Asymmetric supercapacitors based on 3D graphene-wrapped V2O5 nanospheres and Fe3O4@3D graphene electrodes with high power and energy densities

Ghaly, H.A.; El‐Deen, Ahmed G.; Souaya, Eglal R.; Allam, Nageh K.

doi:10.1016/j.electacta.2019.04.071

Cited by 122 publications

(41 citation statements)

References 69 publications

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“…All CVs showed a quasi-rectangular shape, indicating pseudocapacitive performance. The GCDs in Figure 5b,c shows a semirectangular shape as well proving the pseudocapacitive behavior [15,55,56] The estimated capacitance from the CV graph is 1.14 mF/cm 2 at 5 mV/s with an excellent rate capability up to 50 mV/s as illustrated in Figure 5d, revealing the stability of the material as it retained more than 90% of its capacitance at 50 mV/s. The electrochemical stability of the H 2 -annealed TiÀ MoÀ NiÀ O nanotubes electrode was further examined by conducting long run charge-discharge cycles (about 3700 cycles) at a charge discharge current density of 1 mA/cm 2 as illustrated in Figure 5e.…”

Section: Resultsmentioning

confidence: 67%

“…[13,14] To this end, transition metal oxides (TMOs) with multiple oxidation states, nonetheless, are well-established pseudocapacitive materials with very high theoretical specific capacitance. [15] TMOs charge/discharge by one or both of the two faradaic mechanisms, i. e. cation adsorption/desorption and intercalation/deintercalation accompanied with reversible redox reactions of metal ions near or at the electrolyte/electrode. Ruthenium oxide showed the best performance among all tested TMOs so far due to its highly reversible redox reactions, good thermal stability, wide potential window, metallic-type conductivity, and long cycle life.…”

Section: Introductionmentioning

confidence: 99%

“…To this end, transition metal oxides (TMOs) with multiple oxidation states, nonetheless, are well‐established pseudocapacitive materials with very high theoretical specific capacitance . TMOs charge/discharge by one or both of the two faradaic mechanisms, i. e. cation adsorption/desorption and intercalation/deintercalation accompanied with reversible redox reactions of metal ions near or at the electrolyte/electrode.…”

Section: Introductionmentioning

confidence: 99%

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Oxygen Vacancy‐Engineered Ti−Mo−Ni Ternary Oxide Nanotubes as Binder‐Free Supercapacitor Electrodes with Exceptional Potential Window

2020

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The charge storage performance of metal oxides as electrochemical supercapacitor electrodes is limited by their poor conductivity and limited operating potential window. Herein, we report on the oxygen-vacancy engineering of TiÀ MoÀ NiÀ O nanotubes via hydrogen annealing to boost their capacitive performance. Hydrogen treatment of the nanotubes resulted in 110% increase in specific capacitance as compared to the air-annealed counterpart with excellent stability over 3700 cycles and an exceptional capacitance retention of 99%. The observed enhancement can be ascribed to the faradaic capacitance contribution from the several redox pairs of Nickel, Molybdenum, and Ti 3 +. This was further confirmed via the electrochemical impedance spectroscopy measurements, revealing a drastic decrease in the internal resistance upon hydrogen treatment. We hope our demonstrated two-step interfacial engineering opens a new strategy to design high performance electrode materials for advanced electrochemical supercapacitors.

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Section: Resultsmentioning

confidence: 67%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Oxygen Vacancy‐Engineered Ti−Mo−Ni Ternary Oxide Nanotubes as Binder‐Free Supercapacitor Electrodes with Exceptional Potential Window

2020

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“…where ΔE is the potential window, Cs is the specific capacitance, and m is the mass of the electrode. Since the positive and negative potential windows are usually identified from the CV scans of the electrodes, the masses can be easily established . The typical mass loading of the asymmetric supercapacitor was 3.2 mg/cm 2 .…”

Section: Resultsmentioning

confidence: 99%

“…Since the positive and negative potential windows are usually identified from the CV scans of the electrodes, the masses can be easily established. [39] The typical mass loading of the asymmetric supercapacitor was 3.2 mg/cm 2 . The capacitance performance of the device can be demonstrated through the CVs at different scan rates (5,10,20,30,40, and 50 mV s À 1 ) as shown in Figure 4b, c. The device shows perfect electrochemical stability within the potential window 0-1.5 V. Moreover, the quasi-rectangular CV shape reveals a prominent faradic/capacitive behavior of the system.…”

