2 was achieved at 1.77 V versus RHE in the 1.0 M Na2CO3 solution, which is competitive with best CuO catalyst.

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Section: Resultsmentioning

confidence: 78%

Low-Overpotential Electrochemical Water Oxidation Catalyzed by CuO Derived from 2 nm-Sized Cu₂(NO₃)(OH)₃ Nanoparticles Generated by Laser Ablation at the Air–Liquid Interface

Nishi

Sato

Arai

et al. 2020

ACS Appl. Energy Mater.

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“…The characteristic peaks were observed in the XRD patterns of the unheated samples prepared from the solutions of pH 3.07, pH 3.90, and pH 4.57 on the Ag-deposited TiO 2 films during the UV irradiation, as shown in Figure 1. All the samples exhibited peaks at 2θ = 12.8 • and 25.7 • assigned to the (001) and (200) planes, respectively, of Cu 2 (OH) 3 (NO 3 ), i.e., layered copper hydroxide (LCH) nitrate [21,22]. CuO was not observed under the present conditions similar to the layered zinc hydroxide (LZH) nitrate in the case of the ZnO formation [14,15].…”

Section: Characterization Of the Film Surfacementioning

confidence: 75%

Formation of CuO on TiO2 Surface Using its Photocatalytic Activity

Nishikiori

Harata²,

Yamaguchi³

et al. 2019

Catalysts

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Some co-catalyst nanoparticles can enhance the activity of photocatalysts due to prolonging the charge separation lifetime by promoting the electron or hole transfer. CuO particles were prepared from an aqueous solution of copper (II) nitrate at 351 K on a TiO2 surface by a photocatalytic reaction and heating at 573 or 673 K. The amount and size of the particles deposited during the photocatalytic reaction can be controlled by changing the amount of the irradiated photons. The CuO crystals with about 50−250 nm-sized particles were formed. Nitrate ions were reduced to nitrite ions in the solution by the photocatalytic activity of the TiO2, and water was simultaneously transformed into hydroxide ions. An increase in the basicity on the TiO2 surface induced formation of a copper hydroxide. The copper hydroxide was subsequently dehydrated and transformed into CuO by heating. The TiO2 loading of a small amount of CuO demonstrated a higher photocatalytic activity for methylene blue degradation compared to the original TiO2 due to the electron transfer from the TiO2 conduction bands to the CuO conduction band.

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“…There is no obvious difference between them. Cu2p XPS spectra (Figure 5c) present the main peaks of copper, and the satellite peaks corresponding to copper (II) were observed in all four samples [48]. The Cu2p3/2 spectra in CO-240 can be deconvoluted into two peaks at 933.7 eV and 933.0 eV, corresponding to Cu (II) and Cu (I) due to the reduction of CO.…”

Section: Effect Of Activating Atmosphere On Cubtc Catalystsmentioning

confidence: 93%

Thermal Activation of CuBTC MOF for CO Oxidation: The Effect of Activation Atmosphere

Zhang

Zhan

et al. 2017

Catalysts

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High performance catalysts for carbon monoxide (CO) oxidation were obtained through thermal activation of a CuBTC (BTC: 1,3,5-benzenetricarboxylic acid) metal-organic framework (MOF) in various atmospheres. X-ray diffraction (XRD), X-ray photonelectron spectroscopy (XPS), N 2 adsorption-desorption measurement, and field emission scanning electron microscopy (FESEM) were adopted to characterize the catalysts. The results show that thermal activation by reductive H 2 may greatly destroy the structure of CuBTC. Inert Ar gas has a weak influence on the structure of CuBTC. Therefore, these two catalysts exhibit low CO oxidation activity. Activating with O 2 is effective for CuBTC catalysts, since active CuO species may be obtained due to the slight collapse of CuBTC structure. The highest activity is obtained when activating with CO reaction gas, since many pores and more effective Cu 2 O is formed during the thermal activation process. These results show that the structure and chemical state of coordinated metallic ions in MOFs are adjustable by controlling the activation conditions. This work provides an effective method for designing and fabricating high performance catalysts for CO oxidation based on MOFs.

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Gas–Liquid Cold Plasma for Synthesizing Copper Hydroxide Nitrate Nanosheets with High Adsorption Capacity

Cited by 19 publications

References 51 publications

Low-Overpotential Electrochemical Water Oxidation Catalyzed by CuO Derived from 2 nm-Sized Cu₂(NO₃)(OH)₃ Nanoparticles Generated by Laser Ablation at the Air–Liquid Interface

Low-Overpotential Electrochemical Water Oxidation Catalyzed by CuO Derived from 2 nm-Sized Cu₂(NO₃)(OH)₃ Nanoparticles Generated by Laser Ablation at the Air–Liquid Interface

Formation of CuO on TiO2 Surface Using its Photocatalytic Activity

Thermal Activation of CuBTC MOF for CO Oxidation: The Effect of Activation Atmosphere

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Gas–Liquid Cold Plasma for Synthesizing Copper Hydroxide Nitrate Nanosheets with High Adsorption Capacity

Cited by 19 publications

References 51 publications

Low-Overpotential Electrochemical Water Oxidation Catalyzed by CuO Derived from 2 nm-Sized Cu2(NO3)(OH)3 Nanoparticles Generated by Laser Ablation at the Air–Liquid Interface

Low-Overpotential Electrochemical Water Oxidation Catalyzed by CuO Derived from 2 nm-Sized Cu2(NO3)(OH)3 Nanoparticles Generated by Laser Ablation at the Air–Liquid Interface

Formation of CuO on TiO2 Surface Using its Photocatalytic Activity

Thermal Activation of CuBTC MOF for CO Oxidation: The Effect of Activation Atmosphere

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Low-Overpotential Electrochemical Water Oxidation Catalyzed by CuO Derived from 2 nm-Sized Cu₂(NO₃)(OH)₃ Nanoparticles Generated by Laser Ablation at the Air–Liquid Interface

Low-Overpotential Electrochemical Water Oxidation Catalyzed by CuO Derived from 2 nm-Sized Cu₂(NO₃)(OH)₃ Nanoparticles Generated by Laser Ablation at the Air–Liquid Interface