Rational construction of bowl-like MnO2 nanosheets with excellent electrochemical performance for supercapacitor electrodes

Liu, Panbo; Zhu, Yade; Gao, Xiaogang; Zhang, Shuai; Wang, Yi; Qin, Shuyi; Zhang, Yiqing

doi:10.1016/j.cej.2018.05.169

Cited by 185 publications

(45 citation statements)

References 71 publications

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“…[12][13][14][15][16][17] Furthermore, the morphology of the electrode materials has significant influence on their electrochemical performances. [18,19] Some particular morphology such as porous nanowires and nanoflakes with high surface to volume ratio can provide more active sites for electrochemical energy storage. For example, one-dimensional (1D) MnCo 2 O 4 nanowires as an electrode material for supercapacitors have shown a capacitance of 1342 F g -1 at 1 A g À 1 .…”

Section: Introductionmentioning

confidence: 99%

A MnCo₂O₄@NiMoO₄ Core‐Shell Composite Supported on Nickel Foam as a Supercapacitor Electrode for Energy Storage

2018

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A MnCo2O4@NiMoO4 composite was synthesized on nickel foam by a two‐step method. The composite has a core‐shell structure in which MnCo2O4 nanoneedles are wrapped by NiMoO4 nanoflakes. The MnCo2O4@NiMoO4/Ni foam is applied as a binder‐free electrode for supercapacitors and it achieves a specific capacitance of up to 1718 F g−1 at a current density of 1 A g−1, and 84 % capacitance retention after 6000 charge‐discharge cycles. The capacitance of the MnCo2O4@NiMoO4 composite is much higher than MnCo2O4 nanoneedles and NiMoO4 nanoflakes alone. Moreover, a hybrid supercapacitor is assembled by applying the MnCo2O4@NiMoO4/Ni foam as the positive electrode, activated carbon/Ni foam as the negative electrode. The hybrid supercapacitor reaches an energy density of up to 42.3 W h kg−1 at a power density of 797 W kg−1, a power density of 6256 W kg−1 at an energy density of 17.4 W h kg−1, and 86 % capacitance retention after 2000 charge‐discharge cycles. The results suggest that the rational design of electrode materials with such structure and composition is an effective strategy to improve electrochemical performance.

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Section: Introductionmentioning

confidence: 99%

A MnCo₂O₄@NiMoO₄ Core‐Shell Composite Supported on Nickel Foam as a Supercapacitor Electrode for Energy Storage

2018

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“…Then, calculated amounts of NiCl 2 •6H 2 O and CoCl 2 •6H 2 O were added into the solution. Driven by the electrostatic interaction between the metal ions and the -SO 3 H groups, the metal ions could be adsorbed on the surfaces of the bowl-like PS particles [37,38,40]. Through the hydrothermal treatment at 90°C, bowl-like Ni-Co precursor/PS particles were obtained, which were finally converted to the bowl-like NiCo 2 O 4 nanosheet clusters via thermal annealing at 550°C in the air.…”

Section: Structural Characterizationsmentioning

confidence: 99%

“…However, with excessive void interior space, hollow structures usually show decreased bulk volumetric density when serving as electrode materials, which is disadvantageous to small-volume energy storage devices [5, 34,35]. As a unique class of hollow structures, bowllike structures show an advantage in increasing the volumetric packing density of electrode materials compared with their spherical hollow counterparts, which may contribute to the improvement of volumetric energy density of supercapacitors [36][37][38][39][40][41][42]. Meanwhile, it has proven that 2D sheet-like structures favor the electronic/ ionic transport in electrodes, thus increasing the specific capacitance and the rate capability [10,11,[13][14][15]43].…”

Section: Introductionmentioning

confidence: 99%

“…) and long-time cycling stability (90% after 5000 cycles at 1 A g −1 ). Compared with their spherical counterparts, i.e., NiCo 2 O 4 hollow spheres [30][31][32]44], electrodes made of such bowl-like NiCo 2 O 4 nanosheet clusters show much higher specific capacitance and smaller volume [40]. Furthermore, the bowl-like NiCo 2 O 4 nanosheet clusters and commercial activated carbon (AC) were employed as the two electrodes of an asymmetric supercapacitor (ASC [21,22,25,27,[45][46][47][48][49][50][51][52] as well as those of many commercial supercapacitors [46,53].…”

Section: Introductionmentioning

confidence: 99%

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Bowl-shaped NiCo2O4 nanosheet clusters as electrode materials for high-performance asymmetric supercapacitors

Liu

Zheng

et al. 2020

Sci. China Mater.

