Effect of annealing temperature on morphology and structure of CuO nanowires grown by thermal oxidation method

Tran, Thi Ha; Nguyen, Manh Hong; Nguyen, T.P.; Dao, Vu Phuong Thao; Nguyên, Philippe; Nguyen, Viet Tuyen; Pham, Nguyen Hai; Le, Van Vu; Sai, Cong Doanh; Nguyen, Quang Minh; Nguyen, Trong Tam; Ho, Khac Hieu; Khoa, Doan Quoc

doi:10.1016/j.jcrysgro.2018.10.010

Cited by 20 publications

(7 citation statements)

References 16 publications

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“…Samples of smaller width of the rods show stronger and sharper Raman peaks which also shift to smaller wave numbers. From our previous study, it is noted that annealing at low temperature of around 400 and 450 o C in oxygen results in formation of nanorods of both cupric and cuprous phase with a characteristic peak at around 200 cm -1 [6,9,20]. However, Raman spectra of nanocrystalline CuO annealed in ozone ambient at all oxidation temperatures show only Ag and B 1 g characteristic peak of CuO.…”

Section: Resultsmentioning

confidence: 93%

“…Various physical and chemical methods have been proposed to synthesize CuO nanomaterials such as quick-precipitation [4], chemical reduction [7], electrochemical [8], microwave-irradiation [6], sonochemical [3], thermal oxidation of copper [9]. Even though a wide range of morphologies have been achieved by these methods such as nanocubes [10], nanospheres [11], nanoneedles [12], nanobelts [13], nanodisks [14], only few chemcial methods are available for construction of CuO nanowires or nanorods [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

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Preparation of CuO Nanorods by Thermal Oxidation in Ozone Ambient

Hà¹,

Cong²,

Hai³

et al. 2022

MaP

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CuO nanorods were prepared by thermal oxidation method in ozone ambient. The effect of annealing temprature in the range from 400 to 600 oC on morphology and structure of nanorods was studied thouroughly by scanning electron microscopy (SEM) and X-ray diffraction, combining with energy dispersive spectroscopy (EDS) and Raman spectroscopy. The results showed that annealing temprature strongly affected the structure and morphology of the produced CuO nanorods. The most uniform nanorods with highest crystal quality were obtained when annealing temperature is from 450 to 500 °C and annealing time was 2 h as suggested by SEM images together with Raman results.

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Section: Resultsmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Preparation of CuO Nanorods by Thermal Oxidation in Ozone Ambient

Hà¹,

Cong²,

Hai³

et al. 2022

MaP

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“…After loading Ag NPs by the The Raman spectrum of CuO showed three absorption peaks at 285, 336, and 619 cm −1 (Figure 2), of which the first peak was the A g vibration mode of CuO and the other two peaks were the B g vibration modes of CuO. 21 The Raman peaks of Ag 1.01% /CuO were shifted to lower wavenumbers of 282, 332, and 615 cm −1 , respectively, elucidating that loading Ag NPs changed the electronic structure of CuO.…”

Section: Resultsmentioning

confidence: 99%

Efficacious CO₂ Adsorption and Activation on Ag Nanoparticles/CuO Mesoporous Nanosheets Heterostructure for CO₂ Electroreduction to CO

et al. 2021

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It is an ongoing pursuit for researchers to precisely control the catalyst’s surface for high-performance CO2 electrochemical reduction (CO2ER). In this work, CuO mesoporous nanosheets (CuO MNSs) with rough edges decorated by small Ag nanoparticles (Ag NPs) with a tunable amount of Ag were synthesized on a Cu foil at normal atmospheric temperature through two-step solution-phase reactions for CO2ER to CO. In this special Ag NPs/CuO MNSs heterostructure, the mesoporous CuO NSs with rough edges favored gas infiltration, while decorated Ag NPs expanded the active sites for CO2 molecule adsorption. Ag NPs endowed Ag NPs/CuO MNSs with good electrical conductivity and promoted the adsorbed CO2 molecules to obtain electrons from the catalyst. Especially, the Ag–CuO interface stabilized the *COOH intermediate with strong bonding, which is important in boosting CO2ER to CO. The optimal Ag1.01%/CuO can catalyze CO2ER to CO with a Faradaic efficiency of 91.2% and a partial current density of 10.5 mA cm–2 at −0.7 V. Moreover, it exhibited prominent catalytic stability, retaining 97.8% of the initial current density and 97.6% of the original Faradaic efficiency for CO after 12 h of testing at −0.7 V. Notably, the Faradaic efficiency of CO on Ag1.01%/CuO can retain over 80% in the potential area from −0.6 to −0.9 V, embodying its high selectivity for CO. This work develops precious metal/metal oxide heterostructures with a low precious metal loading for efficacious CO2ER to CO and beyond.

