Flexible Solid-State Supercapacitors Based on Carbon Nanoparticles/MnO<sub>2</sub> Nanorods Hybrid Structure

Yuan, Longyan; Lu, Xihong; Xu, Xiao; Zhai, Teng; Dai, Junjie; Zhang, Fengchao; Hu, Bin; Wang, Xue; Gong, L.; Chen, Jian; Hu, Chenguo; Tong, Yexiang; Zhou, Jun; Wang, Zhong Lin

doi:10.1021/nn2041279

Cited by 970 publications

(601 citation statements)

References 39 publications

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“…According to the equation t 0 ¼ 1/f 0 , the relaxation time constant t 0 of this ASC device is calculated to be Scalable self-growth of 3D porous Ni@NiO core-shell electrodes M Yu et al B0.09 s, which is substantially shorter than that of recently reported SCs. 9,25 Such a rapid frequency response further confirms the fast ion transport rate property of the ANF//RGO-ASC device. Additionally, the ANF//RGO-ASC device exhibits outstanding cycling stability without any decay volumetric capacitance after 10 000 cycles (Supplementary Figure S8).…”

Section: Figure 1 (A) Schematic Diagram Illustrating the Activation Psupporting

confidence: 57%

“…Significantly, although our asfabricated ANF//RGO-ASC device only has a small voltage window of 1.5 V, the maximum volumetric energy density reached 1.06 mWh cm À3 . This value is substantially higher than that of recently reported symmetric SCs (SSCs) and most of ASCs with larger operation potential windows, such as graphene-SSC (0.07 mWh cm À3 ), 1 MnO 2 /CNP-SSC (0.12 mWh cm À3 ), 25 TiN-SSC (0.05 mWh cm À3 ), 29 ZnO@MnO 2 //RGO-ASC (0.24 mWh cm À3 , 1.8 V) 24 and TiO 2 @MnO 2 //TiO 2 @C-ASC (0.30 mWh cm À3 , 1.8 V), 28 are comparable with that of VO x //VN-ASC (0.61 mWh cm À3 , 1.8 V) 9 and MnO 2 /RGO//RGO-ASC (0.72 mWh cm À3 , 1.8 V). 16 Moreover, the ANF//RGO-ASC device also exhibited a superior power density of 0.42 W cm À3 , which is considerably higher than that of SSCs and ASCs.…”

Section: Figure 1 (A) Schematic Diagram Illustrating the Activation Pmentioning

confidence: 59%

“…16 Moreover, the ANF//RGO-ASC device also exhibited a superior power density of 0.42 W cm À3 , which is considerably higher than that of SSCs and ASCs. 1, [23][24][25][26][27][28][29] After charging at a current density of 20 mA cm À2 for 10 s, a tandem device with three ANF//RGO-ASC devices in series could power a light-emitting diode array display (4-5 V) for B1 min (inset in Figure 5). Moreover, because of the unique porous structure and strong mechanical properties, the volumetric performance of the ANF//RGO-ASC device can be further improved by compression of the device.…”

Section: Figure 1 (A) Schematic Diagram Illustrating the Activation Pmentioning

confidence: 99%

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Scalable self-growth of Ni@NiO core-shell electrode with ultrahigh capacitance and super-long cyclic stability for supercapacitors

et al. 2014

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Three-dimensional (3D) electrodes have been demonstrated to be promising candidates for high-performance supercapacitors because of their unique architectures and outstanding electrochemical properties. However, the fabrication process for current 3D electrodes is not scalable. Herein, a novel and cost-effective activation process has been developed to macroscopically produce 3D porous Ni@NiO core-shell electrodes with enhanced electrochemical properties. The porous Ni@NiO core-shell electrode obtained by activated commercial Ni foam (NF) in a 3 M HCl solution yields an ultrahigh areal capacitance of 2.0 F cm À2 at a high current density of 8 mA cm À2 , which is substantially higher than that of most reported 3D NF-based electrodes. Moreover, the activated NF (ANF) electrode exhibited super-long cycling stability. Owing to the increased accessible surface area and continual formation of electrochemically active NiO during cycling, the areal capacitance of the ANF electrode did not exhibit any decay and instead increased from 0.47 to 1.27 F cm À2 after 100 000 cycles at 100 mV s À1 . This is the best cycling stability achieved by a 3D NF-based electrode. Additionally, a high-performance asymmetrical supercapacitor (ASC) device based on the as-prepared ANF cathode and a reduced graphene oxide (RGO) anode was also prepared. The ANF//RGO-ASC device was able to deliver a maximum energy density of 1.06 mWh cm À3 and a maximum power density of 0.42 W cm À3 .

