Performance of asymmetric supercapacitor using CoCr-layered double hydroxide and reduced graphene-oxide

Kiran, Sarigamala Karthik; Padmini, M.; Das, Himadri Tanaya; Elumalai, Perumal

doi:10.1007/s10008-016-3436-8

Cited by 40 publications

(13 citation statements)

References 34 publications

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“…The Nyquist plots consist of a small semicircle at high‐frequency region and a spike nearly 45° inclined to Y‐axis at low‐frequency region. As per the literature, the diameter of the semicircle in the high‐frequency region indicates the resistance of the electrode, while the presence spike implies characteristic of Warburg element, i. e., the diffusion controlled charge‐transfer process . It can be seen from the inset that the diameter of the graphene electrode is significantly small compared to that of the MnO 2 electrode.…”

Section: Resultsmentioning

confidence: 59%

“…From the charge/discharge profiles ((Figure .10 (d) and 9. (d)), energy density and power density of both the devices are calculated using the following formulae:

true E = C V^{2} / 2 x 3.6 normalW normalh kg^{- 1}

true P = 3600 E / t normalW kg^{- 1}

…”

Section: Resultsmentioning

confidence: 99%

“…As per the literature, the diameter of the semicircle in the high-frequency region indicates the resistance of the electrode, while the presence spike implies characteristic of Warburg element, i. e., the diffusion controlled charge-transfer process. [26][27][28] It can be seen from the inset that the diameter of the graphene electrode is significantly small compared to that of the MnO 2 electrode. Such a small diameter of the graphene electrode implies less resistance or high conductivity due to its highly conductive nature.…”

Section: Electrochemical Activities Of Graphene and Mnomentioning

confidence: 99%

“…From the charge/discharge profiles (( Figure .10 (d) and 9. (d)), energy density and power density of both the devices are calculated using the following formulae: [28] E ¼ CV 2 = 2 x 3:6 W h kg À 1 ð5Þ…”

Section: Performances Of Solid-state Symmetric and Asymmetric Supercamentioning

confidence: 99%

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Disposed Dry Cells as Sustainable Source for Generation of Few Layers of Graphene and Manganese Oxide for Solid‐State Symmetric and Asymmetric Supercapacitor Applications

2018

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Recycling electronic wastes (e‐wastes) is one of the steps to build greener and cleaner environment. In this work, re‐using of disposed dry cell (zinc‐carbon battery) components to generate graphene and manganese oxide for energy storage application has been demonstrated. The obtained materials have been characterized by X‐ray diffraction, Fourier transformed infrared spectroscopy, Raman spectroscopy and scanning electron microscope. The electrochemical performances of the generated graphene and the MnO2 have been examined in 1M H2SO4. The symmetric (MnO2|PVA:H2SO4|MnO2) and asymmetric (Graphene|PVA:H2SO4|MnO2) supercapacitors were fabricated and their performances were evaluated. The fabricated proto‐type asymmetric device delivered energy density as high as 68 W h kg‐1 at power density of 8010 W kg‐1 with a wide operating potential up to 1.6 V. The device had a long life of 5000 cycles with high Coulombic efficiency as high as 90 %. The observed such an excellent electrochemical performances are attributed to the large surface area and high conductivity of the graphene nanonetwork and nanoporous MnO2 extracted from the disposed dry cell. The two asymmetric proto‐type devices connected in series could light an LED for about 10 min in one charge.

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Section: Resultsmentioning

confidence: 59%

“…From the charge/discharge profiles ((Figure .10 (d) and 9. (d)), energy density and power density of both the devices are calculated using the following formulae:

true E = C V^{2} / 2 x 3.6 normalW normalh kg^{- 1}

true P = 3600 E / t normalW kg^{- 1}

…”

Section: Resultsmentioning

confidence: 99%

Section: Electrochemical Activities Of Graphene and Mnomentioning

confidence: 99%

Section: Performances Of Solid-state Symmetric and Asymmetric Supercamentioning

confidence: 99%

See 2 more Smart Citations

Disposed Dry Cells as Sustainable Source for Generation of Few Layers of Graphene and Manganese Oxide for Solid‐State Symmetric and Asymmetric Supercapacitor Applications

