Hierarchically mesoporous carbon nanopetal based electrodes for flexible supercapacitors with super-long cyclic stability

Cherusseri, Jayesh; Kar, Kamal K.

doi:10.1039/c5ta05603a

Cited by 136 publications

(46 citation statements)

References 66 publications

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“…This may be due to the continuous shuttling of the electrolyte ions during the cycling, which causes opening of the pores within the VGCF hybrid electrode thereby a decrease in resistance is observed. [30] The CV curves of VGCF hybrid electrode is found to have different profiles during the cycling study ( Figure S7, Supporting Information). A change in the CV profile is very common in the case of supercapacitor electrode cycling as can be seen in various literatures.…”

Section: Resultsmentioning

confidence: 99%

“…The VGCF ASSC exhibited a comparatively lower ESR after cycling ( Figure S9, Supporting Information).This may be due to the surface activation or pore opening within the VGCF hybrid electrode. [30] The flexibility of the VGCF ASSC was examined by bending the same at different bending angles such as 0, 30, 45, 60, 90, 135, and 180°. It exhibited 100% capacitance retention even at a severe bending angle of 180° (Figure 4g).…”

Section: Resultsmentioning

confidence: 99%

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Vertically Aligned Graphene–Carbon Fiber Hybrid Electrodes with Superlong Cycling Stability for Flexible Supercapacitors

Cherusseri

Kumar

Pandey

et al. 2019

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Graphene electrode–based supercapacitors are in high demand due to their superior electrochemical characteristics. A major bottleneck of using the supercapacitors for commercial applications lies in their inferior electrode cycle life. Herein, a simple and facile method to fabricate highly efficient supercapacitor electrodes using pristine graphene sheets vertically stacked and electrically connected to the carbon fibers which can result in vertically aligned graphene–carbon fiber nanostructure is developed. The vertically aligned graphene–carbon fiber electrode prepared by electrophoretic deposition possesses a mesoporous 3D architecture which enabled faster and efficient electrolyte‐ion diffusion with a gravimetric capacitance of 333.3 F g−1 and an areal capacitance of 166 mF cm−2. The electrodes displayed superlong electrochemical cycling stability of more than 100 000 cycles with 100% capacitance retention hence promising for long‐lasting supercapacitors. Apart from the electrochemical double layer charge storage, the oxygen‐containing surface moieties and α‐Ni(OH)2 present on the graphene sheets enhance the charge storage by faradaic reactions. This enables the assembled device to provide an excellent gravimetric energy density of 76 W h kg−1 with a 100% capacitance retention even after 1000 bending cycles. This study opens the door for developing high‐performing flexible graphene electrodes for wearable energy storage applications.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Vertically Aligned Graphene–Carbon Fiber Hybrid Electrodes with Superlong Cycling Stability for Flexible Supercapacitors

Cherusseri

Kumar

Pandey

et al. 2019

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“…[1][2][3][4][5][6] Among various energy storage devices, supercapacitors, also known as electrochemical capacitors or ultracapacitors, have been drawing considerable dominate mechanisms with different electrolytes are applied. [1][2][3][4][5][6] Among various energy storage devices, supercapacitors, also known as electrochemical capacitors or ultracapacitors, have been drawing considerable dominate mechanisms with different electrolytes are applied.…”

Section: Introductionmentioning

confidence: 99%

“…The wide spread of wearable and portable electronics including flexible displays, health sensors, and mobile electronic products, calls for the urgent development of flexible, highefficient, thin energy storage devices. [1][2][3][4][5][6] Among various energy storage devices, supercapacitors, also known as electrochemical capacitors or ultracapacitors, have been drawing considerable dominate mechanisms with different electrolytes are applied. Finally, the application of BNWs-CFC as flexible all-solid-state supercapacitor (ASSC) was demonstrated, and the flexible supercapacitors delivered a significant areal capacitance of up to 17.5 mF cm −2 at 10 mV s −1 .…”

