Design of preparation parameters for commendable photocatalytic properties in CuO nanostructures

Wang, Dagui; Song, Caixiong; Lv, Xiangzhou; Wang, Yongqian

doi:10.1007/s00339-016-0556-z

Cited by 8 publications

(8 citation statements)

References 37 publications

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“…The direct and indirect band gaps of the CuO film were extracted from Tauc plots of the absorbance spectrum and are found to be 2.84 and 1.25 eV respectively (see Figure S3). The indirect gap is consistent with literature reports, and the higher energy, direct band gap is consistent with literature reports for a polycrystalline bulk CuO band gap − with some quantum confinement shift. − …”

Section: Resultssupporting

confidence: 91%

Controlling Chemical Selectivity in Electrocatalysis with Chiral CuO-Coated Electrodes

et al. 2019

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This work demonstrates the chiral-induced spin selectivity effect for inorganic copper oxide films and exploits it to enhance the chemical selectivity in electrocatalytic water splitting. Chiral CuO films are electrodeposited on a polycrystalline Au substrate, and their spin filtering effect on electrons is demonstrated using Mott polarimetry analysis of photoelectrons. CuO is known to act as an electrocatalyst for the oxygen evolution reaction; however, it also generates side products such as H2O2. We show that chiral CuO is selective for O2; H2O2 generation is strongly suppressed on chiral CuO but is present with achiral CuO. The selectivity is rationalized in terms of the electron spin-filtering properties of the chiral CuO and the spin constraints for the generation of triplet oxygen. These findings represent an important step toward the development of all-inorganic chiral materials for electron spin filtering and the creation of efficient, spin-selective (photo)electrocatalysts for water splitting.

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Section: Resultssupporting

confidence: 91%

Controlling Chemical Selectivity in Electrocatalysis with Chiral CuO-Coated Electrodes

et al. 2019

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“…The 2D CuO NLs are generated from those one-dimensional CuO nanorods by an oriented attachment growth mechanism. In addition to the previous examples, there are other authors supporting the hypothesis of the Cu(OH) 2 nanowires or the CuO nanorods as fundamental units for the CuO NLs formation. The two reaction conditions carried out in our work agree with the general and most accepted intermediate that will form the cupric oxide, cupric hydroxide (Cu(OH) 2 ).…”

Section: Resultssupporting

confidence: 61%

“…The selective adsorption of OH − ions on the (001) surfaces fully suppresses assembly on this plane, thus leading to the net 2D NL morphology. In 2015, Cao and co-workers 53 proposed that 54 or the CuO nanorods 55 as fundamental units for the CuO NLs formation. The two reaction conditions carried out in our work agree with the general and most accepted intermediate that will form the cupric oxide, cupric hydroxide (Cu(OH) 2 ).…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Cupric Oxide Nanoleaves for the Oxidative Degradation of Methyl Orange without Heating or Light

Londoño-Calderón

Menchaca-Nal

François

et al. 2020

ACS Appl. Nano Mater.

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Low-cost 2D cupric oxide nanoleaves (CuO NLs) are straightforwardly synthesized at room temperature by precipitation varying the addition method of the alkali. No further treatments are necessary to obtain high purity NLs. The effect of the different addition methods of alkali on the morphological, structural, vibrational, and optical properties is studied by field emission scanning electron microscopy (FESEM), X-ray diffraction (XRD), and Fourier transform infrared (FT-IR) and ultraviolet−visible (UV−vis) spectroscopies. NLs grown by alkali addition in a dropwise manner are on average 281, 178, and 17 nm long, wide, and thick, respectively, and composed of crystallites of 14 nm corresponding to the crystallographic planes (1̅ 11)/ ( 002) and ( 111)/(200). NLs obtained by this method agglomerate forming flower-like nanostructures, exhibiting indirect band gap energy of 1.21 eV. NLs grown by alkali addition in a one-step manner are on average significantly bigger, being 602, 219, and 26 nm long, wide, and thick, respectively, composed of crystallites of 19 and 16 nm corresponding to the crystallographic planes (1̅ 11)/(002) and ( 111)/(200), respectively. These NLs agglomerate randomly with no predominant form observed, exhibiting indirect band gap energy of 1.39 eV. The addition method of alkali does not influence the average crystallite size of NLs, whereas the microstrain distribution is sensitive to the initial concentration of OH − ions. Our results suggest that an indirect electronic transition between the valence and conduction bands might be more feasible than a direct one. NLs grown by the one-step method present the highest efficiency as catalyst toward catalytic oxidative degradation of the methyl orange dye with no heating and without the influence of light. Finally, this catalyst is easily recycled several times preserving its high catalytic activity.

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“…There are several methods for the synthesis of CuO NSs in the literature, such as hydrothermal production [ 16 , 17 ], microwave-mediated synthesis [ 18 ], aerosol pyrolysis [ 19 ], electrochemical deposition [ 20 , 21 ], etc. These methods can be divided into two groups: the first group includes methods for direct synthesis of CuO, and the second is based on the oxidation of copper nanostructures with various reagents or methods that yield an oxide form.…”

Section: Introductionmentioning

confidence: 99%

Cu/CuO Composite Track-Etched Membranes for Catalytic Decomposition of Nitrophenols and Removal of As(III)

et al. 2020

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One of the promising applications of nanomaterials is to use them as catalysts and sorbents to remove toxic pollutants such as nitroaromatic compounds and heavy metal ions for environmental protection. This work reports the synthesis of Cu/CuO-deposited composite track-etched membranes through low-temperature annealing and their application in catalysis and sorption. The synthesized Cu/CuO/poly(ethylene terephthalate) (PET) composites presented efficient catalytic activity with high conversion yield in the reduction of nitro aryl compounds to their corresponding amino derivatives. It has been found that increasing the time of annealing raises the ratio of the copper(II) oxide (CuO) tenorite phase in the structure, which leads to a significant increase in the catalytic activity of the composites. The samples presented maximum catalytic activity after 5 h of annealing, where the ratio of CuO phase and the degree of crystallinity were 64.3% and 62.7%, respectively. The catalytic activity of pristine and annealed composites was tested in the reduction of 4-nitroaniline and was shown to remain practically unchanged for five consecutive test cycles. Composites annealed at 140 °C were also tested for their capacity to absorb arsenic(III) ions in cross-flow mode. It was observed that the sorption capacity of composite membranes increased by 48.7% compared to the pristine sample and reached its maximum after 10 h of annealing, then gradually decreased by 24% with further annealing.

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Design of preparation parameters for commendable photocatalytic properties in CuO nanostructures

Cited by 8 publications

References 37 publications

Controlling Chemical Selectivity in Electrocatalysis with Chiral CuO-Coated Electrodes

Controlling Chemical Selectivity in Electrocatalysis with Chiral CuO-Coated Electrodes

Cupric Oxide Nanoleaves for the Oxidative Degradation of Methyl Orange without Heating or Light

Cu/CuO Composite Track-Etched Membranes for Catalytic Decomposition of Nitrophenols and Removal of As(III)

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