Versatile synthesis of rectangular shaped nanobat-like CuO nanostructures by hydrothermal method; structural properties and growth mechanism

Dar, Mushtaq Ahmad; Ahsanulhaq, Q.; Kim, Y.S.; Sohn, Jung Min; Kim, W.B.; Shin, Hyung‐Shik

doi:10.1016/j.apsusc.2009.02.002

Cited by 176 publications

(75 citation statements)

References 39 publications

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“…Such a significant influence of Cu on the Raman spectrum may be attributed to the incorporation of Cu in the cobalt spinel, in agreement with previous results [40]. Accordingly, the other two bands of 21 spinel are probably not discerned because they overlap with different Cu-O vibration modes in the spinel structure or in segregated copper oxide phases, which show vibration bands between 500 and 635 cm -1 [51,52].…”

Section: In Situ Raman Spectroscopy Study Of Cn -Electro-oxidationsupporting

confidence: 90%

Electrocatalytic oxidation of cyanide on copper-doped cobalt oxide electrodes

Berenguer

Rosa-Toro

Quijada

et al. 2017

Applied Catalysis B: Environmental

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Copper and copper oxides are well-known excellent catalysts in several chemical processes, but their low mechanical and electrochemical stability restrict their direct utilization as electrodes in electrolytic processes. In this work, the incorporation of copper into cobalt oxide (Cu x Co 3-x O 4 ) is presented as an excellent approach to obtain highly active and robust copper-based electrocatalysts. Particularly, the electrocatalytic performance of Ti-supported Cu x Co 3-x O 4 electrodes (with 0 ≤ x ≤ 1.5) has been studied for the oxidation of cyanide in alkaline media.Cyclic voltammetry and electrolysis runs show an outstanding effect of Cu on the activity, efficiency and kinetics of spinel Cu x Co 3-x O 4 electrodes for CN − electro-oxidation. Despite being active oxides with high activity towards water oxidation, copper saturated (x = 1.0) and oversaturated (x = 1.5) spinels exhibit unprecedented 100 % current efficiencies for the electrooxidation of CN − in aqueous electrolyte. In-situ surface enhanced Raman spectroscopy (SERS) reveals the specific adsorption of CN − ions on surface Cu species to be involved in the electrocatalytic oxidation mechanism. This electrocatalytic activity has been attributed to surface Cu(II) in the spinel lattice. Furthermore, the Cu x Co 3-x O 4 electrodes also display high

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Section: In Situ Raman Spectroscopy Study Of Cn -Electro-oxidationsupporting

confidence: 90%

Electrocatalytic oxidation of cyanide on copper-doped cobalt oxide electrodes

Berenguer

Rosa-Toro

Quijada

et al. 2017

Applied Catalysis B: Environmental

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“…Hydrothermal method has sparked much interest in recent years, due to its operational simplicity, and capability for large-scale production [32][33][34][35]. After the hydrothermal process of assembling the functionalized MWCNTs with Fe 3 O 4, powder X-ray diffraction patterns (XRD) of the water-soluble CNTs and products were recorded (see Fig.…”

Section: Resultsmentioning

confidence: 99%

Carbon nanotubes/magnetite hybrids prepared by a facile synthesis process and their magnetic properties

Zhang

Natsuki

et al. 2009

Applied Surface Science

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In this paper, a facile synthesis process is proposed to prepare multi-walled carbon nanotubes/magnetite (MWCNTs/Fe 3 O 4 ) hybrids. The process involves two steps: 1) water-soluble CNTs are synthesized by one-pot modification using potassium persulfate (KPS) as oxidant. 2) Fe 3 O 4 is assembled along the treated CNTs by employing a facile hydrothermal process with the presence of hydrazine hydrate as the mineralizer. The treated CNTs can be easily dispersed in aqueous solvent. Moreover, X-ray photoelectron spectroscopy (XPS) analysis reveals that several functional groups such as potassium carboxylate (-COOK), carbonyl (-C=O) and hydroxyl (-C-OH) groups are formed on the nanotube surfaces. The MWCNTs/Fe 3 O 4 hybrids are characterized with respect to crystal structure, morphology, element composition and magnetic property by x-ray diffraction (XRD), transmission electron microscopy (TEM), XPS and superconducting quantum interference device (SQUID) magnetometer. XRD and TEM results show that the Fe 3 O 4 nanoparticles with diameter in the range of 20-60 nm were firmly assembled on the nanotube surface. The magnetic property investigation indicated that the CNTs/Fe 3 O 4 hybrids exhibit a ferromagnetic behavior and possess a saturation magnetization of 32.2 emu/g. Further investigation indicates that the size of assembled Fe 3 O 4 nanoparticles can be turned by varying experiment factors. Moreover, a probable growth mechanism for the preparation of CNTs/Fe 3 O 4 hybrids was discussed.

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“…However, the use of more sophisticated functionals 52,60,[90][91][92][93] allows for the reproduction of the triclinic structure and good agreement with experiments on structural and vibrational data [94][95][96][97] (see Table 2). …”

Section: Cuo Bulk Propertiesmentioning

confidence: 99%

Atomistic details of oxide surfaces and surface oxidation: the example of copper and its oxides

Gattinoni

Michaelides

2015

Surface Science Reports

279

258

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The oxidation and corrosion of metals are fundamental problems in materials science and technology that have been studied using a large variety of experimental and computational techniques. Here we review some of the recent studies that have led to significant advances in our atomic-level understanding of copper oxide, one of the most studied and better understood metal oxides. We show that a good atomistic understanding of the physical characteristics of cuprous (Cu 2 O) and cupric (CuO) oxide and of some key processes of their formation has been obtained. Indeed, the growth of the oxide has been proven to be epitaxial with the surface and to proceed, in most cases, through the formation of oxide nano-islands which, with continuous oxygen exposure, grow and eventually coalesce. We also show how electronic structure calculations have become increasingly useful in helping to characterise the structures and energetics of various Cu oxide surfaces. However a number of challenges remain. For example, it is not clear under which conditions the oxidation of copper in air at room temperature (known as native oxidation) leads to the formation of a cuprous oxide film only, or also of a cupric overlayer. Moreover, the atomistic details of the nucleation of the oxide islands are still unknown. We close our review with a perspective on future work and discuss how recent advances in experimental techniques, bringing greater temporal and spatial resolution, along with improvements in the accuracy, realism and timescales achievable with computational approaches make it possible for these questions to be answered in the near future.

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Versatile synthesis of rectangular shaped nanobat-like CuO nanostructures by hydrothermal method; structural properties and growth mechanism

Cited by 176 publications

References 39 publications

Electrocatalytic oxidation of cyanide on copper-doped cobalt oxide electrodes

Electrocatalytic oxidation of cyanide on copper-doped cobalt oxide electrodes

Carbon nanotubes/magnetite hybrids prepared by a facile synthesis process and their magnetic properties

Atomistic details of oxide surfaces and surface oxidation: the example of copper and its oxides

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