Nanoforest of hierarchical Co3O4@NiCo2O4 nanowire arrays for high-performance supercapacitors

Zhang, Hang; Wang, Taihong; Yu, Xiao; Zhang, Haonan; Duan, Huigao; Lu, Bingan

doi:10.1016/j.nanoen.2013.07.008

Cited by 282 publications

(125 citation statements)

References 41 publications

Supporting

Mentioning

124

Contrasting

Unclassified

Order By: Relevance

“…First, the three-dimensional homogeneous core/shell architecture greatly enhances the surface areas that ensure a large number of electroactive sites for redox reaction. 36 Second, the formation of rich and welldefined micro/nano-structures provides many ion transport pathways for quick electrolyte ion diffusion and electron transfer. 37,38 Third, the porous core/shell nanowire arrays directly grow on the conductive substrate, which can avoid the appearance of "dead volume" in electrode materials caused by existence of polymer binder and conductive additives.…”

mentioning

confidence: 99%

Construction of Three-Dimensional Homogeneous NiCo₂O₄Core/Shell Nanostructure as High-Performance Electrodes for Supercapacitors

Liu

Zhang

Yang

et al. 2015

J. Electrochem. Soc.

View full text Add to dashboard Cite

A novel three-dimensional homogeneous NiCo 2 O 4 core/shell nanowire arrays were first fabricated via a facile synthesis strategy on nickel foam as advanced binder-free electrodes. The structure and morphology of the as-synthesized samples have been characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Energy dispersive X-ray spectrometry (EDS) and transmission electron microscopy (TEM). This novel NiCo 2 O 4 /NiCo 2 O 4 core/shell nanowire arrays exhibited superior electrochemical performances, including high specific capacitance of 2041 F g −1 at current density of 5 mA cm −2 , excellent rate performance with a capacitance retention of 88% as the current density increases from 5 to 50 mA cm −2 and good long-term cyclic stability. These outstanding electrochemical characteristics are mainly attributed to the superstructure, which provides a large number of electroactive sites for redox reaction, shortens the ion diffusion paths and enhances the morphological stability in the electrochemical process. Electrochemical supercapacitors (ES) are considered as a kind of important next-generation devices in the energy storage field because of their many advantages of high rate performance, suitable ratio between power density and energy density, long life cycle. 1-5As we know, electrode materials play a key role in determinating the performance of ES. Therefore, recent studies have been concentrated on developing appropriate materials with ideal characteristics of high surface area, good electrical conductivity and cycle stability for high-performance ES. To date, three major types of materials have been reported as the electrode materials for ES, including carbonaceous materials, 6-8 conducting polymers 9-11 and transition metal oxides/hydroxides. 12-14Of these various materials, transition metal oxides have attracted significant attention, due to they can achieve much higher capacity of storage charge than carbonaceous materials and better cycling performance than polymer materials. Hydrous RuO 2 exhibiting the remarkable pseudocapacitive behavior was recognized as the best electrode materials, but the high cost and toxicity hinder its widely commercial application. 15,16 In order to reduce the cost of precious metal use, great efforts have been made to investaging cheaper transition metal oxides with high rate and quasi-reversible of electrochemistry reaction and environmental friendliness to replace RuO 2 , such as MnO 2 , V 2 O 5 , Co 3 O 4 , ZnO, SnO 2 , NiO and their composites. [17][18][19][20][21][22][23] Recently, spinel nickel cobaltite (NiCo 2 O 4 ) has been proposed as a very potential alternative for electrode materials of ES, because its distinguished features of low cost and toxicity, high electrochemical response capacity, environmental friendliness and natural abundance. Moreover, compared to single-component oxides of cobalt oxide and nickel oxide, NiCo 2 O 4 can provide both nickel and cobalt ions for rich redox reactions, so it is expected to achieve higher capacitance and e...

show abstract

mentioning

confidence: 99%

Construction of Three-Dimensional Homogeneous NiCo₂O₄Core/Shell Nanostructure as High-Performance Electrodes for Supercapacitors

