Facile Synthesis of Nanosheet-like CuO Film and its Potential Application as a High-Performance Pseudocapacitor Electrode

Nwanya, Assumpta C.; Obi, Daniel; Ozoemena, Kenneth I.; Osuji, R. U.; Awada, Chawki; Ruediger, Andréas; Mâaza, M.; Rosei, Federico; Ezema, Fabian I.

doi:10.1016/j.electacta.2016.03.064

Cited by 81 publications

(21 citation statements)

References 60 publications

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“…This powder also has a very high capacitive retaining of 88% in more than 1000 cycles. Likewise, Wang et al developed a Co 3 O 4 in GO nanocomposites with a well‐enhanced performance, this nanocomposite was produced from GO‐Co(OH) 2 in which its performance is far much better compared with cobalt alone, and Nwanya et al used simple successive ionic layer adsorption and reaction (SILAR) method and also obtained high‐performance Co 3 O 4 electrodes.…”

Section: Introductionmentioning

confidence: 99%

Conjugated NiO‐ZnO/GO nanocomposite powder for applications in supercapacitor electrodes material

et al. 2020

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Summary The nanocomposite of NiO‐ZnO/graphene oxide (GO) was synthesized for applications in supercapacitor electrodes material. GO was produced using the modified Hummers' method, and the nanocomposite of NiO‐ZnO/GO was synthesized using the co‐precipitation method. Thin films of nanocomposite powder were deposited on quartzite (glass) and fluorine‐doped tin oxide substrates by a drop casting technique. X‐ray diffraction revealed the crystallographic information of NiO‐ZnO/GO nanocomposites. The surface morphology and elemental composition were studied using a scanning electron microscopy and energy‐dispersive X‐ray spectroscopy, respectively. The electrochemical properties were examined using cyclic voltammetry in a 1.0 M solution of Na2SO4 electrolyte with a three‐electrode system. Moreover, the NiO‐ZnO/GO binary metal oxides nanocomposite based electrodes fabricated for supercapacitor delivered a high specific capacitance of 1690 F g−1 for 1:1/GO sample at a scan rate of 10 mV s−1 and has excellent conductivity due to reduced band gap energy range of 1.52‐1.79 eV and with electrodes resistance of 0.02 Ω. The absence of semicircle in the Nyquist plot denotes low charge transfer resistance of the electrodes. The highest energy densities obtained for 1:1/GO and 2:1/GO are 192 and 148 Wh kg−1, respectively, while the highest power density obtained for 1:1/GO and 2:1/GO are 8.46 and 7.42 W kg−1, respectively. Our study paves way for a facile, affordable, nontoxic, and fast way to synthesis binary transition metal oxides/GO‐based electrodes material for high‐performance supercapacitor.

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Section: Introductionmentioning

confidence: 99%

Conjugated NiO‐ZnO/GO nanocomposite powder for applications in supercapacitor electrodes material

et al. 2020

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“…These methods include thermal decomposition [24], atmospheric plasma jet [25], hydrothermal [26]. Other methods used are chemical bath deposition [27,28], SILAR [29] as well as electrochemical [30] amongst others. In as much as copper oxides prepared using some of these methods have shown desired properties, toxic chemicals and solvents that are dangerous to human health and the environment are used as reducing/ oxidizing agents.…”

Section: Introductionmentioning

confidence: 99%

Industrial textile effluent treatment and antibacterial effectiveness of Zea mays L. Dry husk mediated bio-synthesized copper oxide nanoparticles

