Designing graphene-wrapped nanoporous CuCo<sub>2</sub>O<sub>4</sub> hollow spheres electrodes for high-performance asymmetric supercapacitors

Kaverlavani, Saeid Kamari; Moosavifard, Seyyed Ebrahim; Bakouei, Ali

doi:10.1039/c7ta03943c

Cited by 176 publications

(74 citation statements)

References 67 publications

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“…As the scan rate increased, the redox peak appeared to shift due to the presence of polarization (Ratha et al, 2017). The possible electrochemical reaction equations are as follows (Kaverlavani et al, 2017;Zhu et al, 2017):…”

Section: Resultsmentioning

confidence: 99%

Freestanding Needle Flower Structure CuCo2S4 on Carbon Cloth for Flexible High Energy Supercapacitors With the Gel Electrolyte

Xie

Wang

et al. 2020

Front. Chem.

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A facile hydrothermal approach was adopted to the direct synthesis of bimetallic sulfide (CuCo 2 S 4 ) on carbon cloth (CC) without binders for the supercapacitor's electrodes. A possible formation mechanism was proposed. The prepared bimetallic electrode exhibited a high specific capacitance (Csp) of 1,312 F·g −1 at 1 A·g −1 , and an excellent capacitance retention of 94% at 5 A·g −1 over 5,000 cycles. In addition, the asymmetric supercapacitor (CuCo 2 S 4 /CC//AC/CC) exhibited energy density (42.9 wh·kg −1 at 0.8 kW·kg −1 ) and outstanding cycle performance (80% initial capacity retention after 5,000 cycles at 10 A·g −1 ). It should be noted that the electrochemical performance of a supercapacitor device is quite stable at different bending angles. Two charged devices in series can light 28 red-colored LEDs (2.0 V) for 5 min. All of this serves to indicate the potentially high application value of CuCo 2 S 4 .

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Section: Resultsmentioning

confidence: 99%

Freestanding Needle Flower Structure CuCo2S4 on Carbon Cloth for Flexible High Energy Supercapacitors With the Gel Electrolyte

Xie

Wang

et al. 2020

Front. Chem.

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“…In the initial hydrothermal process, a spherical CoFe-glycerate precursor was produced via the reaction of Co 2 + , Fe 3 + and glycerol under the medium of isopropanol. The CoFeÀ glycerate precursor could be used as a selftemplate [28,29] and nanoporous CoFe 2 O 4 hollow spheres were obtained upon a subsequent annealing (350°C for 2 h, N 2 flow). During the annealing process, organic components in the CoFeglycerate was burnt out, leading to a unique spherical structure that consists of a hollow interior and a porous surface.…”

Section: Resultsmentioning

confidence: 99%

Three‐Dimensional Porous CoFe₂O₄/Graphene Composite for Highly Stable Sodium‐Ion Batteries

2019

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Sodium-ion batteries (SIBs) are promising alternatives to lithium-ion batteries (LIBs), because of the low cost and great potential in large-scale energy storage. Herein, we present a simple two-step hydrothermal route to construct a novel CoFe 2 O 4 /graphene composite. The composite is composed of nanoporous CoFe 2 O 4 hollow spheres that are well-anchored onto nitrogen-doped graphene sheets (CoFe 2 O 4 @3D-NG) with a unique 3D network structure, which can not only offer short pathways for Na + diffusion and conductive networks for electron transport, but also render sufficient active sites for Na + interfacial reaction and rigid structural stability for volume expansion. When used as an anode material for SIBs, the CoFe 2 O 4 @3D-NG electrode delivers an impressively high performance of Na storage, which includes a large initial discharge capacity of 596 mAh g À 1 at 50 mA g À 1 , a high rate capability of 79 mAh g À 1 at 1000 mA g À 1 , and a long cyclability of 118 mAh g À 1 after 1200 cycles at 500 mA g À 1 . This work indicates a promising way to design and fabricate advanced CoFe 2 O 4based anode materials for high-performance Na-storage.[a] Dr.