Liu

Zhang

Yang

et al. 2015

J. Electrochem. Soc.

View full text Add to dashboard Cite

show abstract

“…The slope of the curves represents the Warburg impedance (W) in low frequency area, which shows the electrolyte diffusion in the electrode and proton diffusion in active materials. The Co 3 O 4 @ZnCo 2 O 4 hybrid NWAs electrode shows a larger slope than Co 3 O 4 NWAs electrode, implying the more excellent capacitive characteristics and the lower ion diffusion resistance [41,[43][44]. The equivalent circuit diagram is shown in the inset of Fig.…”

Section: Resultsmentioning

confidence: 99%

Hierarchical mesoporous Co3O4@ZnCo2O4 hybrid nanowire arrays supported on Ni foam for high-performance asymmetric supercapacitors

Yang

Huang

et al. 2018

Sci. China Mater.

View full text Add to dashboard Cite

show abstract

“…It is evident that the peak current increases with the increasing scan rate, while the position of the redox peaks shifts slightly, suggesting that the electronic and ionic transport rates are rapid enough at the scan rates presented. 39 The galvanostatic charge-discharge …”

Section: Resultsmentioning

confidence: 99%

Construction of Hierarchical Ni(OH)₂@CoMoO₄ Nanoflake Composite for High-Performance Supercapacitors

Lin

Zhang

et al. 2016

NANO

View full text Add to dashboard Cite

Hierarchical Ni(OH) 2 @CoMoO 4 nano°ake composite on Ni foam was successfully constructed by electrodepositing Ni(OH) 2 onto CoMoO 4 nano°ake and investigated as binder-free electrodes for supercapacitor. The composite shows a large areal capacitance of 5.23 F cm À2 at current density of 8 mA cm À1 , and a capacitance retention of 82.5% after 1000 cycles. The high electrochemical performances can be attributed to the hierarchical nano°akes structure and the synergetic e®ect between Ni(OH) 2 nanosheets and CoMoO 4 nano°akes. This work demonstrates that Ni (OH) 2 @CoMoO 4 nano°ake composite is highly desirable for application as advanced electrochemical electrode material.

show abstract

Nanoforest of hierarchical Co3O4@NiCo2O4 nanowire arrays for high-performance supercapacitors

Cited by 282 publications

References 41 publications

Construction of Three-Dimensional Homogeneous NiCo₂O₄Core/Shell Nanostructure as High-Performance Electrodes for Supercapacitors

Construction of Three-Dimensional Homogeneous NiCo₂O₄Core/Shell Nanostructure as High-Performance Electrodes for Supercapacitors

Hierarchical mesoporous Co3O4@ZnCo2O4 hybrid nanowire arrays supported on Ni foam for high-performance asymmetric supercapacitors

Construction of Hierarchical Ni(OH)₂@CoMoO₄ Nanoflake Composite for High-Performance Supercapacitors

Contact Info

Product

Resources

About

Nanoforest of hierarchical Co3O4@NiCo2O4 nanowire arrays for high-performance supercapacitors

Cited by 282 publications

References 41 publications

Construction of Three-Dimensional Homogeneous NiCo2O4Core/Shell Nanostructure as High-Performance Electrodes for Supercapacitors

Construction of Three-Dimensional Homogeneous NiCo2O4Core/Shell Nanostructure as High-Performance Electrodes for Supercapacitors

Hierarchical mesoporous Co3O4@ZnCo2O4 hybrid nanowire arrays supported on Ni foam for high-performance asymmetric supercapacitors

Construction of Hierarchical Ni(OH)2@CoMoO4 Nanoflake Composite for High-Performance Supercapacitors

Contact Info

Product

Resources

About

Construction of Three-Dimensional Homogeneous NiCo₂O₄Core/Shell Nanostructure as High-Performance Electrodes for Supercapacitors

Construction of Three-Dimensional Homogeneous NiCo₂O₄Core/Shell Nanostructure as High-Performance Electrodes for Supercapacitors

Construction of Hierarchical Ni(OH)₂@CoMoO₄ Nanoflake Composite for High-Performance Supercapacitors