Three-dimensional coral-like NiCoP@C@Ni(OH)2 core-shell nanoarrays as battery-type electrodes to enhance cycle stability and energy density for hybrid supercapacitors

Zong, Quan; Ye, Hui; Wang, Qianqian; Zhang, Qilong; Zhu, Yulu; Wang, Huiying; Shen, Qing

doi:10.1016/j.cej.2018.12.041

Cited by 188 publications

(60 citation statements)

References 54 publications

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“…At the same time, we further studied the charge storage kinetics of the NF@MnMoO 4 electrode materials by calculating the CV according to the scan rate ( v ) and current ( i ) relationship: , where a is a constant, and its value depends on the nature of the electrode material itself, and b is between 0.5 and 1.0, which is determined from the slope of the log( v ) and log( i ) plot. For a diffusion-controlled process, the b value is close to 0.5, while for a surface capacitive-controlled process, the b value approaches 1.0.…”

Section: Resultsmentioning

confidence: 99%

High-Energy-Density Asymmetric Supercapacitor Based on a Durable and Stable Manganese Molybdate Nanostructure Electrode for Energy Storage Systems

Sun

Han

et al. 2020

ACS Appl. Energy Mater.

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3D interconnected MnMoO 4 nanosheet arrays with abundant open spaces and ordered arrangements deposited on nickel foam (NF@MnMoO 4 ) are fabricated by a mild one-step hydrothermal method. As an integrated binder-free electrode for supercapacitors, the optimized NF@MnMoO 4 electrode exhibits a superhigh specific capacitance of 4609 F g −1 (640 mAh g −1 ) at a current density of 1 A g −1 , remarkable rate capability (2800 F g −1 (388.89 mAh g −1 ) even at a current density as high as 20 A g −1 ), and outstanding cycling stability (92.4% of the initial specific capacitance after 20,000 cycles). The fabricated NF@MnMoO 4 //AC asymmetric supercapacitors (ASCs) with excellent cycling performance and high Coulombic efficiency achieve an ultrahigh energy density of 107.38 Wh kg −1 at a power density of 801.34 W kg −1 (72.18 Wh kg −1 at a power density of 3987.85 W kg −1 ). As the practical application, the self-charging power packs of commercial solar cells and NF@MnMoO 4 //AC ASCs are demonstrated to power an LED without extra recharging by other devices, indicating their promising applications in self-power energy-harvesting storage systems.

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Section: Resultsmentioning

confidence: 99%

High-Energy-Density Asymmetric Supercapacitor Based on a Durable and Stable Manganese Molybdate Nanostructure Electrode for Energy Storage Systems

Sun

Han

et al. 2020

ACS Appl. Energy Mater.

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“…7b. The Ragone plot of heterojunction α-Co(OH) 2 /α-Ni(OH) 2 //AC device reflects a high energy density values of 72.6 Wh kg −1 at power density of 196.4 W kg −1 and energy density of 40.9 Wh kg −1 at power density of 3491.8 W kg −1 , which are obviously higher than Ni(OH) 2 //AC (40.9 Wh kg −1 at 405 W kg −1 ) 52 , Co 3 O 4 /CoS/Ni(OH) 2 //AC (25.4 Wh kg −1 at 81.8 W kg −1 ) 53 , Ni(OH) 2 /Mn 2 O 3 //AC (41.6 Wh kg −1 at 799.4 W kg −1 ) 54 , NiCoP@C/Ni(OH) 2 //AC (49.5 Wh kg −1 at 399.8 W kg −1 ) 55 , Ni1-Co2-S/Co(OH) 2 //AC (48.8 Wh kg −1 at 800 W kg −1 ) 56 and Ni-Co-S//G (43.3 Wh kg −1 at 800 W kg −1 ) 57 . All these results prove an enormous potential to apply the heterojunction material for low cost energy storage device.…”

Section: Resultsmentioning

confidence: 99%

Heterojunction α-Co(OH)2/α-Ni(OH)2 nanorods arrays on Ni foam with high utilization rate and excellent structure stability for high-performance supercapacitor

