Facile preparation of hovenia-acerba-like hierarchical MnO2/C composites and their excellent energy storage performance for supercapacitors

Li, Qun; He, Jijia; Liu, Dequan; Yue, Hongwei; Bai, Shuai; Liu, Boli; Gu, Lili; He, Dawei

doi:10.1016/j.jallcom.2016.09.259

Cited by 32 publications

(11 citation statements)

References 40 publications

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“…In addition, comparing with the BC electrode, the MnO 2 /BC electrode exhibits much larger Rct, Rs and electrolyte ion diffusion, which is mainly due to the poor electric conductivity of MnO 2 , partially blocked pores of the BC and the decrease of BET specific surface area. These results coincide with other reports [ 20 , 39 ].…”

Section: Resultssupporting

confidence: 94%

“…Li et al also used a chemical precipitation method when designing MnO 2 nanoflakes/hierarchical porous carbon nanocomposites with a great improvement in specific capacitance (326.9 F g −1 at 1 A g −1 ) [ 19 ]. Li et al reported hovenia-acerba-like hierarchical MnO 2 /C hybrids which showed a performance of 132 F g −1 at 0.5 A g −1 [ 20 ].…”

Section: Introductionmentioning

confidence: 99%

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A Novel Radiation Method for Preparing MnO2/BC Monolith Hybrids with Outstanding Supercapacitance Performance

Yang

Liu

et al. 2018

Nanomaterials

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A novel facile process for fabrication of amorphous MnO2/bamboo charcoal monolith hybrids (MnO2/BC) for potential supercapacitor applications using γ-irradiation methods is described. The structural, morphological and electrochemical properties of the MnO2/BC hybrids have been investigated using X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), cyclic voltammetry (CV), galvanostatic charge/discharge (GCD) and electrochemical impedance spectroscopy (EIS) techniques. The combination of BC (electrical double layer charge) and MnO2 (pseudocapacitance) created a complementary effect, which enhanced the specific capacitance and good cyclic stability of the MnO2/BC hybrid electrodes. The MnO2/BC hybrids showed a higher specific capacitance (449 F g−1 at the constant current density of 0.5 A g−1 over the potential range from –0.2 V to 0.8 V), compared with BC (101 F g−1) in 1 M of Na2SO4 aqueous electrolyte. Furthermore, the MnO2/BC hybrid electrodes showed superior cycling stability with 78% capacitance retention, even after 10,000 cycles. The experimental results demonstrated that the high performance of MnO2/BC hybrids could be a potential electrode material for supercapacitors.

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Section: Resultssupporting

confidence: 94%

Section: Introductionmentioning

confidence: 99%

A Novel Radiation Method for Preparing MnO2/BC Monolith Hybrids with Outstanding Supercapacitance Performance

Yang

Liu

et al. 2018

Nanomaterials

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“…Further, the assembled device exhibits reasonable cycling stability of 81.6 % of its capacitance over 8000 cycles. Thus, it provides a new approach for the development of 1D core‐shell heterostructures with improved electrochemical performance [121,122] …”

Section: Mnco2o4 and Its Hybridsmentioning

confidence: 99%

Progress in Spinel‐Structured Cobaltite‐Based Positive Electrode Materials for Supercapacitors

2022

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In recent days, the family of spinel cobaltites with multiple oxidation states has received much attention as an electrode material for supercapacitors. Profiting from its superior electrochemical performance, these cobaltites play a significant role in energy storage and conversion devices. In this review, we provided an in‐depth description of spinel cobaltites. Further, we review several cobaltites and their composites, corresponding synthesis methods, and the application of these materials for supercapacitors. As a result of several extraordinary outputs, spinel cobaltites are likely to be widely studied in the future.

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“…The hovennia-acerba-like MnO 2 /C composites with different hierarchical morphologies showed an excellent electrochemical performance owing to its unique framework structure and hierarchical morphology. The 3D porous carbon framework served as a good conductive channel for electrons and the hierarchical morphology led to the diffusion of electrolyte ions on the electrode surface [73]. Similarly, the 3D porous carbon framework supporting on nanostructures MnO 2 can be also applied to the other carbon-based composites for high-performance supercapacitors.…”

Section: Metal Oxide /Carbon Composites As Pseudocapacitors Electrode Materialsmentioning

confidence: 99%

Sol-gel synthesis of transition metal oxides based electrode materials for supercapacitors

Sud

2018

Nanocomposites for Electrochemical Capacitors

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Supercapacitors are electrochemical devices used for portable consumer electronics devices, electric devices, and large-scale grids. The advantageous features of supercapacitors are high power density, fast charge /discharge rate long life cycle, a wide range of operating temperature (-40 to 70 o C), environment-friendly and low maintenance cost. Supercapacitors store the charge either by ion adsorption at the electrode/electrolyte interface (electrochemical double layer capacitors) or reversible Faradaic reactions (pseudocapacitors). Most of the commercial supercapacitors store energy by electric double layer formation and utilize the carbon as an electrode material. Carbon-based electrode materials have excellent cycling stability, high lifetime cycle and economic viability but low energy density (3-5Wh/Kg) and poor electrochemical stability are the limitations. Transition metal oxides have been considered suitable candidates for the energy storage by pseudocapacitance. The metal oxides also provide higher energy density and better electrochemical stability. Sol-gel is a simple and cheap method of synthesis which yields the products of high purity and good homogeneity. Sol-gel methods have been successfully developed to prepare many metal oxides such as TiO

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Facile preparation of hovenia-acerba-like hierarchical MnO2/C composites and their excellent energy storage performance for supercapacitors

Cited by 32 publications

References 40 publications

A Novel Radiation Method for Preparing MnO2/BC Monolith Hybrids with Outstanding Supercapacitance Performance

A Novel Radiation Method for Preparing MnO2/BC Monolith Hybrids with Outstanding Supercapacitance Performance

Progress in Spinel‐Structured Cobaltite‐Based Positive Electrode Materials for Supercapacitors

Sol-gel synthesis of transition metal oxides based electrode materials for supercapacitors

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