Facile approach to synthesize Ni(OH)2 nanoflakes on MWCNTs for high performance electrochemical supercapacitors

Shahid, Muhammad; Liu, Jingling; Shakir, Imran; Warsi, Muhammad Farooq; Nadeem, Muhammad; Kwon, Young‐Uk

doi:10.1016/j.electacta.2012.08.058

Cited by 45 publications

(23 citation statements)

References 39 publications

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“…Moreover, the uniform decoration of Ni(OH) 2 on CNT bundles, which in turn, prevents possible restacking of CNT bundles and improve the electrical double-layer capacitance of CNTs. In addition, as an excellent host material for the coating of ultrathin nanoflakes of Ni(OH) 2 , CNT films can provide a good electrical conducting path for charge transfer and redox kinetics of the deposited layer, 8,9 which can be further verified by EIS analysis (Fig. S3).…”

Section: Resultsmentioning

confidence: 98%

“…Thus, carbon nanotubes (CNTs) was introduced to increase the conductivity of Ni(OH) 2 and to achieve a higher utilization of the Ni(OH) 2 nanostructures. 7-10 However, these composite materials were mostly powder-based or non-flexible 7,8 and the addition of polymer binder used in conventional ink-spread processing of electrodes inhibits the ion transport in the electrolyte and degrades the electrical conductivity, leading to an obvious capacity loss and low fabrication-efficiency. 11 CNT films can be a promising type of current collector for lightweight and flexible electrodes due to their good electrical conductivity, chemical stability and mechanical durability.…”

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confidence: 99%

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Facile Synthesis of Ni(OH)2 Nanoflakes on Carbon Nanotube Films as Flexible Binder-Free Electrode for Supercapacitors

Zhou

Hou

Wan

et al. 2013

ECS Solid State Letters

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Freestanding Ni(OH) 2 nanoflakes on CNT films (NNCF) electrode with high specific capacitance is effectively fabricated via a facile chemical precipitation method. The CNT films function as conductive networks and the nucleation centers of Ni(OH) 2 nanoflakes. The resulted ultrathin α-Ni(OH) 2 exhibits a high specific capacitance of 3351 F g −1 at a scan rate of 2 mV s −1 and a good cycling stability with a visibly low capacitance loss of 15% at a high scan rate of 70 mV s −1 , suggesting promising potential for supercapacitor applications.Electrochemical capacitors (ECs) have recently attracted extensive attention for applications in high power energy storage devices. Various materials have been investigated as candidates for electrodes in supercapacitors, including carboneous materials, conducting polymers, and transition metal oxides. 1-3 Nickel hydroxide Ni(OH) 2 , is one of the active transition metal hydroxide from the series of different pseudocapacitive materials used for supercapacitor due to their low cost, large theoretical specific capacitance and well defined redox behavior. 4-6 However, poor electrical conductivity and low cycle life restrict pseudocapacitive Ni(OH) 2 from practical applications. Thus, carbon nanotubes (CNTs) was introduced to increase the conductivity of Ni(OH) 2 and to achieve a higher utilization of the Ni(OH) 2 nanostructures. 7-10 However, these composite materials were mostly powder-based or non-flexible 7,8 and the addition of polymer binder used in conventional ink-spread processing of electrodes inhibits the ion transport in the electrolyte and degrades the electrical conductivity, leading to an obvious capacity loss and low fabrication-efficiency. 11 CNT films can be a promising type of current collector for lightweight and flexible electrodes due to their good electrical conductivity, chemical stability and mechanical durability. 12-15 Here, we report a facile synthesis of Ni(OH) 2 nanoflakes which anchor on the flexible CNT films substrate to fabricate freestanding electrodes for supercapacitors. The as-prepared hybrid electrode displays ultrahigh specific capacitance, superior cycling performance and excellent rate capability. ExperimentalThe initial CNT films were fabricated by using chemical vapor deposition (CVD) techniques in which layered CNT sock was to form a seamless sheet via a spinning process. 16 Then it was cut into 1cm ×1cm multi-layered CNT films pieces (as shown in the inset of Fig. 1a). The SEM image in Fig. 1a shows the structure of pristine CNT films, in which CNTs bundles are entangled and interconnected to form a uniform network. A certain amount of amorphous carbons can be observed in pristine CNT networks. Pristine CNT films were functionalized by attaching carboxylic and hydroxyl groups on its surface through acid treating and then washed up to neutral pH and dried.The Ni(OH) 2 nanoflakes on CNT films (NNCF) electrode was synthesized by chemical precipitation technique. The mixture solution for chemical precipitation were prepared by rapid mixing ...

