High performance MnO2 nanoflower electrode and the relationship between solvated ion size and specific capacitance in highly conductive electrolytes

Misnon, Izan Izwan; Aziz, Radhiyah Abd; Zain, Nurul Khairiyyah Mohd; Vidhyadharan, Baiju; Krishnan, Syam G.; Jose, Rajan

doi:10.1016/j.materresbull.2014.05.044

Cited by 147 publications

(66 citation statements)

References 55 publications

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“…These results indicate that the capacitances for both porous carbons in the IL electrolyte are lower than in aqueous electrolytes, and the decay of capacitance at higher discharge current is even more severe, although the rate performance for the two carbons in our case is already better than good results in literatures for carbon materials in IL electrolytes such as carbon nanofibers [36] and heteroatom-doped-graphene in IL [37]. The lower capacitance and the deteriorate rate performance in IL than in the KOH are attributed to the relative difference between pore size in the electrode and size of the ions in the electrolyte [31]. The durability of the supercapacitors containing the IL electrolyte was also examined.…”

Section: Electrochemical Performance In the Il Electrolytesupporting

confidence: 42%

“…As is expected the capacitance decreased with the increasing current density due to that the ions movement is limited only to the surfaces of the electrode material at a higher current density [31], and the rate performance can be improved by optimizing the pore size distribution of the carbons. It can be seen for CNF-800, the capacitance measured at 20 A g -1 still retained 79% of its value measured at 0.5 A g -1 .…”

Section: Figurementioning

confidence: 70%

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The enhancement of electrochemical capacitance of biomass-carbon by pyrolysis of extracted nanofibers

Deng

Zhong

Wang

et al. 2017

Electrochimica Acta

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The enhancement of electrochemical capacitance of biomass-carbon by pyrolysis of extracted nanofibers, Electrochimica Acta http://dx.doi.org/10. 1016/j.electacta.2017.01.099 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. extracted from an inexpensive natural fungus using a hydrothermal method and were converted to porous carbon nanofibers (CNFs) by potassium hydroxide activation.The porous carbons were assembled into symmetric supercapacitors using both potassium hydroxide and an ionic liquid (IL) as electrolytes. Solid state nuclear magnetic resonance characterization showed that the micropores of the as-prepared carbons are accessible to the IL electrolyte when uncharged and thus high capacitance is expected. It is found in both electrolytes the electrochemical capacitances of CNFs are significantly higher than those of the porous carbon derived directly from the crude fungus. Furthermore, the CNFs delivered an extraordinary energy density of 92.3 Wh kg -1 in the IL electrolyte, making it a promising candidate for electrode materials for supercapacitors.

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Section: Electrochemical Performance In the Il Electrolytesupporting

confidence: 42%

Section: Figurementioning

confidence: 70%

The enhancement of electrochemical capacitance of biomass-carbon by pyrolysis of extracted nanofibers

Deng

Zhong

Wang

et al. 2017

Electrochimica Acta

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“…5a, d, there are some particles and holes on the surface of nanosheets. The size of NiMn 2 O 4 nanopores is larger than the hydrated ions [33]; therefore, the hydrated ions could be easily penetrated on the surface of the NiMn 2 O 4 nanosheets. Also, Fig.…”

Section: Resultsmentioning

confidence: 99%

Growth and electrochemical performance of porous NiMn2O4 nanosheets with high specific surface areas

Yan

Qiu

et al. 2015

J Solid State Electrochem

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In this work, porous NiMn 2 O 4 nanosheets with large surface areas are successfully grown by a hydrothermal method and examined as electrodes for supe rcapac itors. Resu lts h ave sho wn th at the supercapacitor based on NiMn 2 O 4 electrodes exhibits the highest specific capacitance of 1321.6 F g −1 at a scan rate of 2 A g −1 , much higher than those of other supercapacitors made of metal oxides and composites. The NiMn 2 O 4 supercapacitor also shows a good cycling behavior, only 6.5 % capacitance decay after 1500 cycles. The NiMn 2 O 4 nanosheets possess a robust mechanical adhesion to Ni foam, which has been demonstrated by an ultrasonication test.

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“…31 The decrease in specific capacitance with increase in scan rate was also reported by Sankar et al 31 Sankar et al 31 also reported a specific capacitance of 94 F g −1 for Mn 3 O 4 with an average size of 50 nm with 6 M KOH electrolyte. 9 Misnon et al 35 had reported a specific capacitance of 294.6 F g −1 for nanoflower-like MnO 2 with 1 M KOH electrolyte at the scan rate of 2 mV s −1 . 35 But Mn 2 O 3 nanospheres exhibit a specific capacitance of 40-50 F g −1 with 6 M KOH electrolyte at the scan rate of 5 mV s −1 .…”

Section: Study Of Electrochemical Responsementioning

confidence: 99%

Mixed valence nanostructured Mn3O4 for supercapacitor applications

Bose

Biju

2015

Bull Mater Sci

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Nanostructured Mn 3 O 4 with an average crystallite size of ∼19 nm was synthesized through a microwave-assisted chemical route. Structural characterization was carried out using X-ray diffraction analysis and transmission electron microscopy. Observed change in the ratio of lattice constants, c/a for the sample compared with single-crystalline Mn 3 O 4 points to the presence of Mn 4+ ions at the octahedral sites. This is attributed to the presence of cation vacancies. X-ray photoelectron spectroscopic studies confirm the presence of Mn 4+ ions. Specific capacitance value of 665.08 F g −1 was obtained for symmetric supercapacitor with Mn 3 O 4 active material at slow scan rate. Reasonably high power and energy density values, viz., 4.27 kW kg −1 and 4.36 × 10 −2 Wh kg −1 , respectively, were obtained for charge-discharge cycles at a constant current of 12.74 mA cm −2 .

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High performance MnO2 nanoflower electrode and the relationship between solvated ion size and specific capacitance in highly conductive electrolytes

Cited by 147 publications

References 55 publications

The enhancement of electrochemical capacitance of biomass-carbon by pyrolysis of extracted nanofibers

The enhancement of electrochemical capacitance of biomass-carbon by pyrolysis of extracted nanofibers

Growth and electrochemical performance of porous NiMn2O4 nanosheets with high specific surface areas

Mixed valence nanostructured Mn3O4 for supercapacitor applications

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