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“…The synthesis of the CuO nanowire array based on a copper foam or plate by thermal oxidation treatment can be found in the literature. , Herein, brass mesh was chosen as the precursor to obtain the CuO nanowire array. Briefly, brass mesh was immersed in 10 wt % HCl solution (used as a chemical corrosive agent) and subsequently sonicated to remove its native oxide layer, and then the brass mesh was rinsed with deionized water and dried at room temperature.…”

Section: Methodsmentioning

confidence: 99%

Rational Design of NiZn_x@CuO Nanoarray Architectures for Electrocatalytic Oxidation of Methanol

Han

Yang

et al. 2023

ACS Appl. Mater. Interfaces

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Methanol oxidation reaction (MOR) in anodes is one of the significant aspects of direct methanol fuel cells (DMFCs), which also plays a critical role in achieving a carbon-neutral economy. Designing and developing efficient, cost-effective, and durable non-Pt group metal-based methanol oxidation catalysts are highly desired, but a gap still remains. Herein, we report well-defined hierarchical NiZn x @CuO nanoarray architectures as active electrocatalysts for MOR, synthesized by combining thermal oxidation treatment and magnetron sputtering deposition through a brass mesh precursor. After systematically evaluating the electrocatalytic performance of NiZn x @CuO nanoarray catalysts with different preparation conditions, we found that the NiZn1000@CuO (thermally oxidized at 500 °C for 2 h, nominal thickness of the NiZn alloy film is 1000 nm) electrode delivers a high current density of 449.3 mA cm–2 at 0.8 V for MOR in alkaline media as well as excellent operation stability (92% retention after 12 h). These outstanding MOR performances can be attributed to the hierarchical well-defined structure that can not only render abundant active sites and a synergistic effect to enhance the electrocatalytic activity but also can effectively facilitate mass and electron transport. More importantly, we found that partial Zn atoms could leach from the NiZn alloy, resulting in rough surface nanorods, which would further increase the specific surface area. These results indicate that the NiZn1000@CuO nanoarray architecture could be a promising Pt group metal alternative as an efficient, cost-effective, and durable anode catalyst for DMFCs.

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Effect of annealing temperature on morphology and structure of CuO nanowires grown by thermal oxidation method

Cited by 20 publications

References 16 publications

Preparation of CuO Nanorods by Thermal Oxidation in Ozone Ambient

Preparation of CuO Nanorods by Thermal Oxidation in Ozone Ambient

Efficacious CO₂ Adsorption and Activation on Ag Nanoparticles/CuO Mesoporous Nanosheets Heterostructure for CO₂ Electroreduction to CO

Rational Design of NiZn_x@CuO Nanoarray Architectures for Electrocatalytic Oxidation of Methanol

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Effect of annealing temperature on morphology and structure of CuO nanowires grown by thermal oxidation method

Cited by 20 publications

References 16 publications

Preparation of CuO Nanorods by Thermal Oxidation in Ozone Ambient

Preparation of CuO Nanorods by Thermal Oxidation in Ozone Ambient

Efficacious CO2 Adsorption and Activation on Ag Nanoparticles/CuO Mesoporous Nanosheets Heterostructure for CO2 Electroreduction to CO

Rational Design of NiZnx@CuO Nanoarray Architectures for Electrocatalytic Oxidation of Methanol

Contact Info

Product

Resources

About

Efficacious CO₂ Adsorption and Activation on Ag Nanoparticles/CuO Mesoporous Nanosheets Heterostructure for CO₂ Electroreduction to CO

Rational Design of NiZn_x@CuO Nanoarray Architectures for Electrocatalytic Oxidation of Methanol