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Section: Resultsmentioning

confidence: 98%

mentioning

confidence: 99%

Facile Synthesis of Ni(OH)2 Nanoflakes on Carbon Nanotube Films as Flexible Binder-Free Electrode for Supercapacitors

Zhou

Hou

Wan

et al. 2013

ECS Solid State Letters

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“…With the RGO support, electron conduction paths can be created and thus the conductivities of NiCo 2 S 4 /RGO hybrids are greatly improved, which facilitates the charge transfer and charge transport during the redox reaction process. 41 The NiCo 2 S 4 /RGO-3 hybrid electrode achieves the capacitance values of 1526, 1484, 1452, 1310 and 1109 F g -1 at current density of 1.0, 2.0, 5.0, 10 and 20 A g -1 , respectively. 28 Therefore, RGO in NiCo 2 S 4 /RGO hybrids serves as both conductive channel and an ideal support matrix.…”

Section: Electrochemical Properties Of Nico 2 S 4 /Rgo Hybridsmentioning

confidence: 93%

Facile synthesis of nickel–cobalt sulfide/reduced graphene oxide hybrid with enhanced capacitive performance

Cai

Shen

et al. 2015

RSC Adv.

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A uniform hybrid with nickel-cobalt sulfide (NiCo2S4) nanoparticles attached on reduced graphene oxide (RGO) nanosheets is fabricated through a facile one-pot refluxing method. NiCo2S4 nanoparticles with sizes of several nanometers uniformly disperse on the surface of RGO sheets, and the electrochemical property of the resulted NiCo2S4/RGO hybrids is investigated as electrode materials for supercapacitor. The NiCo2S4/RGO hybrids deliver a maximum specific capacitance of 1526 F g -1 at the current density of 1.0 A g -1 , and a great rate capability, remaining 1109 F g -1 at a high current density of 20 A g -1 . Moreover, after 2000 charge-discharge cycles at the current density of 10 A g -1 , 83% of the initial capacitance is maintained, indicating a good cycling stability The enhanced capacitive performance can be attributed to the synergistic effect between NiCo2S4 nanoparticles and RGO, in which RGO can serve as conductive channels and an ideal support matrix. The facile synthesis and the remarkable capacitive performance of the NiCo2S4/RGO hybrid make it a promising candidate for electrode material in electrochemical energy conversion/storage devices.

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“…In this current paper, 80 scientific papers describing new Ni(OH) 2 or NiO-based electrodes for supercapacitor [12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,…”

Section: Methodsmentioning

confidence: 99%

Ni(OH)2 and NiO Based Composites: Battery Type Electrode Materials for Hybrid Supercapacitor Devices

et al. 2018

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Nanocomposites of Ni(OH)2 or NiO have successfully been used in electrodes in the last five years, but they have been falsely presented as pseudocapacitive electrodes for electrochemical capacitors and hybrid devices. Indeed, these nickel oxide or hydroxide electrodes are pure battery-type electrodes which store charges through faradaic processes as can be shown by cyclic voltammograms or constant current galvanostatic charge/discharge plots. Despite this misunderstanding, such electrodes can be of interest as positive electrodes in hybrid supercapacitors operating under KOH electrolyte, together with an activated carbon-negative electrode. This study indicates the requirements for the implementation of Ni(OH)2-based electrodes in hybrid designs and the improvements that are necessary in order to increase the energy and power densities of such devices. Mass loading is the key parameter which must be above 10 mg·cm−2 to correctly evaluate the performance of Ni(OH)2 or NiO-based nanocomposite electrodes and provide gravimetric capacity values. With such loadings, rate capability, capacity, cycling ability, energy and power densities can be accurately evaluated. Among the 80 papers analyzed in this study, there are indications that such nanocomposite electrode can successfully improve the performance of standard Ni(OH)2 (+)//6 M KOH//activated carbon (−) hybrid supercapacitor.

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Facile approach to synthesize Ni(OH)2 nanoflakes on MWCNTs for high performance electrochemical supercapacitors

Cited by 45 publications

References 39 publications

Facile Synthesis of Ni(OH)2 Nanoflakes on Carbon Nanotube Films as Flexible Binder-Free Electrode for Supercapacitors

Facile Synthesis of Ni(OH)2 Nanoflakes on Carbon Nanotube Films as Flexible Binder-Free Electrode for Supercapacitors

Facile synthesis of nickel–cobalt sulfide/reduced graphene oxide hybrid with enhanced capacitive performance

Ni(OH)2 and NiO Based Composites: Battery Type Electrode Materials for Hybrid Supercapacitor Devices

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