Enhancing Specific Energy and Power in Asymmetric Supercapacitors - A Synergetic Strategy based on the Use of Redox Additive Electrolytes

Singh, Arvinder; Chandra, Amreesh

doi:10.1038/srep25793

Cited by 86 publications

(38 citation statements)

References 55 publications

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“…The GO content was calculated to be 3.29% based on the residual weights of the two samples at 100 °C. have high redox reactivity characteristics in the positive potential window [35,36]. Whereas, the anodic and cathodic peaks present in Ni(OH) 2 -based electrodes emanated from the oxidation and reduction reactions of Ni(OH) 2 to NiOOH, respectively as shown [4,37]: 19 The larger current density observed in the CV of the Ni(OH) 2 /GO electrode compared to that of Ni(OH) 2 , GO, and Mix-Ni(OH)2/GO electrodes in Fig.…”

Section: Structural and Morphological Propertiesmentioning

confidence: 99%

Solvothermal synthesis of surfactant free spherical nickel hydroxide/graphene oxide composite for supercapacitor application

Khaleed

Bello

Dangbegnon

et al. 2017

Journal of Alloys and Compounds

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Highlights• Use of solvothermal technique for production of nickel hydroxide/graphene oxide composite.• Spherical nickel hydroxide composed of nanosheets.• Excellent electrochemical properties of composite electrode material. AbstractSpherical composite of Ni(OH) 2 /GO was produced via a surfactant free solvothermal technique and tested as electrode materials for electrochemical capacitors. The structural and morphological analysis confirmed that deposition of Ni(OH) 2 onto GO does not change the crystal structure of pure hexagonal α-Ni(OH) 2 . Electrode fabricated from the Ni(OH) 2 /GO composite demonstrates a superior electrochemical performance when compared to that of pure Ni(OH) 2 , GO, and Mix-Ni(OH) 2 /GO electrodes with Ni(OH) 2 /GO electrode exhibiting a specific capacity of ∼420 mA h g -1 which correspond to a specific capacitance of 3619 F g -1 at 2.5 A g -1 , as well as a corresponding rate capability of 78% at 10 A g -1 . The stability study of the 2 Ni(OH) 2 /GO composite reveals a good capacity retention of ∼95% at a current density of 10 A g -1 after 3000 charge-discharge cycles.

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Section: Structural and Morphological Propertiesmentioning

confidence: 99%

Solvothermal synthesis of surfactant free spherical nickel hydroxide/graphene oxide composite for supercapacitor application

Khaleed

Bello

Dangbegnon

et al. 2017

Journal of Alloys and Compounds

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show abstract

“…In comparison, pseudo-capacitors fabricated using various metal-oxides, hydro-oxides or conducting polymers generally exhibit much higher specific capacitances than EDLCs. Knowing the fact that the pseudocapacitor’s capacitance is driven by the faradaic redox reactions at the material surface, their performance can also be increased by incorporating redox additives into the electrolyte 24 .…”

Section: Introductionmentioning

confidence: 99%

Hollow nanostructures of metal oxides as next generation electrode materials for supercapacitors

Sharma¹,

Singh²,

Chandra³

2018

Sci Rep

Self Cite

102

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Hollow nanostructures of copper oxides help to stabilize appreciably higher electrochemical characteristics than their solid counter parts of various morphologies. The specific capacitance values, calculated using cyclic voltammetry (CV) and charge-discharge (CD) studies, are found to be much higher than the values reported in literature for copper oxide particles showing intriguing morphologies or even composites with trendy systems like CNTs, rGO, graphene, etc. The proposed cost-effective synthesis route makes these materials industrially viable for application in alternative energy storage devices. The improved electrochemical response can be attributed to effective access to the higher number of redox sites that become available on the surface, as well as in the cavity of the hollow particles. The ion transport channels also facilitate efficient de-intercalation, which results in the enhancement of cyclability and Coulombic efficiency. The charge storage mechanism in copper oxide structures is also proposed in the paper.

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“…As a fair comparison, the CV curves of CTSs@CQDs at various scan rates were depicted in Figure 3(b). e specific capacitances of the electrodes can be calculated using the following equation [24][25][26][27]:…”

Section: Resultsmentioning

confidence: 99%

Stable Copper Tin Sulfide Nanoflower Modified Carbon Quantum Dots for Improved Supercapacitors

Huang

Shang

et al. 2019

Journal of Chemistry

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Copper tin sulfides (CTSs) have widely been investigated as electrode materials for supercapacitors owing to their high theoretical pseudocapacitances. However, the poor intrinsic conductivity and volume change during redox reactions hindered their electrochemical performances and broad applications. In this study, carbon quantum dots (CQDs) were employed to modify CTSs. e structures and morphologies of obtained materials were characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). XRD revealed CTSs were composed of Cu 2 SnS 3 and Cu 4 SnS 4 , and TEM suggested the decoration of CQDs on the surface of CTSs. With the decoration of CQDs, CTSs@CQDs showed a remarkable specific capacitance of 856 F·g −1 at 2 mV·s −1 and a high rate capability of 474 F·g −1 at 50 mV·s −1 , which were superior to those of CTSs (851 F·g −1 at 2 mV·s −1 and 192 F·g −1 at 50 mV·s −1 , respectively). is was mainly ascribed to incorporation of carbon quantum dots, which improved the electrical conductivity and alleviated volume change of CTSs during charge/ discharge processes.

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Enhancing Specific Energy and Power in Asymmetric Supercapacitors - A Synergetic Strategy based on the Use of Redox Additive Electrolytes

Cited by 86 publications

References 55 publications

Solvothermal synthesis of surfactant free spherical nickel hydroxide/graphene oxide composite for supercapacitor application

Solvothermal synthesis of surfactant free spherical nickel hydroxide/graphene oxide composite for supercapacitor application

Hollow nanostructures of metal oxides as next generation electrode materials for supercapacitors

Stable Copper Tin Sulfide Nanoflower Modified Carbon Quantum Dots for Improved Supercapacitors

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