Nwanya

Razanamahandry

Bashir

et al. 2019

Journal of Hazardous Materials

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Zea mays L. dry husk extract was used to bio synthesize copper oxide nanoparticles. Red coloured cubic Cu 2 O nanoparticles were obtained for the first time via this simple, eco-friendly, green synthesis route. The Cu 2 O nanoparticles were thermally oxidized to pure monoclinic CuO nanoparticles at 600 °C. The phases of the copper oxides were confirmed from the x-ray diffraction (XRD) studies. The nanoparticle sizes as obtained from high resolution transmission electron microscope (HRTEM) analysis range from 10 to 26 nm, 36-73 nm and 30−90 nm for the unannealed Cu 2 O, 300 °C and 600 °C annealed CuO respectively. The values of the bandgap energies obtained from diffuse reflectance of the nanoparticles are 2.0, 1.30 and 1.42 eV respectively for the unannealed, 300 °C, and 600 °C annealed copper oxide nanoparticles. The 600 °C annealed copper oxide nanoparticles showed 91% and 90% degradation ability for methylene blue dye (BM) and textile effluent (TE) respectively under visible light irradiation. While CuO_300 is more effective to inhibit the growth of Escherichia coli 518,133 and Staphylococcus aureus 9144, Cu 2 O is better for Pseudomonas aeruginosa and Bacillus licheniformis. The results confirm the photo-catalytic and anti-microbial effectiveness of the copper oxide nanoparticles.

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“…Copper oxides have been extensively studied in energy storage devices including supercapacitors and lithium‐ion batteries, because of their ease of preparation, low environmental impact and high electrochemical activity . In order to improve the electrode's performance, self‐supported materials have been created by directly growing the active material on the surface of the current collector ,.…”

Section: Introductionmentioning

confidence: 99%

“…This creates both a larger reactive surface area and a continuous electron transfer pathway, from the electrolyte to the active film and then to the conductive current collector, thus offering highly efficient electron transport kinetics ,,. Inspired by this idea, self‐supported copper oxides with different morphologies including 1D nanotubes/nanorods,,,, 2D nanosheets,, and nanofilms,, have been fabricated using various synthesis systems. Despite the versatility demonstrated by the reported preparation methods, most of these systems required the input of a certain copper salt precursor, such as copper nitrate,,, copper acetate .…”

Section: Introductionmentioning

confidence: 99%

“…Inspired by this idea, self‐supported copper oxides with different morphologies including 1D nanotubes/nanorods,,,, 2D nanosheets,, and nanofilms,, have been fabricated using various synthesis systems. Despite the versatility demonstrated by the reported preparation methods, most of these systems required the input of a certain copper salt precursor, such as copper nitrate,,, copper acetate . The use of copper salts inevitably increases the cost for the material preparation, especially if the synthesis is to be done at the industrial scale.…”

Section: Introductionmentioning

confidence: 99%

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Sodium‐Salt‐Promoted Growth of Self‐Supported Copper Oxides with Comparative Supercapacitive Properties

Chen

Huang

et al. 2017

ChemElectroChem

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In this work, we developed a facile hydrothermal system to synthesize self‐supported copper oxides with different nanostructures. In this system, we used copper foam as both the substrate and the copper source, and selected a wide range of sodium salts to serve as directing agents, promoting the formation of copper oxide with different nanostructures. We first show that, at 30 mM of sodium fluoride, we can successfully grow nanocubes on the copper foam substrate that comprise both CuO and Cu2O. Such a mixed composition is unique among the investigated salts. However, if a lower concentration of NaF or a different salt is used, Cu2O nanocrystals of different structures, such as nanoplatelets or irregular particles, can be obtained. When these samples were tested in supercapacitors, they demonstrated contrasting pseudocapacitive properties where the initial mixed Cu2O/CuO nanocube sample demonstrated a very stable reversible capacitance of about 400 mF cm−2 for 1600 cycles. This is significantly higher than that for the other samples, as well as advantageous compared to other copper‐oxide‐based electrode materials. The impedance analysis suggested that such a performance could be attributed to the low diffusion resistance of this sample.

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Facile Synthesis of Nanosheet-like CuO Film and its Potential Application as a High-Performance Pseudocapacitor Electrode

Cited by 81 publications

References 60 publications

Conjugated NiO‐ZnO/GO nanocomposite powder for applications in supercapacitor electrodes material

Conjugated NiO‐ZnO/GO nanocomposite powder for applications in supercapacitor electrodes material

Industrial textile effluent treatment and antibacterial effectiveness of Zea mays L. Dry husk mediated bio-synthesized copper oxide nanoparticles

Sodium‐Salt‐Promoted Growth of Self‐Supported Copper Oxides with Comparative Supercapacitive Properties

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