Section: Resultsmentioning

confidence: 99%

Recycling of Li−Ni−Mn−Co Hydroxide from Spent Batteries to Produce High‐Performance Supercapacitors with Exceptional Stability

et al. 2020

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The intensive implementation of Li‐ion batteries in many markets makes it increasingly urgent to address the recycling of strategic materials from spent batteries. Batteries typically contain toxic chemicals and cannot be disposed of at will. In this study, Li−Ni−Mn−Co hydroxides are successfully recycled from spent Li‐ion batteries electrodeposited on nickel foam, and fully characterized using different techniques such as field emission scanning electron microscopy (FESEM), X‐ray diffraction (XRD), energy dispersive X‐ray spectroscopy (EDXS), inductively coupled plasma (ICP), and X‐ray photoelectron spectroscopy (XPS) techniques. The recycled nanostructured films are tested in a three‐electrode electrochemical system to investigate their capacitance behavior. The recycled electrodes show high capacitance of 951 F g−1 (specific capacity of 523.5 C g−1) at 1 A g−1. Moreover, the recycled materials are used as positive electrodes to construct asymmetric supercapacitor devices. The device shows a coulombic efficiency of 100 %, a capacitance retention reaching approximately 90 % with excellent cycling stability after 10 000 cycles as well as reasonable power and energy densities.

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High‐Performance Ytterbium‐Doped V₂O₅ ⋅ H₂O Binder‐Free Thin‐Film Electrodes for Supercapacitors

Yang

Cen

et al. 2021

ChemElectroChem

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In this work, honeycomb-like Yb-doped V 2 O 5 • nH 2 O binder-free thin film electrodes are synthesized via a simple and convenient sol-gel method. Benefiting from the synergy of V 2 O 5 • nH 2 O and rare-earth metal ion Yb 3 + , thin-layer honeycomb-like morphology formed upon the introduction of Yb 3 + into the V 2 O 5 • nH 2 O, which markedly promotes the electrochemical performance of the V 2 O 5 • H 2 O thin-film electrode. After the condition optimization, 8 % YbÀ V 2 O 5 • H 2 O exhibits superior electrochemical performance with a specific capacitance of 703 F g À 1 (at 1 A g À 1 )and outstanding cycling stability. Besides, owing to the ultrahigh conductivity of oxide super-P (OSP) nanoparticles, the V 2 O 5 • H 2 O@OSP-4 binder-free film electrode shows a high specific capacitance of 627 F g À 1 , which was prepared by the same simple sol-gel strategy. The assembled 8 % YbÀ V 2 O 5 • nH 2 O//V 2 O 5 • nH 2 O@OSP-4 device delivers a high specific energy density and excellent cycling stability. This study may have certain inspirations for the fabrication of thin-film electrodes for high-efficiency energy storage systems.

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Asymmetric supercapacitors based on 3D graphene-wrapped V2O5 nanospheres and Fe3O4@3D graphene electrodes with high power and energy densities

Cited by 122 publications

References 69 publications

Oxygen Vacancy‐Engineered Ti−Mo−Ni Ternary Oxide Nanotubes as Binder‐Free Supercapacitor Electrodes with Exceptional Potential Window

Oxygen Vacancy‐Engineered Ti−Mo−Ni Ternary Oxide Nanotubes as Binder‐Free Supercapacitor Electrodes with Exceptional Potential Window

Recycling of Li−Ni−Mn−Co Hydroxide from Spent Batteries to Produce High‐Performance Supercapacitors with Exceptional Stability

High‐Performance Ytterbium‐Doped V₂O₅ ⋅ H₂O Binder‐Free Thin‐Film Electrodes for Supercapacitors

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Asymmetric supercapacitors based on 3D graphene-wrapped V2O5 nanospheres and Fe3O4@3D graphene electrodes with high power and energy densities

Cited by 122 publications

References 69 publications

Oxygen Vacancy‐Engineered Ti−Mo−Ni Ternary Oxide Nanotubes as Binder‐Free Supercapacitor Electrodes with Exceptional Potential Window

Oxygen Vacancy‐Engineered Ti−Mo−Ni Ternary Oxide Nanotubes as Binder‐Free Supercapacitor Electrodes with Exceptional Potential Window

Recycling of Li−Ni−Mn−Co Hydroxide from Spent Batteries to Produce High‐Performance Supercapacitors with Exceptional Stability

High‐Performance Ytterbium‐Doped V2O5 ⋅ H2O Binder‐Free Thin‐Film Electrodes for Supercapacitors

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Product

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High‐Performance Ytterbium‐Doped V₂O₅ ⋅ H₂O Binder‐Free Thin‐Film Electrodes for Supercapacitors