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“…As typical electrode materials of supercapacitors, cobalt‐based metal oxides (e. g. NiCo 2 O 4 , ZnCo 2 O 4 , CoMoO 4 , Co 3 O 4 , CuCo 2 O 4 , etc.) are extensively investigated as electrode materials in recent years owing to their ultrahigh capacitance, excellent cycling stability as well as simple preparation process.…”

Section: Introductionmentioning

confidence: 99%

“…[2] However, supercapacitors usually suffer from relatively low energy density as compared to other rechargeable energy storage devices such as lithium-ion batteries, so the practical applications of supercapacitors are still largely hampered. [3] As typical electrode materials of supercapacitors, cobaltbased metal oxides (e. g. NiCo 2 O 4 , [4] ZnCo 2 O 4 , [5] CoMoO 4 , [6] Co 3 O 4 , [7] CuCo 2 O 4 , [8] etc.) are extensively investigated as electrode materials in recent years owing to their ultrahigh capacitance, excellent cycling stability as well as simple preparation process.…”

Section: Introductionmentioning

confidence: 99%

A Novel CVD Growth of g‐C₃N₄ Ultrathin Film on NiCo₂O₄ Nanoneedles/Carbon Cloth as Integrated Electrodes for Supercapacitors

et al. 2018

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Although g‐C3N4 possesses many features such as a graphene‐like 2D π‐conjugated planar layered structure, high nitrogen content, excellent mechanical strength and flexibility, as well as high thermal and chemical stability, there are only a few studies on the exploration of g‐C3N4 as active materials for supercapacitors. This could be largely attributed to the fact that the above advantages of g‐C3N4 to hybrid with other materials are still not fully established. Herein, we successfully develop a facile low‐temperature CVD method to grow g‐C3N4 ultrathin films with several nanometers thickness on the surface of NiCo2O4 nanoneedles. Subsequently, a NiCo2O4 nanoneedles@g‐C3N4 ultrathin film core‐shell nanostructures/carbon cloth (NiCo2O4 NNs@g‐C3N4/CC) integrated electrode was obtained. Thanks to the ultrathin film, a core‐shell nanostructure, as well as intrinsic features of g‐C3N4, the as‐obtained integrated electrode displays excellent electrochemical performance, exhibiting an areal capacitance of 2.83 F cm−2 as well as high cycling stability (5.88 % loss after 10 000 cycles). Our results clearly demonstrate that the g‐C3N4 ultrathin film obtained through this facile CVD method developed has potential in hybridizing with other transition metal oxides as electrode materials for supercapacitors and, more importantly, this convenient synthesis method may also be widely used for other applications such as designing new heterojunction photocatalysts.

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Designing graphene-wrapped nanoporous CuCo₂O₄ hollow spheres electrodes for high-performance asymmetric supercapacitors

Abstract: Increasing demand for green energy storage systems, arising from the rapid development of portable electronics, has triggered tremendous research efforts for designing new or high-performance electrodes.

Cited by 176 publications

References 67 publications

Freestanding Needle Flower Structure CuCo2S4 on Carbon Cloth for Flexible High Energy Supercapacitors With the Gel Electrolyte

Freestanding Needle Flower Structure CuCo2S4 on Carbon Cloth for Flexible High Energy Supercapacitors With the Gel Electrolyte

Three‐Dimensional Porous CoFe₂O₄/Graphene Composite for Highly Stable Sodium‐Ion Batteries

A Novel CVD Growth of g‐C₃N₄ Ultrathin Film on NiCo₂O₄ Nanoneedles/Carbon Cloth as Integrated Electrodes for Supercapacitors

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Designing graphene-wrapped nanoporous CuCo2O4 hollow spheres electrodes for high-performance asymmetric supercapacitors

Abstract: Increasing demand for green energy storage systems, arising from the rapid development of portable electronics, has triggered tremendous research efforts for designing new or high-performance electrodes.

Cited by 176 publications

References 67 publications

Freestanding Needle Flower Structure CuCo2S4 on Carbon Cloth for Flexible High Energy Supercapacitors With the Gel Electrolyte

Freestanding Needle Flower Structure CuCo2S4 on Carbon Cloth for Flexible High Energy Supercapacitors With the Gel Electrolyte

Three‐Dimensional Porous CoFe2O4/Graphene Composite for Highly Stable Sodium‐Ion Batteries

A Novel CVD Growth of g‐C3N4 Ultrathin Film on NiCo2O4 Nanoneedles/Carbon Cloth as Integrated Electrodes for Supercapacitors

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Resources

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Designing graphene-wrapped nanoporous CuCo₂O₄ hollow spheres electrodes for high-performance asymmetric supercapacitors

Three‐Dimensional Porous CoFe₂O₄/Graphene Composite for Highly Stable Sodium‐Ion Batteries

A Novel CVD Growth of g‐C₃N₄ Ultrathin Film on NiCo₂O₄ Nanoneedles/Carbon Cloth as Integrated Electrodes for Supercapacitors