Hierarchically porous CoFe2O4 nanosheets supported on Ni foam with excellent electrochemical properties for asymmetric supercapacitors

Gao, Hongyan; Xiang, Junjie; Cao, Yan

doi:10.1016/j.apsusc.2017.04.067

Cited by 111 publications

(27 citation statements)

References 41 publications

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“…A scale-up of the synthesis of good quality and homogeneous nanosheets ( Figure 2) has been developed by Chin et al [100], which consisted in the immersion of Fe substrates into a 70 • C solution of HCl and KCl under an O 2 rich environment. Strategies have also been developed for the synthesis of nanosheets based on other ferrites, mainly CoFe 2 O 4 through template assisted [101][102][103], and thermal decomposition [104]. Magnetite nanoplates synthesis have also been reported through a hydrothermal route [105,106], with a saturation magnetization above 60 emu/g.…”

Section: Nano-films Sheets and Platesmentioning

confidence: 99%

Shape Anisotropic Iron Oxide-Based Magnetic Nanoparticles: Synthesis and Biomedical Applications

Andrade

Veloso

Castanheira

2020

IJMS

130

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Research on iron oxide-based magnetic nanoparticles and their clinical use has been, so far, mainly focused on the spherical shape. However, efforts have been made to develop synthetic routes that produce different anisotropic shapes not only in magnetite nanoparticles, but also in other ferrites, as their magnetic behavior and biological activity can be improved by controlling the shape. Ferrite nanoparticles show several properties that arise from finite-size and surface effects, like high magnetization and superparamagnetism, which make them interesting for use in nanomedicine. Herein, we show recent developments on the synthesis of anisotropic ferrite nanoparticles and the importance of shape-dependent properties for biomedical applications, such as magnetic drug delivery, magnetic hyperthermia and magnetic resonance imaging. A brief discussion on toxicity of iron oxide nanoparticles is also included.

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Section: Nano-films Sheets and Platesmentioning

confidence: 99%

Shape Anisotropic Iron Oxide-Based Magnetic Nanoparticles: Synthesis and Biomedical Applications

Andrade

Veloso

Castanheira

2020

IJMS

130

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“…Cao et al. illustrated that as‐synthesized CoFe 2 O 4 nanosheets on Ni foam with specific capacity of 503 F g −1 at a current density of 2 A g −1 and high energy density of 22.85 Wh kg −1 . Meyrick et al.…”

Section: Introductionmentioning

confidence: 99%

Bifunctional Conducting Polymer Coated CoFe₂O₄ Core‐Shell Nanolayer on Carbon Fiber Cloth for 2.0 V Wearable Aqueous Supercapacitors

et al. 2019

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In recent years, a flexible supercapacitor with high storage properties, it is no longer concerned because of its low voltage window. Here, we design and synthesize CoFe 2 O 4 nanoparticles grow on Carbon Fiber Cloth (CFC) via a mild hydrothermal and spay the ultra-conductive polymer Poly (3,4-ethylenedioxythiophene):poly (styrenesulfonic acid) (PEDOT:PSS) on the surface of CoFe 2 O 4 nanolayer. The as-fabricated PEDOT:PSS /Fe 2 O 3 -CNTs /CFC and PEDOT:PSS/CoFe 2 O 4 /CFC electrodes as the negative and positive pseudocapacitor electrode show an excellent capacitance of 426 and 472.5 F g À 1 at 1 A g À 1 , respectively. An aqueous flexible asymmetric supercapacitor (AFAS) at 2.0 V and achieve well specific capacitance of 181.3 F g À 1 at a current density of 1 A g À 1 and the maximum energy density is 25.17 Wh kg À 1 at power density of 620.7 W kg À 1 . To the aqueous flexible asymmetric supercapacitor, both positive and negative electrodes are important for the electrochemical performance. The power storage capacity per unit area of two electrodes should be similar, because the area of negative and positive electrode of flexible asymmetric supercapacitor must be similarity. The advantages of AFAS, according to its low-cost, high capacitances and simple fabrication process, show that AFAS can be one of the excellent candidate flexible asymmetric supercapacitor for next-generation high-performance supercapacitors.