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The development of transition metal oxidebased electrode materials with proper controlled structures is highly desirable for high-performance supercapacitors. However, it remains a major challenge. Here, we present the first synthesis of bowl-like NiCo 2 O 4 nanosheet clusters through a simple soft template guided hydrothermal strategy. The resulting bowl-like clusters consist of numerous NiCo 2 O 4 nanosheets with an average thickness of 19 nm and possess a mean diameter of 1 µm along with a specific surface area of 40 m 2 g −1. Remarkably, serving as an electrode material in a three-electrode system, the bowl-like NiCo 2 O 4 nanosheet clusters exhibit a high specific capacity of 1068 F g −1 at a current density of 1 A g −1 and excellent cycling stability with 90% capacitance retention after 5000 charge-discharge cycles. Meanwhile, an asymmetric supercapacitor (ASC) assembled with the NiCo 2 O 4 clusters and activated carbon (AC) as the two electrodes exhibits a high specific capacitance of 129 F g −1 at 1 A g −1 , along with a high energy density of 33 W h kg −1 at a power density of 0.66 kW kg −1. Such performance is superior to those of many commercial supercapacitors. This study opens a new avenue for the construction of ordered complex particles with controlled architectures for energy storage and conversion applications.

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“…Among anode materials, MnO 2 exhibits a low cost and excellent electrochemical properties, gradually becoming a substitute of expensive rare metal oxides. For example, Liu et al developed bowl-like MnO 2 nanosheets presenting a specific capacitance of 379 F g -1 at a current density of 0.5 A g -1 while the capacitance retained ratio of 60.5% from 0.5 to 10 A g -1 and after 5000 times the capacitance can maintain 87.3% of the original value [10] . Besides, Won-Sub Yoon et al reported a l-MnO 2 3D nanoarchitecture for LIBs with high capacities of ~1400 mAh g -1 at 100 mA g -1 and ~749 mAh g -1 at 1000 mA g -1 [11] .…”

Section: Introductionmentioning

confidence: 99%

Construction of MnO2 Nanowire for a High-Performance Lithium Ion Supercapacitor

Wang¹,

Shi²,

Su³

et al. 2019

Res. Appl. Mater. Sci.

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Developing lithium ion capacitors possessing both brilliant energy and power density is still significant for numerous researchers. In this paper, we synthesize MnO2 nanowires via a simple hydrothermal process. The nanostructure MnO2 can expose more electrochemical sites and thus optimize the kinetics of Li+. Moreover, we use MnO2 nanowires (MnO2 NWs) as anode and a N-doped porous carbon (NPC) as cathode to assemble lithium ion capacitors (MnO2 NWs//NPC LIC). Compared to the traditional supercapacitor with aqueous electrolyte, the MnO2 NWs//NPC LIC exhibits a wider voltage of 0-4.2 V, which is helpful to enhance its energy and power density. Furthermore, MnO2 NWs//NPC LIC can deliver an excellent capacity of 150 mAh g-1 with a excellent energy density of 82.7 Wh kg-1 and power density of 1.05 kW kg-1. Meanwhile, a good cyclic stability of LICs with a 20% retention after 1000 times charge and discharge process proves its practical potential, indicating a good promising for the application in storage devices.

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Rational construction of bowl-like MnO2 nanosheets with excellent electrochemical performance for supercapacitor electrodes

Cited by 185 publications

References 71 publications

A MnCo₂O₄@NiMoO₄ Core‐Shell Composite Supported on Nickel Foam as a Supercapacitor Electrode for Energy Storage

A MnCo₂O₄@NiMoO₄ Core‐Shell Composite Supported on Nickel Foam as a Supercapacitor Electrode for Energy Storage

Bowl-shaped NiCo2O4 nanosheet clusters as electrode materials for high-performance asymmetric supercapacitors

Construction of MnO2 Nanowire for a High-Performance Lithium Ion Supercapacitor

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Rational construction of bowl-like MnO2 nanosheets with excellent electrochemical performance for supercapacitor electrodes

Cited by 185 publications

References 71 publications

A MnCo2O4@NiMoO4 Core‐Shell Composite Supported on Nickel Foam as a Supercapacitor Electrode for Energy Storage

A MnCo2O4@NiMoO4 Core‐Shell Composite Supported on Nickel Foam as a Supercapacitor Electrode for Energy Storage

Bowl-shaped NiCo2O4 nanosheet clusters as electrode materials for high-performance asymmetric supercapacitors

Construction of MnO2 Nanowire for a High-Performance Lithium Ion Supercapacitor

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A MnCo₂O₄@NiMoO₄ Core‐Shell Composite Supported on Nickel Foam as a Supercapacitor Electrode for Energy Storage

A MnCo₂O₄@NiMoO₄ Core‐Shell Composite Supported on Nickel Foam as a Supercapacitor Electrode for Energy Storage