An excellent cycle performance of asymmetric supercapacitor based on bristles like α-MnO2 nanoparticles grown on multiwalled carbon nanotubes

Vinny, R.T.; Chaitra, K.; Venkatesh, Krishna; Nagaraju, N.; Nagaraju, Kathyayini

doi:10.1016/j.jpowsour.2016.01.098

Cited by 73 publications

(45 citation statements)

References 51 publications

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“…More importantly, the obtained value of specific capacitance for CM10 thin film in KFCN:Na 2 SO 4 electrolyte is much higher than the previous report (see S. I. S6) and that proves the potential of the present work for developing the higher energy storage devices293031323334. Figure 9(i) compares the cycling stability of the CM10 thin film in Na 2 SO 4 and KFCN:Na 2 SO 4 electrolyte.…”

Section: Resultssupporting

confidence: 55%

An innovative concept of use of redox-active electrolyte in asymmetric capacitor based on MWCNTs/MnO2 and Fe2O3 thin films

Chodankar

Dubal

Lokhande

et al. 2016

Sci Rep

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In present investigation, we have prepared a nanocomposites of highly porous MnO2 spongy balls and multi-walled carbon nanotubes (MWCNTs) in thin film form and tested in novel redox-active electrolyte (K3[Fe(CN)6] doped aqueous Na2SO4) for supercapacitor application. Briefly, MWCNTs were deposited on stainless steel substrate by “dip and dry” method followed by electrodeposition of MnO2 spongy balls. Further, the supercapacitive properties of these hybrid thin films were evaluated in hybrid electrolyte ((K3[Fe(CN)6 doped aqueous Na2SO4). Thus, this is the first proof-of-design where redox-active electrolyte is applied to MWCNTs/MnO2 hybrid thin films. Impressively, the MWCNTs/MnO2 hybrid film showed a significant improvement in electrochemical performance with maximum specific capacitance of 1012 Fg−1 at 2 mA cm−2 current density in redox-active electrolyte, which is 1.5-fold higher than that of conventional electrolyte (Na2SO4). Further, asymmetric capacitor based on MWCNTs/MnO2 hybrid film as positive and Fe2O3 thin film as negative electrode was fabricated and tested in redox-active electrolytes. Strikingly, MWCNTs/MnO2//Fe2O3 asymmetric cell showed an excellent supercapacitive performance with maximum specific capacitance of 226 Fg−1 and specific energy of 54.39 Wh kg−1 at specific power of 667 Wkg−1. Strikingly, actual practical demonstration shows lightning of 567 red LEDs suggesting “ready-to sell” product for industries.

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Section: Resultssupporting

confidence: 55%

An innovative concept of use of redox-active electrolyte in asymmetric capacitor based on MWCNTs/MnO2 and Fe2O3 thin films

Chodankar

Dubal

Lokhande

et al. 2016

Sci Rep

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“…38 In this case, the neutral aqueous electrolytes, such as Li2SO4, Na2SO4, K2SO4, and KCl solutions, are widely used in the MnO2 based supercapacitor and electrode materials studies. [41][42][43][44] It has been found that the supercapacitor using a K2SO4 electrolyte can exhibit a specific energy value of 17.6 Wh kg ─1 at a specific power of 2 kW kg ─1 , which is higher than the similarly designed supercapacitor using a Li2SO4 electrolyte. 43 As to the cycling performance, it was recently reported that an asymmetrical supercapacitor consisting of α-MnO2/CNT as positrode and activated carbon as negatrode with Na2SO4 aqueous electrolyte can retain 77 % of its initial capacity after 20,000 charge-discharge cycles at 50 A g ─1 .…”

Section: Aqueous Supercapacitors and Supercapatteriesmentioning

confidence: 99%

“…43 As to the cycling performance, it was recently reported that an asymmetrical supercapacitor consisting of α-MnO2/CNT as positrode and activated carbon as negatrode with Na2SO4 aqueous electrolyte can retain 77 % of its initial capacity after 20,000 charge-discharge cycles at 50 A g ─1 . 42 Another factor affecting the performance of supercapacitor and supercapattery is the size of the hydrated ionic sphere (anion and cation). Regardless of what solutes are in the aqueous electrolytes, the real charge carriers are the hydrated ions, instead of the ions themselves.…”

Section: Aqueous Supercapacitors and Supercapatteriesmentioning

confidence: 99%

Electrolytes for electrochemical energy storage

Xia

et al. 2017

Mater. Chem. Front.

