Construction of CuCo2O4@CuCo2O4 hierarchical nanowire arrays grown on Ni foam for high-performance supercapacitors

Zhang, Yan; Xu, Jie; Zheng, Yayun; Zhang, Yingjiu; Hu, Xing; Xu, Tingting

doi:10.1039/c6ra25970g

Cited by 76 publications

(19 citation statements)

References 45 publications

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“…Figure f shows that the as-designed ASCs exhibit outstanding cycling performance (92% of the initial capacitance and high Coulombic efficiency of 104% over 2000 cycles at 5 A g –1 ). The device performance of ASCs reported in recent years is shown in Table , and our device shows obviously enhanced performance compared with those of other devices. ,,,,− The excellent performance of devices can be attributed to the following reasons: The MnMoO 4 ultrathin nanosheet arrays directly grow on NF with an integrated architecture ensuring intimate contacts and providing excellent electron transport pathways between the charge collecting substrates of NF and each MnMoO 4 nanosheet. Moreover, the 3D interconnected ultrathin nanosheet array structure not only exposes more electroactive sites for reversible Faradaic reactions but also shortens the ion and electron diffusion paths.…”

Section: Resultsmentioning

confidence: 79%

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: 79%

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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“…The CoO@CuO/Ni//AC ASCs showed a high energy density of 20.2 Wh kg À 1 at 800 W kg À 1 . The high energy density should result from the unique layered heterostructure, combined with three-dimensional grid structure, leading to the promoted charge transfer and improved energy density which are superior to or comparable with some of those recently reported energy storage devices, such as MgCo 2 O 4 hybrid device (12.99 Wh kg À 1 ), [36] NiÀ Co oxide//AC (10.8 Wh kg À 1 ), [37] CuCo 2 O 4 @CuCo 2 O 4 //AC (18 Wh kg À 1 ), [38] Cu 2 O/CuO/Co 3 O 4 //AG (12 Wh kg À 1 ), [39] NiCo 2 O 4 NSs@HMRAs//AC (15.4 Wh kg À 1 ) [40] and NiCo 2 O 4 -MnO 2 //AG (9.4 Wh kg À 1 ). [41] As displayed in Figure 5h, the as-fabricated CoO@CuO/Ni//AC ASCs device presented well cycling stability and 93.79 % of capacitance still maintained after 6000 cycles.…”

Section: Chemelectrochemmentioning

confidence: 80%

Dandelion‐like Nanospheres Synthesized by CoO@CuO Nanowire Arrays for High‐Performance Asymmetric Supercapacitors

Huang

Zhong

et al. 2022

ChemElectroChem

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Recently, three-dimensional-structure materials have attracted enormous attention in energy-storage fields on account of their excellent electrochemical performance. In this study, hierarchical nanospheres consisting of mesoporous CoO@CuO nanowires on a three-dimensional conductive Ni foam are prepared by a one-step hydrothermal method combined with a subsequent annealing process. Compared to CoO or CuO alone, the as-obtained CoO@CuO/Ni hybrid nanowires show good electronic conductivity owning to the abundant existence of O vacancies in them. In a three-electrode system, the area capacitance of the prepared CoO@CuO/Ni electrode reaches 2.94 F cm À 2 (1.32 C cm À 2 ) at 1 mA cm À 2 , and the CoO@CuO/Ni electrode presents an outstanding cycle performance. Moreover, a CoO@CuO/Ni//AC ASC asymmetric supercapacitor is fabricated and found to display a high energy density of 20.22 Wh kg À 1 at 800 W kg À 1 . Hence, this novel CoO@CuO/Ni hybrid nanowires with excellent electrochemical properties shows outstanding potential in the practical application of high-energy storage devices.

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“…26 The CuO nanoneedles provided the mechanical strength to the structure as it showed a very uniform, thin, and rupture-free growth, thereby protecting the underlying CuCo 2 O 4 nanorods and thus improving its sustainability during the redox reaction. 27 Eventually, the emerged CuO nanoneedles serve as the anchor and prevent detaching from the nanorods.…”

Section: Resultsmentioning

confidence: 99%

CuCo₂O₄ Nanorods Coated with CuO Nanoneedles for Supercapacitor Applications

Kamble

Rasal

Gaikwad

et al. 2021

ACS Appl. Nano Mater.

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Herein, we report the chemical synthesis of a core−shell nanoarchitecture comprising CuCo 2 O 4 @CuO (CCO@ CuO) on a flexible stainless steel mesh substrate (FSSM) with CuCo 2 O 4 (core) and CuO (shell) by a simple, cost-efficient, additivefree hydrothermal deposition method, followed by successive ionic layer adsorption and reaction method for fabricating a flexible electrode for an asymmetric supercapacitor (ASC). The nanocomposite of CCO@CuO revealed a high surface area of 98.33 m 2 g −1 and the electrode delivered a high specific capacitance of 713 F g −1 at a high current density of 11 mA cm −2 , which was noted to be higher than those of the individual constituent CuO (436 F g −1 ) and CuCo 2 O 4 (443 F g −1 ) metal oxide electrodes. The CCO@CuO electrode demonstrated remarkable cycling stability (∼90% capacitance retention after 5000 charge−discharge cycles at 15 mA cm −2 ). The ASC device CCO@CuO//rGO (reduced graphene oxide) delivered a maximum energy density of 37.43 Wh kg −1 at a power density of 250 W kg −1 . The device revealed 83% capacitance retention after 4000 cycles. These results indicate that the CCO@CuO/FSSM electrode is a promising functional material for energy storage devices.

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Construction of CuCo₂O₄@CuCo₂O₄ hierarchical nanowire arrays grown on Ni foam for high-performance supercapacitors

Abstract: CuCo2O4@CuCo2O4 hierarchical nanowire arrays were fabricated directly on Ni foam via a two-step method. The binder-free electrode displayed high electrochemical performance with excellent cycling stability.

Cited by 76 publications

References 45 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

Dandelion‐like Nanospheres Synthesized by CoO@CuO Nanowire Arrays for High‐Performance Asymmetric Supercapacitors

CuCo₂O₄ Nanorods Coated with CuO Nanoneedles for Supercapacitor Applications

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Construction of CuCo2O4@CuCo2O4 hierarchical nanowire arrays grown on Ni foam for high-performance supercapacitors

Abstract: CuCo2O4@CuCo2O4 hierarchical nanowire arrays were fabricated directly on Ni foam via a two-step method. The binder-free electrode displayed high electrochemical performance with excellent cycling stability.

Cited by 76 publications

References 45 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

Dandelion‐like Nanospheres Synthesized by CoO@CuO Nanowire Arrays for High‐Performance Asymmetric Supercapacitors

CuCo2O4 Nanorods Coated with CuO Nanoneedles for Supercapacitor Applications

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Construction of CuCo₂O₄@CuCo₂O₄ hierarchical nanowire arrays grown on Ni foam for high-performance supercapacitors

CuCo₂O₄ Nanorods Coated with CuO Nanoneedles for Supercapacitor Applications