Flexible asymmetric supercapacitors made of 3D porous hierarchical CuCo2O4@CQDs and Fe2O3@CQDs with enhanced performance

Wei, Guijuan; Zhao, Xixia; Du, Kun; Huang, Yiwen; An, Changhua; Qiu, Shujun; Liu, Miao; Yao, Shuang; Wu, Yue

doi:10.1016/j.electacta.2018.06.153

Cited by 49 publications

(18 citation statements)

References 51 publications

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“…The O2 peak was ascribed to the −OH group, and the O3 component indicated the physically and chemically absorbed water molecules on the surface of BMs. 18,36,45 From the above XPS analysis, it can be concluded that Cu 2+ and Co 2+ /Co 3+ exist in the molecules of CuCo 2 O 4 BMs.…”

Section: Resultsmentioning

confidence: 91%

“…The currently commercialized supercapacitors are mainly dominated by the symmetric EDLCs with energy density of about 5−10 W h kg −1 , which is far from satisfying the needs of advanced energy-storage systems with high performance. 18 To circumvent the dilemma of low energy density, researchers have developed asymmetrical supercapacitors (ASCs) or hybrid supercapacitors (HSCs) to enlarge the voltage window and increase the specific capacity, and the energy density can be improved accordingly. The ASCs cover a wide range in theory.…”

Section: Introductionmentioning

confidence: 99%

“…In the past decade, scientists and engineers have taken considerable efforts to enhance energy density, because the relatively low energy density of the supercapacitor hinders its development and further commercialization seriously. The currently commercialized supercapacitors are mainly dominated by the symmetric EDLCs with energy density of about 5–10 W h kg –1 , which is far from satisfying the needs of advanced energy-storage systems with high performance . To circumvent the dilemma of low energy density, researchers have developed asymmetrical supercapacitors (ASCs) or hybrid supercapacitors (HSCs) to enlarge the voltage window and increase the specific capacity, and the energy density can be improved accordingly.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Bundlelike CuCo₂O₄ Microstructures Assembled with Ultrathin Nanosheets As Battery-Type Electrode Materials for High-Performance Hybrid Supercapacitors

Sun

et al. 2020

ACS Appl. Energy Mater.

202

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In this work, bundlelike CuCo 2 O 4 microstructures (CuCo 2 O 4 BMs) assembled with ultrathin nanosheets were fabricated through employing an easy and scalable hydrothermal method along with an extra thermal treatment in air. These CuCo 2 O 4 BMs possessed a specific surface area as large as 114.36 m 2 g −1 and a mean pore size of 10.99 nm with pore size distribution at 1.88 nm. The electrochemical behavior was evaluated in 2 M KOH solution. It demonstrated that the CuCo 2 O 4 BMs exhibited the typical features of battery-type electrode material with a specific capacity up to 303.22 C g −1 at 1 A g −1 , a rate capability of 69.77% at 10 A g −1 , and 71.8% capacity retention after 5000 cycles at 5 A g −1 . A hybrid supercapacitor (HSC) was assembled with CuCo 2 O 4 BMs as the cathode and activated carbon as the anode, respectively. The HSC exhibited a specific capacity of 152.25 C g −1 at 1 A g −1 with 111.75% retention over 5000 cycles and delivered a remarkable energy density of 39.95 W h kg −1 at 944.63 W kg −1 and still maintained 27.06 W h kg −1 even at 8.06 kW kg −1 . By virtue of these impressive electrochemical performances, the CuCo 2 O 4 BMs can serve as a promising battery-type electrode material toward high-performance hybrid supercapacitors and other energy-storage systems.

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Section: Resultsmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Bundlelike CuCo₂O₄ Microstructures Assembled with Ultrathin Nanosheets As Battery-Type Electrode Materials for High-Performance Hybrid Supercapacitors

Sun

et al. 2020

ACS Appl. Energy Mater.