2018

Self Cite

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“…Supercapacitors bridging the energy storage gap between batteries and conventional capacitors and widely being used for hybrid electric vehicles, medical applications, military, and diesel locomotives [3,4]. However, high specific power, long cycle life time and portability of supercapacitors make it more demand than batteries [5]. The energy storage mechanism of a supercapacitor can be classified into the electrical double-layer capacitor (EDLC) and pseudocapacitors [6,7].…”

Section: Introductionmentioning

confidence: 99%

Facile Electrodeposition of Poly(3,4-ethylenedioxythiophene) on Poly(vinyl alcohol) Nanofibers as the Positive Electrode for High-Performance Asymmetric Supercapacitor

2019

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Poly(vinyl alcohol)/poly(3,4-ethylenedioxythiophene) (PVA/PEDOT) nanofibers were synthesized as a positive electrode for high-performance asymmetric supercapacitor (ASC). PVA/PEDOT nanofibers were prepared through electrospinning and electrodeposition meanwhile reduced graphene oxide (rGO) was obtained by electrochemical reduction. The PVA/PEDOT nanofibers demonstrated cauliflower-like morphology showing that PEDOT was uniformly coated on the smooth cross-linking structure of PVA nanofibers. In addition, the ASC showed a remarkable energy output efficiency by delivering specific energy of 21.45 Wh·kg−1 at a specific power of 335.50 W·kg−1 with good cyclability performance (83% capacitance retained) after 5000 CV cycles. The outstanding supercapacitive performance is contributed from the synergistic effects of both PVA/PEDOT//rGO, which gives promising materials for designing high-performance supercapacitor applications.

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Rapid Surface Reconstruction of Amorphous Co(OH)₂/WO_x with Rich Oxygen Vacancies to Promote Oxygen Evolution

Wang

et al. 2021

ChemSusChem

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Herein, a transition metal dissolution‐oxygen vacancy strategy, based on dissolution of highly oxidized transition metal species in alkaline electrolyte, was suggested to construct a high‐performance amorphous Co(OH)2/WOx (a‐CoW) catalyst for the oxygen evolution reaction (OER). The surface reconstruction of a‐CoW and its evolution were described by regulating oxygen vacancies. With continuous dissolution of W species, oxygen vacancies on the surface were generated rapidly, the surface reconstruction was promoted, and the OER performance was improved significantly. During the surface reconstruction, W species also played a role in electronic modulation for Co. Due to its rapid surface reconstruction, a‐CoW exhibited excellent OER performance in alkaline electrolyte with an overpotential of 208 mV at 10 mA cm−2 and had long‐term stability for at least 120 h. This work shows that the transition metal dissolution‐oxygen vacancy strategy is effective for preparation of high‐performance catalysts.

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Performance of asymmetric supercapacitor using CoCr-layered double hydroxide and reduced graphene-oxide

Cited by 40 publications

References 34 publications

Disposed Dry Cells as Sustainable Source for Generation of Few Layers of Graphene and Manganese Oxide for Solid‐State Symmetric and Asymmetric Supercapacitor Applications

Disposed Dry Cells as Sustainable Source for Generation of Few Layers of Graphene and Manganese Oxide for Solid‐State Symmetric and Asymmetric Supercapacitor Applications

Facile Electrodeposition of Poly(3,4-ethylenedioxythiophene) on Poly(vinyl alcohol) Nanofibers as the Positive Electrode for High-Performance Asymmetric Supercapacitor

Rapid Surface Reconstruction of Amorphous Co(OH)₂/WO_x with Rich Oxygen Vacancies to Promote Oxygen Evolution

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Performance of asymmetric supercapacitor using CoCr-layered double hydroxide and reduced graphene-oxide

Cited by 40 publications

References 34 publications

Disposed Dry Cells as Sustainable Source for Generation of Few Layers of Graphene and Manganese Oxide for Solid‐State Symmetric and Asymmetric Supercapacitor Applications

Disposed Dry Cells as Sustainable Source for Generation of Few Layers of Graphene and Manganese Oxide for Solid‐State Symmetric and Asymmetric Supercapacitor Applications

Facile Electrodeposition of Poly(3,4-ethylenedioxythiophene) on Poly(vinyl alcohol) Nanofibers as the Positive Electrode for High-Performance Asymmetric Supercapacitor

Rapid Surface Reconstruction of Amorphous Co(OH)2/WOx with Rich Oxygen Vacancies to Promote Oxygen Evolution

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Rapid Surface Reconstruction of Amorphous Co(OH)₂/WO_x with Rich Oxygen Vacancies to Promote Oxygen Evolution