Electrophoretic deposition of network-like carbon nanofiber as a conducting substrate for nanostructured nickel oxide electrode

Wu, Mao‐Sung; Huang, Chen-Yu; Jow, Jiin-Jiang

doi:10.1016/j.elecom.2009.01.034

Cited by 22 publications

(9 citation statements)

References 16 publications

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“…After heat-treatment, the surface of the deposited Ni can be oxidized to form NiO. The redox peaks may have presumably come from the redox reactions between NiO and NiOOH in an alkaline solution as follows [18][19][20][21][22] NiO…”

Section: Resultsmentioning

confidence: 99%

Facile Electrophoretic Deposition of Ni-Decorated Carbon Nanotube Film for Electrochemical Capacitors

Huang

Lin

2009

Electrochem. Solid-State Lett.

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Ni-decorated carbon nanotube ͑CNT͒ film of a networklike architecture has been formed on a stainless steel substrate by electrophoretic deposition ͑EPD͒ in CNT suspension containing nickel nitrate. Adsorption of nickel ions on the CNTs increases the measured zeta potential and consequently favors the dispersion and EPD of CNTs. Nickel ions are reduced on the CNT surface to form Ni-decorated CNT film in the EPD process. The deposited nickel layer plays an important role in improving the adhesion, wettability, and electrochemical reaction of the film. Therefore, the Ni-decorated CNT film exhibits an excellent capacitive behavior compared with the bare CNT film.There is a growing interest in the application of electrophoretic deposition ͑EPD͒ for the preparation of carbon nanotube ͑CNT͒ film for field-emission devices, 1-6 fuel cells, 7 and electrochemical capacitors. 8,9 EPD allows an efficient deposition of CNT film of controlled thickness and homogeneous microstructure on conductive substrates because it has the advantages of short formation time, simple setup, low cost, and suitability for mass production. 2,10 EPD proceeds via three processes: particle charging, particle transport under the applied electric field, and deposition of particles with neutralization. 11,12 Cathodic or anodic deposition can be achieved depending on the particle charge. 13 The surface charge on the CNTs, which can be controlled by the addition of a charging agent to the suspension, plays an important role in stabilizing the suspension and in facilitating the deposition. A variety of salts and surfactants have been employed in CNT suspensions including Mg͑NO 3 ͒ 2 , 1,4,8,9 NaOH, 2 MgCl 2 , 3 Al͑NO 3 ͒ 3 , 6 sodium dodecyl sulfate, 5 and tetraoctylammonium bromide. 7,14 It was reported that the presence of a charging agent improves the adhesion of CNTs to substrates in the EPD process. 2 However, residual surfactants can be difficult to remove once added and may be detrimental to the performance of CNTs in a given application. 11 Electrochemical capacitors are energy-storage devices that have attracted much attention due to their high power capability and longcycle life compared to the traditional batteries. 15 Recently, EPD of CNTs on nickel foils from ethanol suspension containing Mg͑NO 3 ͒ 2 has been explored for application in supercapacitors. 8,9 In this work, the Ni-decorated CNT film is deposited onto stainless steel ͑SS͒ substrates by EPD in the CNT suspension containing nickel nitrate additive. The proposed EPD strategy allows nickel ions to deposit on the CNT surface, forming a hydrophilic surface and a metallic binder to bind CNTs together. More importantly, the deposited nickel can act as active sites for the faradaic reaction to store more capacitance in an alkaline solution. ExperimentalThe multiwall CNTs were purchased from Advance Nanopower Inc. ͑ANP CC8265, Taiwan͒ and were graphitized with an external diameter of 10-40 nm and a length of 10 m. EPD of the Nidecorated CNT film was carried out at room temperature by appl...

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Section: Resultsmentioning

confidence: 99%

Facile Electrophoretic Deposition of Ni-Decorated Carbon Nanotube Film for Electrochemical Capacitors

Huang

Lin

2009

Electrochem. Solid-State Lett.

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“…The VGCF and CNT were blended and a VGCF-CNT network was clearly observed [21]. Lestriez et al [23] and Wu et al [24] studied networks between carbon fibers and CNT to improve the electric conductivity of electrodes for lithium batteries and showed that the network formed by the carbon fibers and CNT was affected in improving the electric conductivity. This suggested that the VGCF-CNT network may be a reason for the increase in the thermal conductivity of the composites.…”

Section: Vgcf-cnt Networkmentioning

confidence: 99%

Correlations between Thermal Conductivity and Inelastic Deformation of Aluminum Based Composites Containing VGCF-CNT Network

Fukuchi

Sasaki

Imanishi³

et al. 2012

JMMP

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This paper evaluates the reliability of an aluminum based composite including vapor growth carbon fibers (VGCF) and carbon nanotubes (CNT). The composite is fabricated using spark plasma sintering and has high thermal conductivity. For the reliability evaluation, the correlation between the inelastic deformation and thermal conductivity of the composite is discussed both with experiments and simulation conducted by the finite element method (FEM). Specimens made from the composite are first subjected to tensile loading until inelastic strain occurs. After the tensile loading, the thermal conductivities of the specimens were measured to establish the differences between the thermal conductivity before and after the tensile loading. The FEM analyses are also conducted to evaluate the reliability of the composites. It was found that the thermal conductivity changed due to the inelastic deformation of the composites and that a FEM analysis considering the damage due to the deformation qualitatively estimates the differences in the thermal conductivity before and after the tensile loading.

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“…Electrochemical deposition has some advantages over other techniques, e.g., the mass and thickness of the metal oxide film is easily controllable simply by adjusting the current, temperature and electrolyte chemical composition. Meanwhile the combination of metal oxide with other materials, such as conducting carbon materials, may provide excellent electrochemical and mechanical properties for electrochemical energy storage [8][9]. In this report, Ni(OH) 2 /CNTs nanocomposites were prepared by a low cost electrochemical deposition method.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical deposition of Ni(OH)2/CNTs electrode as electrochemical capacitors

et al. 2011

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The electrochemical properties of Ni(OH) 2 /CNTs prepared by electrochemical deposition were investigated in this article. The results show that deposits of Ni(OH) 2 has high purity and can optimize the electronic and ionic conductivity to minimize the total resistance of the system and maximize the performance characteristics as supercapacitor electrodes. The specific capacitance at a scan rate of 2 mV/s reaches as high as 2486 F/g, which gives the composites potential application as high-performance supercapacitor electrode materials. Meanwhile, the products were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM).

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Electrophoretic deposition of network-like carbon nanofiber as a conducting substrate for nanostructured nickel oxide electrode

Cited by 22 publications

References 16 publications

Facile Electrophoretic Deposition of Ni-Decorated Carbon Nanotube Film for Electrochemical Capacitors

Facile Electrophoretic Deposition of Ni-Decorated Carbon Nanotube Film for Electrochemical Capacitors

Correlations between Thermal Conductivity and Inelastic Deformation of Aluminum Based Composites Containing VGCF-CNT Network

Electrochemical deposition of Ni(OH)2/CNTs electrode as electrochemical capacitors

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