202

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“…The C-QD matrix in composites allows some other material combination also to have good flexibility. Recently, several composites of C-QD materials have demonstrated outstanding flexibility with excellent bending capabilities of more than 90° but without changing the electrochemical performance after bending [ 151 , 153 ]. Testing the durability of the electrochemical properties of SCs while changing the bending angle is a crucial test to prove the wearability of C-QD SCs.…”

Section: Challenges and Future Perspectivesmentioning

confidence: 99%

Carbon-Based Quantum Dots for Supercapacitors: Recent Advances and Future Challenges

et al. 2021

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Carbon-based Quantum dots (C-QDs) are carbon-based materials that experience the quantum confinement effect, which results in superior optoelectronic properties. In recent years, C-QDs have attracted attention significantly and have shown great application potential as a high-performance supercapacitor device. C-QDs (either as a bare electrode or composite) give a new way to boost supercapacitor performances in higher specific capacitance, high energy density, and good durability. This review comprehensively summarizes the up-to-date progress in C-QD applications either in a bare condition or as a composite with other materials for supercapacitors. The current state of the three distinct C-QD families used for supercapacitors including carbon quantum dots, carbon dots, and graphene quantum dots is highlighted. Two main properties of C-QDs (structural and electrical properties) are presented and analyzed, with a focus on the contribution to supercapacitor performances. Finally, we discuss and outline the remaining major challenges and future perspectives for this growing field with the hope of stimulating further research progress.

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“…Glucose as a structure-directing agent can promote the formation of V 2 O 5 nanobelt. [16] As analyzed from the high-resolution (HR)TEM image (Figure 1e), the distinct lattice fringe with a d-spacing of 0.57 nm corresponds to the (200) plane of orthorhombic V 2 O 5 . The CQDs in approximately 3 nm are well dispersed in the V 2 O 5 framework.…”

Section: Resultsmentioning

confidence: 99%

Carbon Quantum Dots Promote Coupled Valence Engineering of V₂O₅ Nanobelts for High‐Performance Aqueous Zinc‐Ion Batteries

et al. 2021

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Aqueous Zn-ion batteries (ZIBs) have acquired the researchers' curiosity owing to their harmlessness, cost effectiveness and high theoretical capacity of Zn anode. However, desirable cathode materials with high-capacity and high-rate are still scarce. In this work, the formation of carbon quantum dots induced vanadium pentoxide nanobelts was demonstrated via a facile one-step hydrothermal method for ZIBs. It exhibited an excellent Zn ion storage capacity of 460 mA h g À 1 at 0.1 A g À 1 , superior rate capability and stable cycling performance (above 85 % capacity retention over 1500 cycles at 4 A g À 1 ). The electrochemical kinetics and zinc ion storage mechanism were also considered. An efficient architecture-coupled valence engineering in the hybrid cathode was proposed to improve the electric conductivity, Zn ion diffusion rate, and cycling stability for ZIBs. This work may be a great motivation for further research on V 2 O 5 or other vanadium-based materials for high-performance ZIBs.

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Flexible asymmetric supercapacitors made of 3D porous hierarchical CuCo2O4@CQDs and Fe2O3@CQDs with enhanced performance

Cited by 49 publications

References 51 publications

Bundlelike CuCo₂O₄ Microstructures Assembled with Ultrathin Nanosheets As Battery-Type Electrode Materials for High-Performance Hybrid Supercapacitors

Bundlelike CuCo₂O₄ Microstructures Assembled with Ultrathin Nanosheets As Battery-Type Electrode Materials for High-Performance Hybrid Supercapacitors

Carbon-Based Quantum Dots for Supercapacitors: Recent Advances and Future Challenges

Carbon Quantum Dots Promote Coupled Valence Engineering of V₂O₅ Nanobelts for High‐Performance Aqueous Zinc‐Ion Batteries

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Flexible asymmetric supercapacitors made of 3D porous hierarchical CuCo2O4@CQDs and Fe2O3@CQDs with enhanced performance

Cited by 49 publications

References 51 publications

Bundlelike CuCo2O4 Microstructures Assembled with Ultrathin Nanosheets As Battery-Type Electrode Materials for High-Performance Hybrid Supercapacitors

Bundlelike CuCo2O4 Microstructures Assembled with Ultrathin Nanosheets As Battery-Type Electrode Materials for High-Performance Hybrid Supercapacitors

Carbon-Based Quantum Dots for Supercapacitors: Recent Advances and Future Challenges

Carbon Quantum Dots Promote Coupled Valence Engineering of V2O5 Nanobelts for High‐Performance Aqueous Zinc‐Ion Batteries

Contact Info

Product

Resources

About

Bundlelike CuCo₂O₄ Microstructures Assembled with Ultrathin Nanosheets As Battery-Type Electrode Materials for High-Performance Hybrid Supercapacitors

Bundlelike CuCo₂O₄ Microstructures Assembled with Ultrathin Nanosheets As Battery-Type Electrode Materials for High-Performance Hybrid Supercapacitors

Carbon Quantum Dots Promote Coupled Valence Engineering of V₂O₅ Nanobelts for High‐Performance Aqueous Zinc‐Ion Batteries