Eco-friendly, one-step synthesis of cobalt sulfide-decorated functionalized graphene for high-performance supercapacitors

El-Gendy, Dalia M.; Afifi, Israa M.; Allam, Nageh K.

doi:10.1016/j.est.2019.100760

Cited by 32 publications

(14 citation statements)

References 44 publications

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“…Moreover, the shape of the CVs does not change at various scan rates, indicating excellent electrochemical reversibility and good rate capability. To help determine the charge storage mechanism and contribution of the MnO/Mn 0.56 V 0.42 O@C electrodes, the specific capacitance of the electrode at different scan rates was calculated from the CV plots using eq − as depicted in Figure b. where C s is the specific capacitance, v is the potential scan rate, I is the response current density, m is the mass of electrode material, and Δ V is the potential window. The fabricated MnO/Mn 0.56 V 0.42 O@C electrodes revealed a specific capacitance of 756.9 F g –1 at 5 mV s –1 and dropped to 243.52 F g –1 at 50 mV s –1 .…”

Section: Resultsmentioning

confidence: 99%

Electrospun Mesoporous Mn–V–O@C Nanofibers for High-Performance Asymmetric Supercapacitor Devices with High Stability

Samir

Ahmed

Ramadan

et al. 2019

ACS Sustainable Chem. Eng.

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Supercapacitors (SCs) are being considered the next-generation power storage devices due to the many favorable properties. In this regard, mesoporous nanostructures are excellent supercapacitor electrodes as they enjoy a large number of active sites and high surface area promising the utilization of the full capacitance of the active materials. In this study, we report on the assembly of electrospun, binder-free mesoporous Mn 0.56 V 0.42 O@C fibrous electrodes. The morphological and structural analyses of the fabricated Mn 0.56 V 0.42 O@C electrodes were investigated using field emission scanning electron microscopy (FESEM), high-resolution transmission electron microscopy (HRTEM), and glancing angle X-ray diffraction (GAXRD). The X-ray photoelectron spectroscopy (XPS) and GAXRD confirm the formation of Mn 0.56 V 0.42 O nanofibers and their successful bonding to carbon during crystal growth. Those fibrous composite electrodes showed excellent specific capacitance of 668.5 F g −1 at 1 A g −1 . The highly obtained capacitance is attributed to the multiple oxidation states of the Mn−V oxides, the binder-free electrodes, surface roughness, and the mesoporous nature of the fabricated nanofibers. The asymmetric supercapacitor composed of the mesoporous Mn 0.56 V 0.42 O@C nanofibers as the positive electrode and graphene hydrogel as the negative electrode possesses ultrahigh energy density of 37.77 W h kg −1 and a power density of 900 W kg −1 with superior Coulombic efficiency over 13 000 charge−discharge cycles.

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Section: Resultsmentioning

confidence: 99%

Electrospun Mesoporous Mn–V–O@C Nanofibers for High-Performance Asymmetric Supercapacitor Devices with High Stability

Samir

Ahmed

Ramadan

et al. 2019

ACS Sustainable Chem. Eng.

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“…The asymmetric device was balanced according to eq : where C CCCD + and C CCCD – were estimated from the CCCD curves of the separate positive and negative electrodes, and Δ V + and Δ V – are the potential windows of the positive and negative electrodes, respectively. The power and energy densities of the device were acquired from eqs and , respectively. where V and Δ t refer to the potential window and the discharge time (s), respectively.…”

Section: Methodsmentioning

confidence: 99%

“…were estimated from the CCCD curves of the separate positive and negative electrodes, and ΔV + and ΔV − are the potential windows of the positive and negative electrodes, respectively. The power and energy densities of the device were acquired from eqs 7 and 8, 33 respectively.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

Highly Stable Supercapacitor Devices Based on Three-Dimensional Bioderived Carbon Encapsulated g-C₃N₄ Nanosheets

Taha

Ghanem

Hamza

et al. 2021

ACS Appl. Energy Mater.

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Owing to the increasing demand for sustainable and ecofriendly energy storage devices such as supercapacitors, it is vital to continuously search for highly stable and cost-effective electrode materials with high energy and power densities. Herein, a 3D/2D metal-free mesoporous composite of graphitic carbon nitride (GCN) and bioderived carbon (Bio-C x ) is investigated as an energy storage electrode material. This composite overcomes the low conductivity and low capacitance limitations of GCN while enjoying its high corrosion resistance, high nitrogen content, and unique 2D structure. The GCN/Bio-C x composite exhibits a fairly wide operating potential window of 1.2 V in 0.5 M H 2 SO 4 aqueous electrolyte with a high capacitance of 300 F/g at 1 A/g. This high performance was ascribed to the huge number of available active sites, large surface area, and the unique 3D/2D structure. The assembled device employing the GCN/ Bio-C x composite as the positive electrode and mesoporous nitrogen-doped carbon (MPNDC) as the negative electrode showed an ultrahigh-energy density of 53.72 Wh/kg and a power density of 900 W/kg. The GCN/Bio-C x //MPNDC device retains ∼100% of its initial capacitance after 13 000 charge/discharge cycles with 100% Columbic efficiency.

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“…3e. The Nyquist plot shows a small semicircle and a linear line at high and low frequency, respectively ascribed to charge transfer/equivalent series resistances and diffusion resistance, respectively 35,36 . Using Z-fit software, the equivalent circuit was obtained as shown in Fig.…”

Section: Articlementioning

confidence: 99%

A mesoporous ternary transition metal oxide nanoparticle composite for high-performance asymmetric supercapacitor devices with high specific energy

2022

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Eco-friendly, one-step synthesis of cobalt sulfide-decorated functionalized graphene for high-performance supercapacitors

Cited by 32 publications

References 44 publications

Electrospun Mesoporous Mn–V–O@C Nanofibers for High-Performance Asymmetric Supercapacitor Devices with High Stability

Electrospun Mesoporous Mn–V–O@C Nanofibers for High-Performance Asymmetric Supercapacitor Devices with High Stability

Highly Stable Supercapacitor Devices Based on Three-Dimensional Bioderived Carbon Encapsulated g-C₃N₄ Nanosheets

A mesoporous ternary transition metal oxide nanoparticle composite for high-performance asymmetric supercapacitor devices with high specific energy

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Eco-friendly, one-step synthesis of cobalt sulfide-decorated functionalized graphene for high-performance supercapacitors

Cited by 32 publications

References 44 publications

Electrospun Mesoporous Mn–V–O@C Nanofibers for High-Performance Asymmetric Supercapacitor Devices with High Stability

Electrospun Mesoporous Mn–V–O@C Nanofibers for High-Performance Asymmetric Supercapacitor Devices with High Stability

Highly Stable Supercapacitor Devices Based on Three-Dimensional Bioderived Carbon Encapsulated g-C3N4 Nanosheets

A mesoporous ternary transition metal oxide nanoparticle composite for high-performance asymmetric supercapacitor devices with high specific energy

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Highly Stable Supercapacitor Devices Based on Three-Dimensional Bioderived Carbon Encapsulated g-C₃N₄ Nanosheets