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Section: Figure 1 (A) Schematic Diagram Illustrating the Activation Psupporting

confidence: 57%

Section: Figure 1 (A) Schematic Diagram Illustrating the Activation Pmentioning

confidence: 59%

Section: Figure 1 (A) Schematic Diagram Illustrating the Activation Pmentioning

confidence: 99%

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Scalable self-growth of Ni@NiO core-shell electrode with ultrahigh capacitance and super-long cyclic stability for supercapacitors

et al. 2014

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“…[1,102] Currently, many efforts have been made to improve the energy density of the SWCNT-based electrodes including the addition of CPs into the SWCNT-based electrodes. [103][104][105][106][107][108][109][110][111][112][113][114] The SWCNT/CP electrodes display high energy density due to pseudo-capacitance originating from CP. Therefore, one of the most critical aspects in the development of SWCNT/CP SCs is to optimize the energy density without deteriorating their high power capability as both these parameters determine the ultimate performance of the SC.…”

Section: Cnts/conductive Polymer Flexible Pseudo-capacitorsmentioning

confidence: 99%

Flexible Supercapacitors – Development of Bendable Carbon Architectures

Niu

Liu

Sherrell

et al. 2013

ACS Symposium Series

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As energy storage devices, Supercapacitors (SCs), also known as electrochemical capacitors, possess high power densities, excellent reversibility and long cycle life. SCs could be applied to diverse fields including electric vehicles, pulse power applications and portable devices. Flexible SCs have attracted significant attention for powering recently developed portable, flexible and wearable electronics. During the past several years, a variety of bendable carbon-based electrode architechtures and flexible SC devices with different designs have been successfully prepared. In this review, we will describe recent developments in the preparation of such bendable carbon-based electrode architechtures and the subsequent design of flexible SC devices. Future development and prospects of flexible SCs are also discussed.

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“…[1][2][3][4][5] On the basis of charge storage mechanism, SCs can be classified into electric double layer capacitors where charges are physically separated and pseudocapacitors where charges are stored chemically through Faradaic reactions. [6][7][8][9][10][11][12] Pseudocapacitors with high specific capacitance can provide more energy per unit area/volume and thus hold great promise for future applications. Metal oxides have been extensively studied as electrode materials for pseudocapacitors.…”

mentioning

confidence: 99%

Flexible solid-state symmetric supercapacitors based on MnO2 nanofilms with high rate capability and long cyclability

Guo

et al. 2013

AIP Advances

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Flexible solid-state symmetric supercapacitor was fabricated using MnO2 nanofilms growing directly on carbon cloth as the electrodes and PVA/H3PO4 gel as the electrolyte/separator. The device can be operated at a stable cell-voltage up to 1.4 V, obviously larger than that of conventional solid-state symmetric supercapacitors (≤1 V). It exhibited excellent rate capability with a scan rate as high as 20 V s−1 and a long cyclability (∼60000 cycles) even under severe mechanical deformation. The charge storage mechanism at different scan rates was also quantitatively analyzed

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Flexible Solid-State Supercapacitors Based on Carbon Nanoparticles/MnO₂ Nanorods Hybrid Structure

Cited by 970 publications

References 39 publications

Scalable self-growth of Ni@NiO core-shell electrode with ultrahigh capacitance and super-long cyclic stability for supercapacitors

Scalable self-growth of Ni@NiO core-shell electrode with ultrahigh capacitance and super-long cyclic stability for supercapacitors

Flexible Supercapacitors – Development of Bendable Carbon Architectures

Flexible solid-state symmetric supercapacitors based on MnO2 nanofilms with high rate capability and long cyclability

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Flexible Solid-State Supercapacitors Based on Carbon Nanoparticles/MnO2 Nanorods Hybrid Structure

Cited by 970 publications

References 39 publications

Scalable self-growth of Ni@NiO core-shell electrode with ultrahigh capacitance and super-long cyclic stability for supercapacitors

Scalable self-growth of Ni@NiO core-shell electrode with ultrahigh capacitance and super-long cyclic stability for supercapacitors

Flexible Supercapacitors – Development of Bendable Carbon Architectures

Flexible solid-state symmetric supercapacitors based on MnO2 nanofilms with high rate capability and long cyclability

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Flexible Solid-State Supercapacitors Based on Carbon Nanoparticles/MnO₂ Nanorods Hybrid Structure