Superior performance asymmetric supercapacitors based on ZnCo2O4@MnO2core–shell electrode

Ma, Wenqin; Nan, Honghong; Gu, Zhengxiang; Geng, Baoyou; Zhang, Xiaojun

doi:10.1039/c5ta00012b

Cited by 159 publications

(71 citation statements)

References 58 publications

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“…[29] Negativee lectrode materials commonly used in ASCs include carbon-based materials (AC, CNTs, and graphene), [15] metal oxides( Fe 2 O 3, MoO 3, WO 3, MnO 2 , [55] In 2 O 3 , [56] and Bi 2 O 3 ), [57] and metal nitrides( TiN, VN, Mo 2 N, and WON). Different combinations of positive and negative electrodes have been studied in the presence of different electrolytes to analyze their performance.…”

Section: Configurationmentioning

confidence: 99%

Biomass‐Derived Carbon: A Value‐Added Journey Towards Constructing High‐Energy Supercapacitors in an Asymmetric Fashion

et al. 2019

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Section: Configurationmentioning

confidence: 99%

Biomass‐Derived Carbon: A Value‐Added Journey Towards Constructing High‐Energy Supercapacitors in an Asymmetric Fashion

et al. 2019

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“…In view of the above findings, the rational design of composites is possibly beneficial to sufficient utilization of the active materials or improvement of electrical conductivity to boost the electrochemical performances. Ma et al . prepared hierarchical ZnCo 2 O 4 @MnO 2 core‐shell arrays electrode exhibited a ultrahigh specific capacitance of 1981 F g −1 at current density of 5 A g −1 , which avoided the impact of polymer binder and conductive additives to aggrandize the effective use of electrode materials.…”

Section: Introductionmentioning

confidence: 99%

Hierarchical Nickel Cobaltate/Manganese Dioxide Core‐Shell Nanowire Arrays on Graphene‐Decorated Nickel Foam for High‐Performance Supercapacitors

et al. 2017

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Hierarchical NiCo2O4@MnO2 core‐shell nanowire arrays have been synthesized on graphene‐nickel foam as binder‐free electrodes. The thickness of MnO2 nanosheets can be controlled by different hydrothermal reaction times, and a whole array of unique NiCo2O4@MnO2 nanostructures have been synthesized and investigated successfully for supercapacitor applications. The graphene deposited on nickel foam can enhance the electrical conductivity of electrode materials and strengthen corrosion resistance of the current collector. As a result, NiCo2O4@MnO2 core‐shell arrays electrode exhibits an ultra‐high specific capacitance of 2125 F g−1 at a current density of 1 A g−1, outstanding cycling stability (93.4 % of its initial value after 5000 cycles) and good rate performance. In addition, an asymmetric supercapacitor based on NiCo2O4@MnO2 as the positive electrode and activated graphene (AG) as the negative electrode achieves an energy density of 27.8 Wh kg−1 at a power density of 400.3 W Kg−1. These notable findings suggest that the unique NiCo2O4@MnO2 core‐shell nanostructure on graphene‐nickel foam is a potential candidate for application as a high‐performance supercapacitor electrode.

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“…z E-mail: deb.sarkar1985@gmail.com; akshukla2006@gmail.com; sarma@iisc.ac.in cal conductivity (10 −5 -10 −6 S/cm), which affects the rate capability of the supercapacitors, but this limitation could be circumvented through nanostructured core-shell electrode design. 6,8,11,25 Ironically, the use of α-Fe 2 O 3 as positive electrode material is rather limited owing to its poor electrochemical performance within the positive potential ranges. 8,26 Interestingly, pristine/doped 1D nanostructures, like nanorods and nanowires of α-Fe 2 O 3 can be used as a conducting scaffold for supporting other pseudocapacitive materials owing to their enhanced electronic conductivity (10 −2 -10 −5 S/cm) as compared to their bulk counterpart.…”

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confidence: 99%

α-Fe₂O₃-Based Core-Shell-Nanorod–Structured Positiveand Negative Electrodes for a High-Performance α-Fe₂O₃/C//α-Fe₂O₃/MnO_xAsymmetric Supercapacitor

