Preparation and supercapacitance of CuO nanosheet arrays grown on nickel foam

Wang, Guiling; Huang, Jichun; Chen, Shuli; Gao, Yinyi

doi:10.1016/j.jpowsour.2011.02.049

Cited by 362 publications

(167 citation statements)

References 27 publications

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“…The plateau during the charging process lasts longer than the discharging, resulting in a low coulombic efficiency. A similar coulombic efficiency was also reported in the case of CuO [63], which is attributed to the inevitable transformation of cupric oxide into hydroxide in an alkaline solution [64,65]. In addition, the charging/discharging voltage is within the potential range of -0.8-0 V (Fig.…”

Section: Resultssupporting

confidence: 78%

Direct synthesis of RGO/Cu2O composite films on Cu foil for supercapacitors

Dong

Wang

Zhao

et al. 2014

Journal of Alloys and Compounds

111

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Reduced graphene oxide/cuprous oxide (RGO/Cu2O) composite films were directly synthesized on the surface of copper foil substrates through a straight redox reaction between GO and Cu foil via a hydrothermal approach. Characterization of the resultant composites with X-ray diffraction, Raman spectroscopy, X-ray photoelectron spectroscopy, and field emission scanning electron microscope (FESEM) confirms the formation of Cu2O and reduction of GO, in which Cu2O nanoparticles were well covered by RGO. The resultant composites (referred to as RGO/Cu2O/Cu) were directly used as electrodes for supercapacitors, and their electrochemical performance was assessed by cyclic voltammetry (CV), galvanostatic charge-discharge (GCD), and electrochemical impedance spectrometry (EIS) in 1 M KOH aqueous solution. A specific capacitance of 98.5 F g−1 at 1 A g−1 was obtained, which is much higher than that of pure Cu2O prepared under the same conditions, due to the presence of RGO. Keywordssupercapacitors, synthesis, rgo, cu2o, composite, films, cu, foil, direct Disciplines Engineering | Physical Sciences and Mathematics Publication DetailsDong, X., Wang, K., Zhao, C., Qian, X., Chen, S., Li, Z., Liu, H. & Dou, S. (2014) at 1 A g -1 was obtained, which is much higher than that of pure Cu 2 O prepared under the same conditions, due to the presence of RGO.

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Section: Resultssupporting

confidence: 78%

Direct synthesis of RGO/Cu2O composite films on Cu foil for supercapacitors

Dong

Wang

Zhao

et al. 2014

Journal of Alloys and Compounds

111

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“…As shown in gure, the area swept by the CV curve increases with increasing KOH concentration. 52 The charges corresponding to anodic and cathodic peak increase with increasing KOH concentration. These effects show that a higher specic capacitance can be achieved with an increase in electrolyte concentration.…”

Section: Resultsmentioning

confidence: 98%

Facile synthesis of Cu₂O microstructures and their morphology dependent electrochemical supercapacitor properties

2016

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In this study, Cu 2 O microcubes and microspheres were synthesized using facile hydrothermal methods by manipulating the synthesis parameters. The Cu 2 O microcubes ($2 mm in diameter) were formed in presence of formic acid, whereas hierarchical Cu 2 O microspheres ($5 mm in diameter) were formed in acetic acid. Transmission electron microscopy (TEM) confirmed the formation of single crystalline microcubes and polycrystalline microspheres. The possible growth mechanism suggested that microcubes were formed due to the cubic crystal structure of Cu 2 O and the formation kinetics, whereas microspheres were formed due to the orientational attachment of nuclei with similar aggregation velocities along every direction. The electrochemical properties of the Cu 2 O microcubes and microspheres were investigated to understand the role of the morphology on the supercapacitor properties. The Cu 2 O microcubes exhibited a higher specific capacitance, better rate capability and cycling stability as compared to microspheres, although the particle size and pore size were larger and surface area was lower. The specific capacitance of the Cu 2 O microcubes and microspheres were 660 and 516 F g À1, respectively, at a 1 A g À1 current density. The Cu 2 O microcubes showed 80% specific capacitance retention at a 5 A g À1 current density after 1000 cycles. The single crystalline nature and the presence of a smaller number of grain boundaries in the microcubes compared to the microspheres resulted in an increase in conductivity and an increase in capacitance. The results showed that the Cu 2 O microcubes can be a promising electrode material for high performance supercapacitors.

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“…Furthermore, this strategy is known to improve mechanical properties of films containing layered materials and may assist with electrolyte accessibility by preventing restacking of adjacent sheets. 27,71 …”

Section:  mentioning

confidence: 99%

“…25 Moreover, a growing selection of layered oxides and hydroxides are showing great promise in this area. 3,[26][27][28][29][30][31][32][33][34][35] To best employ the high intrinsic pseudocapacitance of any material requires the maximum number of redox active sites be in contact with the electrolyte and therefore available for charge storage. This makes the layered oxides described above extremely attractive so long as they can be exfoliated into thin flakes.…”

mentioning

confidence: 99%

Effect of Percolation on the Capacitance of Supercapacitor Electrodes Prepared from Composites of Manganese Dioxide Nanoplatelets and Carbon Nanotubes

et al. 2014

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Here we demonstrate significant improvements in the performance of supercapacitor electrodes based on 2D MnO2 nano-platelets by the addition of carbon nanotubes. Electrodes based on MnO2 nano-platelets do not display high areal capacitance because the electrical properties of such films are poor, limiting the transport of charge between redox sites and the external circuit.In addition, the mechanical strength is low, limiting the achievable electrode thickness, even in the presence of binders. By adding carbon nanotubes to the MnO2-based electrodes, we have increased the conductivity by up to eight orders of magnitude, in line with percolation theory.The nanotube network facilitates charge transport, resulting in large increases in capacitance, especially at high rates, around 1 V/s. The increase in MnO2 specific capacitance scaled with nanotube content in a manner fully consistent with percolation theory. Importantly, the mechanical robustness was significantly enhanced, allowing the fabrication of electrodes that were 10 times thicker than could be achieved in MnO2-only films. This resulted in composite films with areal capacitances up to 40 times higher than could be achieved with MnO2-only electrodes.

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Preparation and supercapacitance of CuO nanosheet arrays grown on nickel foam

Cited by 362 publications

References 27 publications

Direct synthesis of RGO/Cu2O composite films on Cu foil for supercapacitors

Direct synthesis of RGO/Cu2O composite films on Cu foil for supercapacitors

Facile synthesis of Cu₂O microstructures and their morphology dependent electrochemical supercapacitor properties

Effect of Percolation on the Capacitance of Supercapacitor Electrodes Prepared from Composites of Manganese Dioxide Nanoplatelets and Carbon Nanotubes

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Preparation and supercapacitance of CuO nanosheet arrays grown on nickel foam

Cited by 362 publications

References 27 publications

Direct synthesis of RGO/Cu2O composite films on Cu foil for supercapacitors

Direct synthesis of RGO/Cu2O composite films on Cu foil for supercapacitors

Facile synthesis of Cu2O microstructures and their morphology dependent electrochemical supercapacitor properties

Effect of Percolation on the Capacitance of Supercapacitor Electrodes Prepared from Composites of Manganese Dioxide Nanoplatelets and Carbon Nanotubes

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Facile synthesis of Cu₂O microstructures and their morphology dependent electrochemical supercapacitor properties