Section: Introductionmentioning

confidence: 99%

Boron Element Nanowires Electrode for Supercapacitors

Xue

Gan

Huang

et al. 2018

Advanced Energy Materials

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attention as ideal energy storage devices owing to their excellent power density, high safety, quick charging/discharging, and good cycling stability. [7][8][9][10][11][12][13] A research frontier is to develop flexible supercapacitors with good electrochemical and mechanical performance, where the integration of flexibility in supercapacitors is of great importance for powering various flexible electronics and enabling applications in multifunctional flexible electronics. [11,[14][15][16][17] Notably, the electrode material is the most crucial component for a supercapacitor, which directly determines the performance of supercapacitors. Electrical double-layer capacitors (EDLCs) suffer from the low specific capacitance which constitutes a huge obstacle for increasing the energy density, whereas pseudocapacitors possess the higher specific capacitance but are confined by relatively poor cycling stability and long discharging time. [1,14,18] So far, intensive efforts are aimed at improving the performance of supercapacitor based on traditional active materials including carbon-based material, transitional metal-based material, and conducting polymers. [1][2][3][4]7,8,19] Although some novel materials, including sulfides, selenides, etc., have been proposed to be supercapacitive materials, the pursuit of new categories of active materials as electrodes of supercapacitors remains a great challenge. [20][21][22] Recently, Jiang and co-workers theoretically predicted the superior capacitive performance of 2D boron sheets, which exhibit specific capacitance on the order of 400 F g −1 owing to their metallicity and low weight, suggesting boron element might be a potential electrode material of supercapacitors. [23] Unfortunately, so far, the desired experimental work on any materials based on boron element for supercapacitor has not been reported.Herein, we report a new category of supercapacitor materials: boron element nanowires (BNWs). Single-crystal BNWs were synthesized through a cost-effective chemical vapor deposition (CVD) method. Surprisingly, the as-prepared BNWs demonstrate high stability and promising capacitance in all alkaline, neutral, and acid aqueous electrolytes. Especially, in an H 2 SO 4 electrolyte, the BNWs on a carbon fiber cloth (CFC) substrate achieved a capacitance up to 60.2 mF cm −2 . Moreover, to understand the mechanism of capacitance in BNWs-CFCs, we studied the electrochemically charge/discharge processes of BNWs-CFC electrodes in three different electrolytes, which reveals different The pursuit of new categories of active materials as electrodes of supercapacitors remains a great challenge. Herein, for the first time, elemental boron as a superior electrode material of supercapacitors is reported, which exhibits significantly high capacitances and excellent rate performance in all alkaline, neutral, and acidic electrolytes. Notably, boron nanowire-carbon fiber cloth (BNWs-CFC) electrodes achieve a capacitance up to 42.8 mF cm −2 at a scan rate of 5 mV s −1 and 60.2 mF cm −2 at a current d...

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“…Typical supercapacitor electrode materials can be categorized into one-dimensional (1D), two-dimensional (2D), and three-dimensional (3D), depending on the structure for charge transfer. Some examples of these materials are carbon nanotubes [10][11][12][13], graphene [14][15][16][17], carbon nanofiber [18][19][20], and porous carbon [21,22]. Tubular nanostructure offers high surface area with less utilization of mass to encapsulate materials with poor conductivity [23,24] but has low surface area [25] and high contact resistance at the electrode-current collector [26,27].…”

Section: Introductionmentioning

confidence: 99%

Biomass-Derived, Interconnected and Reticular Carbon Microtubes Electrodes for Symmetric Capacitors

Wang

Wei

et al. 2017

Preprint

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Biomass materials have received attention for energy storagebecaused of the advantage of low-cost, easy-to-prepare, and eco-friendliness. Three-dimensional carbon materialswith abundant pore structure gradually becomeresearch hotspot in high-performance energy storage. In this study, an easy-to-prepare, green, light and elastic activated carbon was present using the biomass Juncus effusus (JCE) via high-temperature pyrolysis, followed by activation in air. Compared with previously reported bio-carbons, the proposed air-activated bio-carbon contributes in the fabrication of pores to preserve the interconnected, reticular and tubular structure. Moreover, the interconnected porous material also inherits the excellent tenacity of the original JCE such as the material can be bended to below 90 o under an external force while maintaining structural integrity. The activated porous carbon material exhibits an enhanced electric double-layer capacitance (~210 F g -1 at 1 A g -1 ), with capacitance retention of ~78.62% at 10 A g -1 . The interconnected porous carbon microtubes electrode as a double-layer symmetric capacitor exhibits considerable capacitance retention (84%) after 2000 cycles at 1 A g -1 . The improved energy storage performance was proposed to be attributed to the shortened ionic diffusion distance and sufficient contact between the interface of the carbon electrode and electrolyte, which is resulted from the elastic, undamaged structure and types of pores. These results demonstrated that as-preparedcarbon materials have potentional application in symmetric capacitors.

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Hierarchically mesoporous carbon nanopetal based electrodes for flexible supercapacitors with super-long cyclic stability

Abstract: Flexible supercapacitors manufactured with hierarchically mesoporous carbon nanopetal based electrodes exhibit high capacitance and power density with super-long cyclic stability.

Cited by 136 publications

References 66 publications

Vertically Aligned Graphene–Carbon Fiber Hybrid Electrodes with Superlong Cycling Stability for Flexible Supercapacitors

Vertically Aligned Graphene–Carbon Fiber Hybrid Electrodes with Superlong Cycling Stability for Flexible Supercapacitors

Boron Element Nanowires Electrode for Supercapacitors

Biomass-Derived, Interconnected and Reticular Carbon Microtubes Electrodes for Symmetric Capacitors

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