Sarkar

Pal

Mandal

et al. 2017

J. Electrochem. Soc.

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A α-Fe 2 O 3 /MnO x core-shell nanorod (NR)-based positive electrode is designed combining the traits of α-Fe 2 O 3 and MnO x with an ultrathin MnO x shell serving as active site for surface or near-surface based fast and reversible faradaic-reactions and α-Fe 2 O 3 NR core facilitating electron transfer toward the current collector. The α-Fe 2 O 3 /MnO x core-shell NR electrode shows ameliorated electrochemical performance in terms of capacitance and rate capability within the potential window of 0-1 V in relation to both pristine α-Fe 2 O 3 NR electrode and pristine MnO x thin film electrode. Similarly, α-Fe 2 O 3 /C core-shell NR negative electrode is also realized. The assembled α-Fe 2 O 3 /C//α-Fe 2 O 3 /MnO x core-shell NR asymmetric supercapacitor (ASC) exhibits a volumetric capacitance of ∼ 1.28 F/cm 3 at a scan rate of 10 mV/s with nearly 78% capacitance retention at the scan rate of 400 mV/s within a potential window of 0-2 V in aqueous electrolyte medium. Interestingly, the ASC delivers a maximum energy-density of ∼ 0.64 mWh/cm 3 and a maximum power-density of 155 mW/cm 3 , which are higher than the values obtained for α- By 2050, global electrical energy demand is likely to reach 28 TW.1,2 Production of such a humungous amount of carbonneutral energy would necessitate the exploitation of renewable energy sources, like solar and wind.3,4 Furthermore, electrical energy storage would be required for unimpaired integration of electricity generated from these sources to the grid. For large-scale electrochemical storage to be viable, the materials used and devices produced need to be costeffective, besides being long-lasting and safe. Indeed, high specific energy and high power densities are of lesser concern in this regard. Accordingly, chemistries that make use of aqueous electrolytes are favorable candidates for large scale energy storage. It is noteworthy that as the renewable energy resources are intermittent, it would be desirable to store the energy from these sources as quickly as possible.Recently, supercapacitors (SCs) have emerged as a new class of storage devices that can be charged quickly with higher powerdensities than storage batteries. [5][6][7] However, their energy densities still remain limited and there is a definite need to increase it to cope with the global energy demand for electric traction and nextgeneration portable electronic devices. 8 The energy density of supercapacitors can be enhanced by increasing their capacitance as well as their operating-potential window, which can be achieved more easily with asymmetric supercapacitors (ASCs) than with the symmetric supercapacitors (SSCs) since, with suitable combination of positive and negative electrode materials, the operational potential window as high as 2 V has been achieved even with aqueous electrolytes. 6,[9][10][11][12][13][14] In recent years, efforts have been expended to explore several ASCs with different electrode materials based on redox-active transition-metal oxides, like RuO 2 ,

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Superior performance asymmetric supercapacitors based on ZnCo₂O₄@MnO₂core–shell electrode

Abstract: In this study, a hierarchical ZnCo2O4@MnO2 core–shell nanotube arrays electrode was developed by a facile two-step method.

Cited by 159 publications

References 58 publications

Biomass‐Derived Carbon: A Value‐Added Journey Towards Constructing High‐Energy Supercapacitors in an Asymmetric Fashion

Biomass‐Derived Carbon: A Value‐Added Journey Towards Constructing High‐Energy Supercapacitors in an Asymmetric Fashion

Hierarchical Nickel Cobaltate/Manganese Dioxide Core‐Shell Nanowire Arrays on Graphene‐Decorated Nickel Foam for High‐Performance Supercapacitors

α-Fe₂O₃-Based Core-Shell-Nanorod–Structured Positiveand Negative Electrodes for a High-Performance α-Fe₂O₃/C//α-Fe₂O₃/MnO_xAsymmetric Supercapacitor

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Superior performance asymmetric supercapacitors based on ZnCo2O4@MnO2core–shell electrode

Abstract: In this study, a hierarchical ZnCo2O4@MnO2 core–shell nanotube arrays electrode was developed by a facile two-step method.

Cited by 159 publications

References 58 publications

Biomass‐Derived Carbon: A Value‐Added Journey Towards Constructing High‐Energy Supercapacitors in an Asymmetric Fashion

Biomass‐Derived Carbon: A Value‐Added Journey Towards Constructing High‐Energy Supercapacitors in an Asymmetric Fashion

Hierarchical Nickel Cobaltate/Manganese Dioxide Core‐Shell Nanowire Arrays on Graphene‐Decorated Nickel Foam for High‐Performance Supercapacitors

α-Fe2O3-Based Core-Shell-Nanorod–Structured Positiveand Negative Electrodes for a High-Performance α-Fe2O3/C//α-Fe2O3/MnOxAsymmetric Supercapacitor

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Superior performance asymmetric supercapacitors based on ZnCo₂O₄@MnO₂core–shell electrode

α-Fe₂O₃-Based Core-Shell-Nanorod–Structured Positiveand Negative Electrodes for a High-Performance α-Fe₂O₃/C//α-Fe₂O₃/MnO_xAsymmetric Supercapacitor