Nickel foam-supported porous Ni(OH)2/NiOOH composite film as advanced pseudocapacitor material

Yuan, Y.F.; Xia, Xinhui; Wu, Jianbo; Yang, Jingling; Chen, Y.B.; Guo, S.Y.

doi:10.1016/j.electacta.2010.12.001

Cited by 208 publications

(107 citation statements)

References 24 publications

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“…S-3 in the ESM), less than 1.2% of the total capacitance, suggesting that the presence of the Ni foam is not the main reason for the high performance. This is confirmed by a previous report, in which nickel hydroxide was deposited on Ni foam, but the material did not show such a good performance [31]. Simple assembly of nanorods is not likely to be the critical factor either-previous reports of an urchin-like nanorod assembly or a column-structured nanosheet assembly only showed a capacitance of less than 700 F/g [16,17].…”

Section: Resultssupporting

confidence: 91%

Stable ultrahigh specific capacitance of NiO nanorod arrays

et al. 2011

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Previously reported examples of electrochemical pseudocapacitors based on cheap metal oxides have suffered from the need to compromise between specific capacitance, rate capacitance, and reversibility. Here we show that NiO nanorod arrays on Ni foam have a combination of ultrahigh specific capacitance (2018 F/g at 2.27 A/g), high power density (1536 F/g at 22.7 A/g), and good cycling stability (only 8% of capacitance was lost in the first 100 cycles with no further change in the subsequent 400 cycles). This resulted in an improvement in the reversible capacitance record for NiO by 50% or more, reaching 80% of the theoretical value, and demonstrated that a three-dimensional regular porous array structure can afford all of these virtues in a supercapacitor. The excellent performance can be attributed to the slim (< 20 nm) rod morphology, high crystallinity, regularly aligned array structure and strong bonding of the nanorods to the metallic Ni substrate, as revealed by scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray diffraction (XRD).

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Section: Resultssupporting

confidence: 91%

Stable ultrahigh specific capacitance of NiO nanorod arrays

et al. 2011

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“…[36]. On the other hand, the cathodic wave at 0.3 V is similar to that obtained during the activation of massive nickel electrodes [37,38]. The activation of the NiCB composite followed a similar trend (see supplementary Fig.…”

Section: Synthesis and Characterization Of The Electrocatalysts And Asupporting

confidence: 60%

Electrocatalytic activity of Ni-doped nanoporous carbons in the electrooxidation of propargyl alcohol

García‐Cruz

Sáez

Ania

et al. 2014

Carbon

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Please cite this article as: García-Cruz, L., Sáez, A., Ania, C.O., Solla-Gullón, J., Thiemann, T., Iniesta, J., Montiel, V., Electrocatalytic activity of Ni-doped nanoporous carbons in the electrooxidation of propargyl alcohol, Carbon (2014), doi: http://dx.doi.org/10.1016/j.carbon. 2014.02.066 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. Ni-doped nanoporous carbons provided similar propargyl alcohol conversions for very low metallic contents. Nanoparticulated Ni on various carbon supports gave rise to the highest electrocatalytic activity in terms of product selectivity, with a clear dependence on Ni content. The results point to the importance of controlling the dispersion of the Ni phase within the carbon matrix for a full exploitation of the electroactive area of the metal. Additionally, a change in the mechanism of the propargyl alcohol electrooxidation was noted, which seems to be related to the physicochemical properties of the carbon support as well. Thus, the stereoselectivity of the electrooxidative reaction can be controlled by the active nickel content immobilized on the anode, with a preferential oxidation to (Z)-3-(2-propynoxy)-2-propenoic acid with high Ni-loading, and to propiolic acid with low loading of active Ni sites. Moreover, the formation of (E)-3-(2-propynoxy)-2-propenoic acid was discriminatory irrespective of the experimental conditions and Ni loadings on the carbon matrixes.

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“…12 Porous, three-dimensional felts and foams also find particular importance in synthesis and energy storage. 10,13 Furthermore, nickel-based alloys are common electrocatalyst materials (e.g., Ni x Al y , 14 Ni x Zn y , 14,15 and Ni x Mo y ). 5,16,17 The evaluation of an electro-catalyst's activity requires that the electrochemically active surface area (A ECSA ) is known.…”

mentioning

confidence: 99%

An Oxalate Method for Measuring the Surface Area of Nickel Electrodes

Hall

Bock

MacDougall

2014

J. Electrochem. Soc.

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This work establishes a new method to measure the electrochemically active surface area (A ECSA ) of nickel electrodes, in situ. The addition of 0.08 mol L −1 of an oxalate salt to an alkaline electrolyte solution shifts the half-wave potential of the Ni(II)/Ni(III) redox pair by about −80 mV. Further, these peaks are very narrow. The sharpest peak in this work has a full width at half maximum (FWHM) of just 11 mV. This unusual sharpness is attributed to the layered structure of nickel hydroxides and the adsorption of oxalate from the solution on the (001) surface. This is supported by attenuated total reflectance infrared (ATR-IR) peaks measured at 1265 cm −1 , 1655 cm −1 , and 1713 cm −1 , which correspond to mononuclear bidentate oxalate bonded to nickel. At sufficiently fast potential scan rates (≥150 mV s −1 ), the adsorbed oxalate limits growth of the surface hydroxide to a single layer. During the reverse scan, the surface NiOOH/Ni(OH) 2 reduction peak is well-separated from other electrochemical processes and may be used to accurately and precisely measure the A ECSA . The error of this method is estimated at < 10%.

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Nickel foam-supported porous Ni(OH)2/NiOOH composite film as advanced pseudocapacitor material

Cited by 208 publications

References 24 publications

Stable ultrahigh specific capacitance of NiO nanorod arrays

Stable ultrahigh specific capacitance of NiO nanorod arrays

Electrocatalytic activity of Ni-doped nanoporous carbons in the electrooxidation of propargyl alcohol

An Oxalate Method for Measuring the Surface Area of Nickel Electrodes

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