Zhou

Wei

Zhang

et al. 2019

Sci Rep

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The practical implementation of supercapacitors is hindered by low utilization and poor structural stability of electrode materials. Herein, to surmount these critical challenges, a three-dimensional hierarchical α-Co(OH) 2 /α-Ni(OH) 2 heterojunction nanorods are built in situ on Ni foam through a mild two-step growth reaction. The unique lamellar crystal structure and abundant intercalated anions of α-M(OH) 2 (M = Co or Ni) and the ideal electronic conductivity of α-Co(OH) 2 construct numerous cross-linked ion and electron transport paths in heterojunction nanorods. The deformation stresses exerted by α-Co(OH) 2 and α-Ni(OH) 2 on each other guarantee the excellent structural stability of this heterojunction nanorods. Using nickel foam with a three-dimensional network conductive framework as the template ensures the rapidly transfer of electrons between this heterojunction nanorods and current collector. Three-dimensional hierarchical structure of α-Co(OH) 2 /α-Ni(OH) 2 heterojunction nanorods provides a large liquid interface area. These result together in the high utilization rate and excellent structure stability of the α-Co(OH) 2 /α-Ni(OH) 2 heterojunction nanorods. And the capacitance retention rate is up to 93.4% at 1 A g −1 from three-electrode system to two-electrode system. The α-Co(OH) 2 /α-Ni(OH) 2 //AC device also present a long cycle life (the capacitance retention rate is 123.6% at 5 A g −1 for 10000 cycles), a high specific capacitance (207.2 F g −1 at 1 A g −1 ), and high energy density and power density (72.6 Wh kg −1 at 196.4 W kg −1 and 40.9 Wh kg −1 at 3491.8 W kg −1 ), exhibiting a fascinating potential for supercapacitor in large-scale applications.

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“…Nickel hydroxide (Ni(OH) 2 ) is deemed one of the most promising supercapacitor cathode materials on account of its higher electrochemical activity, clear reaction mechanism, and low price. , However, at present, its relatively low stability and conductivity cannot meet the requirements of supercapacitor cathode materials.…”

Section: Introductionmentioning

confidence: 99%

Carbon Dots Doped with Ni(OH)₂ as Thin-Film Electrodes for Supercapacitors

Han

Sang

et al. 2020

ACS Appl. Nano Mater.

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Nickel hydroxide (Ni(OH) 2 ) is one of the most attractive electrode materials for supercapacitor applications due to its intrinsically high redox capacitance. However, the electrochemical performance of the film electrode decreases dramatically with the increase in the Ni(OH) 2 loading amount, which severely obstructs its large-scale use for supercapacitors. In this work, carbon dots (CDs) in situ doped Ni(OH) 2 thin-film electrode has been fabricated by a cathodic electrodeposition approach. During the electrodeposition process, CDs intervene in the stack growth of Ni(OH) 2 crystal nuclei and create a Ball-packed porous structure different from the relatively dense aggregate for the undoped film electrode. Meantime, the size of the Ni(OH) 2 nanocrystals for the CD-doped film electrode is about 5−10 nm, far less than that of 30−50 nm for the undoped electrode. This modified thin-film electrode presents higher electrical conductivity as well as electrochemical activity (155.57 mAh/g specific capacity at 40 A/g) than that reported recently. More importantly, the specific capacity difference between the doped and undoped electrode is increased with the loading amount, implying the good doping effect of CDs even for the electrode with a thicker film. In addition, the asymmetric supercapacitor, assembled from the Ni(OH) 2 -CDs and alternating current (AC) electrodes, shows 77.5 Wh/kg energy density when the power density is up to 45.0 kW/kg. This work actually provides a reference for fabricating a high-performance Ni(OH) 2 electrode with both high electrochemical activity and large capacity.

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Three-dimensional coral-like NiCoP@C@Ni(OH)2 core-shell nanoarrays as battery-type electrodes to enhance cycle stability and energy density for hybrid supercapacitors

Cited by 188 publications

References 54 publications

High-Energy-Density Asymmetric Supercapacitor Based on a Durable and Stable Manganese Molybdate Nanostructure Electrode for Energy Storage Systems

High-Energy-Density Asymmetric Supercapacitor Based on a Durable and Stable Manganese Molybdate Nanostructure Electrode for Energy Storage Systems

Heterojunction α-Co(OH)2/α-Ni(OH)2 nanorods arrays on Ni foam with high utilization rate and excellent structure stability for high-performance supercapacitor

Carbon Dots Doped with Ni(OH)₂ as Thin-Film Electrodes for Supercapacitors

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Three-dimensional coral-like NiCoP@C@Ni(OH)2 core-shell nanoarrays as battery-type electrodes to enhance cycle stability and energy density for hybrid supercapacitors

Cited by 188 publications

References 54 publications

High-Energy-Density Asymmetric Supercapacitor Based on a Durable and Stable Manganese Molybdate Nanostructure Electrode for Energy Storage Systems

High-Energy-Density Asymmetric Supercapacitor Based on a Durable and Stable Manganese Molybdate Nanostructure Electrode for Energy Storage Systems

Heterojunction α-Co(OH)2/α-Ni(OH)2 nanorods arrays on Ni foam with high utilization rate and excellent structure stability for high-performance supercapacitor

Carbon Dots Doped with Ni(OH)2 as Thin-Film Electrodes for Supercapacitors

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Carbon Dots Doped with Ni(OH)₂ as Thin-Film Electrodes for Supercapacitors