3D binder-free Cu<sub>2</sub>O@Cu nanoneedle arrays for high-performance asymmetric supercapacitors

Dong, Chaoqun; Wang, Yan; Xu, Junling; Cheng, Guanhua; Yang, Wanfeng; Kou, Tianyi; Zhang, Zhonghua; Ding, Yi

doi:10.1039/c4ta04329d

Cited by 184 publications

(91 citation statements)

References 48 publications

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“…This shi in peak position is related to internal resistance of the electrode, which conrms the pseudocapacitive characteristics. 35,48 Indeed, this shi was attributed to an increase in the charge diffusion polarization with the pseudocapacitive electrode. 49 The increase in the current response with the scan rate also suggests that the kinetics of interfacial faradic redox reactions and the rates of electronic and ionic transport are signicantly fast even when the scan rate is as high as 100 mV s À1 .…”

Section: Resultsmentioning

confidence: 99%

“…28 As shown in the CV curve, the anodic peak appears due to the oxidation of Cu 2 O microstructure to CuO and Cu(OH) 2 . 35 The cathodic peak can be ascribed to the reduction of CuO and Cu(OH) 2 to Cu 2 O. The following reactions between Cu(I) and Cu(II) species exist as described in reactions (3) and (4).…”

Section: Resultsmentioning

confidence: 99%

“…32,33 Among the copper oxides available, cupric oxide (CuO) is used widely for supercapacitor applications. [26][27][28][29][30][31] 35 Thus, different morphologies of Cu 2 O are used to fabricate the electrode, but the effects of the morphology on supercapacitor properties have not been investigated. Although the effect of morphology on supercapacitor property of the anode has been investigated using other materials, a clear relationship between the morphology and property has not been established.…”

Section: -31mentioning

confidence: 99%

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Facile synthesis of Cu₂O microstructures and their morphology dependent electrochemical supercapacitor properties

2016

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In this study, Cu 2 O microcubes and microspheres were synthesized using facile hydrothermal methods by manipulating the synthesis parameters. The Cu 2 O microcubes ($2 mm in diameter) were formed in presence of formic acid, whereas hierarchical Cu 2 O microspheres ($5 mm in diameter) were formed in acetic acid. Transmission electron microscopy (TEM) confirmed the formation of single crystalline microcubes and polycrystalline microspheres. The possible growth mechanism suggested that microcubes were formed due to the cubic crystal structure of Cu 2 O and the formation kinetics, whereas microspheres were formed due to the orientational attachment of nuclei with similar aggregation velocities along every direction. The electrochemical properties of the Cu 2 O microcubes and microspheres were investigated to understand the role of the morphology on the supercapacitor properties. The Cu 2 O microcubes exhibited a higher specific capacitance, better rate capability and cycling stability as compared to microspheres, although the particle size and pore size were larger and surface area was lower. The specific capacitance of the Cu 2 O microcubes and microspheres were 660 and 516 F g À1, respectively, at a 1 A g À1 current density. The Cu 2 O microcubes showed 80% specific capacitance retention at a 5 A g À1 current density after 1000 cycles. The single crystalline nature and the presence of a smaller number of grain boundaries in the microcubes compared to the microspheres resulted in an increase in conductivity and an increase in capacitance. The results showed that the Cu 2 O microcubes can be a promising electrode material for high performance supercapacitors.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: -31mentioning

confidence: 99%

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Facile synthesis of Cu₂O microstructures and their morphology dependent electrochemical supercapacitor properties

2016

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“…In a word, Ni foam is a good current collector in alkaline or neutral electrodes as long as we subtract the possible capacitive contribution to get corrected specific capacitances of the active material [24]. As an alternative option of Ni foam, Cu foam has been used widely because of its high resistance to acidity and negligible capacitive contribution [25,26].…”

Section: Substrates and Synthetic Methodsmentioning

confidence: 99%

Transition metal oxides/hydroxides nanoarrays for aqueous electrochemical energy storage systems

Jiang

et al. 2014

Sci. China Mater.

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The need for the development of efficient electrochemical energy storage devices with high energy density, power density and safety is becoming more and more urgent in recent years, and the key for achieving the outstanding performance is the suitable structural designing of active materials. Nanoarray architecture emerged as one of the most promising structures, as it can offer many advantages to boost the electrochemical performance. Specifically, this kind of integrated electrodes can provide a large electrochemically active surface area, faster electron transport and electrolyte ion diffusion, leading to substantially improved capacitive, rate and cycling performances. In this paper, we will review the recent advances in strategies for synthesis of materials with nanoarray architectures and their applications in supercapacitors and batteries.

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“…Copper oxide can be considered as another promising candidate for SCs because of its non-toxicity, abundance, and facile preparation [104,105]. Through a facile electrochemical process, 3D nanostructured CuO electrodes were prepared for SCs by Chen et al (Fig.…”

Section: Copper Oxidesmentioning

confidence: 99%

Hierarchically nanostructured transition metal oxides for supercapacitors

et al. 2017

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3D binder-free Cu₂O@Cu nanoneedle arrays for high-performance asymmetric supercapacitors

Cited by 184 publications

References 48 publications

Facile synthesis of Cu₂O microstructures and their morphology dependent electrochemical supercapacitor properties

Facile synthesis of Cu₂O microstructures and their morphology dependent electrochemical supercapacitor properties

Transition metal oxides/hydroxides nanoarrays for aqueous electrochemical energy storage systems

Hierarchically nanostructured transition metal oxides for supercapacitors

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3D binder-free Cu2O@Cu nanoneedle arrays for high-performance asymmetric supercapacitors

Cited by 184 publications

References 48 publications

Facile synthesis of Cu2O microstructures and their morphology dependent electrochemical supercapacitor properties

Facile synthesis of Cu2O microstructures and their morphology dependent electrochemical supercapacitor properties

Transition metal oxides/hydroxides nanoarrays for aqueous electrochemical energy storage systems

Hierarchically nanostructured transition metal oxides for supercapacitors

Contact Info

Product

Resources

About

3D binder-free Cu₂O@Cu nanoneedle arrays for high-performance asymmetric supercapacitors

Facile synthesis of Cu₂O microstructures and their morphology dependent electrochemical supercapacitor properties

Facile synthesis of Cu₂O microstructures and their morphology dependent electrochemical supercapacitor properties