225

116

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A note on versions:The version presented here may differ from the published version or from the version of record. If you wish to cite this item you are advised to consult the publisher's version. Please see the repository url above for details on accessing the published version and note that access may require a subscription.For more information, please contact eprints@nottingham.ac.uk Journal NameThis journal is © The Royal Society of Chemistry 20xxJ. Name., 2013, 00, 1-3 | 1 Electrolyte is a key component of electrochemical energy storage (EES) devices and its properties greatly affect the energy capacity, rate performance, cyclability and safety of all EES devices. This article offers a critical review of recent progresses and challenges in electrolyte research and development particularly for supercapacitors and supercapatteries, recharegable batteries (such as lithium-ion and sodium-ion batteries), and redox flow batteries (including fuel cells in a broad sense). The review will focus on liquid electrolytes, particularly aqueous and organic electrolytes, ionic liquids and molten salts. Influences of electrolyte properties on the performances of different EES devices are discussed in detail.

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“…On the basis of EIS data, the relational graph of phase and frequency is plotted in Figure E. Good capacitive behaviour can be further explained by the phase angle of −68° at 1 Hz of MnO 2 /CNT …”

Section: Resultsmentioning

confidence: 97%

“…The Nyquist plot consisted of a semicircle, which radius represents the charge transfer resistance (Rct) due to the Faraday reaction, and a straight line in low frequency region accounts for ideal capacitive behaviour . In the enlarged figure, the intercept between the semicircle and x ‐axis shows the solution resistance (Rs) . Impedance spectrum was measured on the grounds of the equivalent circuit shown in Figure D to determine the resistance and capacitance of the electrode.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and characterisation of amorphous MnO ₂ /CNT via solid‐state microwave for high‐performance supercapacitors

et al. 2020

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Summary Amorphous MnO2 was attached to carbon nanotubes (CNTs) in 60 seconds by solid‐state microwave method. As electrodes in supercapacitors, the coactions of the MnO2 and CNT augmented the actual value of capacitance to 1250 F g−1, and cycle steadiness held 80% of the starting value after 7000 cycles. The equipped MnO2/CNT//AC asymmetric supercapacitor (ASC) manifested preferable energy density with 33.5 Wh kg−1 (at 400 W kg−1). Its glorious electrochemical properties of MnO2/CNT demonstrated that the microwave method has great potency to realise the composite of electrode materials.

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An excellent cycle performance of asymmetric supercapacitor based on bristles like α-MnO2 nanoparticles grown on multiwalled carbon nanotubes

Cited by 73 publications

References 51 publications

An innovative concept of use of redox-active electrolyte in asymmetric capacitor based on MWCNTs/MnO2 and Fe2O3 thin films

An innovative concept of use of redox-active electrolyte in asymmetric capacitor based on MWCNTs/MnO2 and Fe2O3 thin films

Electrolytes for electrochemical energy storage

Synthesis and characterisation of amorphous MnO ₂ /CNT via solid‐state microwave for high‐performance supercapacitors

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An excellent cycle performance of asymmetric supercapacitor based on bristles like α-MnO2 nanoparticles grown on multiwalled carbon nanotubes

Cited by 73 publications

References 51 publications

An innovative concept of use of redox-active electrolyte in asymmetric capacitor based on MWCNTs/MnO2 and Fe2O3 thin films

An innovative concept of use of redox-active electrolyte in asymmetric capacitor based on MWCNTs/MnO2 and Fe2O3 thin films

Electrolytes for electrochemical energy storage

Synthesis and characterisation of amorphous MnO 2 /CNT via solid‐state microwave for high‐performance supercapacitors

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Synthesis and characterisation of amorphous MnO ₂ /CNT via solid‐state microwave for high‐performance supercapacitors