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“…Based on Ragone plot of the relationship between E D and P D (Figure (f)), the HSD exhibits E D of 27.08 W h/kg at P D of 750 W/kg. The achieved results is higher than the previously reported for asymmetric supercapacitors such as CoFe 2 O 4 //AC (22.85 Wh/kg), L−CoFe 2 O 4 /C//AC (14.38 14 W h/kg), and CoFe 2 O 4 //RGO (12.14 W h/kg) …”

Section: Resultsmentioning

confidence: 55%

CoFe₂O₄@Carbon Spheres Electrode: A One‐Step Solvothermal Method for Enhancing the Electrochemical Performance of Hybrid Supercapacitors

et al. 2020

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Constructing electrode materials with high energy densities are the effective way to develop asymmetric supercapacitor devices. Therefore, the inlay of conductive materials into pseudocapacitive constituents is a practical approach to increase the performance of supercapacitor electrodes. Herein, we declare a facile one-step as an economic strategy for tailoring carbon spheres (CSs) impregnated by CoFe 2 O 4 to form a CoFe 2 O 4 @CSs composite. The CoFe 2 O 4 @CSs composite was fully characterized by X-ray diffraction (XRD), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), and transmission electron microscopy (TEM), which evidenced that CoFe 2 O 4 nanoparticles were densely cored inside the carbon spheres. Moreover, the electrochemical characterization of the CoFe 2 O 4 @CSs composite was manifested high specific capacitance of (600 F/g) at a current density (1 A/g), high performance rate, and cycling stability. CoFe 2 O 4 @CSs has achieved capacitance retention of 94.1 % after 5000 charge/discharge cycles at a current density of 20 mA/g. The device-based asymmetric supercapacitors were found to improve the energy density to 27.08 Wh/kg at a power density of 750 W/kg with 99 % capacitance retention, which is higher than the values previously reported. The exceptional performance of CoFe 2 O 4 @CSs composites gives high priority for such materials in variant electrochemical fields, owing to the harmony between CoFe 2 O 4 nanoparticles and carbon spheres.[a] Dr.

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Hierarchically porous CoFe2O4 nanosheets supported on Ni foam with excellent electrochemical properties for asymmetric supercapacitors

Cited by 111 publications

References 41 publications

Shape Anisotropic Iron Oxide-Based Magnetic Nanoparticles: Synthesis and Biomedical Applications

Shape Anisotropic Iron Oxide-Based Magnetic Nanoparticles: Synthesis and Biomedical Applications

Bifunctional Conducting Polymer Coated CoFe₂O₄ Core‐Shell Nanolayer on Carbon Fiber Cloth for 2.0 V Wearable Aqueous Supercapacitors

CoFe₂O₄@Carbon Spheres Electrode: A One‐Step Solvothermal Method for Enhancing the Electrochemical Performance of Hybrid Supercapacitors

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Hierarchically porous CoFe2O4 nanosheets supported on Ni foam with excellent electrochemical properties for asymmetric supercapacitors

Cited by 111 publications

References 41 publications

Shape Anisotropic Iron Oxide-Based Magnetic Nanoparticles: Synthesis and Biomedical Applications

Shape Anisotropic Iron Oxide-Based Magnetic Nanoparticles: Synthesis and Biomedical Applications

Bifunctional Conducting Polymer Coated CoFe2O4 Core‐Shell Nanolayer on Carbon Fiber Cloth for 2.0 V Wearable Aqueous Supercapacitors

CoFe2O4@Carbon Spheres Electrode: A One‐Step Solvothermal Method for Enhancing the Electrochemical Performance of Hybrid Supercapacitors

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Product

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Bifunctional Conducting Polymer Coated CoFe₂O₄ Core‐Shell Nanolayer on Carbon Fiber Cloth for 2.0 V Wearable Aqueous Supercapacitors

CoFe₂O₄@Carbon Spheres Electrode: A One‐Step Solvothermal Method for Enhancing the Electrochemical Performance of Hybrid Supercapacitors