Nanocomposites of hierarchical ultrathin MnO                         2                          nanosheets/hollow carbon nanofibers for high-performance asymmetric supercapacitors

Peng Zhao; Mengqi Yao; Hongbo Ren; Ni Wang; Sridhar Komarneni

doi:10.1016/j.apsusc.2018.09.041

Nanocomposites of hierarchical ultrathin MnO ₂ nanosheets/hollow carbon nanofibers for high-performance asymmetric supercapacitors

Peng Zhao, Mengqi Yao, Hongbo Ren, Ni Wang, Sridhar Komarneni

Research output: Contribution to journal › Article › peer-review

152 Scopus citations

Abstract

A novel hierarchical hollow nanostructure composed of δ-MnO ₂ nanosheets deposited by in-situ growth on hollow carbon nanofibers (MnO ₂ /HCNFs) was facilely synthesized using the hydrothermal method. Benefitting from its distinctive hollow structure, nanocomposite of MnO ₂ /HCNFs exhibited an enhanced electrochemical property with higher specific capacitance (293.6 F g ⁻¹ at 0.5 A g ⁻¹ in 1 M Na ₂ SO ₄ electrolyte) compared to non-hollow structure. Further, an asymmetric supercapacitor (ASC) coin cell was assembled with the MnO ₂ /HCNFs nanocomposites (positive electrode) and KOH-activated porous carbon nanofibers (PCNFs) (negative electrode). The asymmetric supercapacitor coin cell exhibited a maximum specific capacitance of 63.9 F g ⁻¹ at a high operating voltage window up to 2 V. Moreover, the ASC coin cell possessed a high energy density of 35.1 Wh kg ⁻¹ and showed a remarkable cycling stability and only 8.9% capacitance loss was found after 10,000 cycles, which implied the practicability for energy storage.

Original language	English (US)
Pages (from-to)	931-938
Number of pages	8
Journal	Applied Surface Science
Volume	463
DOIs	https://doi.org/10.1016/j.apsusc.2018.09.041
State	Published - Jan 1 2019

All Science Journal Classification (ASJC) codes

General Chemistry
Condensed Matter Physics
General Physics and Astronomy
Surfaces and Interfaces
Surfaces, Coatings and Films

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10.1016/j.apsusc.2018.09.041

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Zhao, P., Yao, M., Ren, H., Wang, N., & Komarneni, S. (2019). Nanocomposites of hierarchical ultrathin MnO ₂ nanosheets/hollow carbon nanofibers for high-performance asymmetric supercapacitors Applied Surface Science, 463, 931-938. https://doi.org/10.1016/j.apsusc.2018.09.041

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title = " Nanocomposites of hierarchical ultrathin MnO 2 nanosheets/hollow carbon nanofibers for high-performance asymmetric supercapacitors ",

abstract = " A novel hierarchical hollow nanostructure composed of δ-MnO 2 nanosheets deposited by in-situ growth on hollow carbon nanofibers (MnO 2 /HCNFs) was facilely synthesized using the hydrothermal method. Benefitting from its distinctive hollow structure, nanocomposite of MnO 2 /HCNFs exhibited an enhanced electrochemical property with higher specific capacitance (293.6 F g −1 at 0.5 A g −1 in 1 M Na 2 SO 4 electrolyte) compared to non-hollow structure. Further, an asymmetric supercapacitor (ASC) coin cell was assembled with the MnO 2 /HCNFs nanocomposites (positive electrode) and KOH-activated porous carbon nanofibers (PCNFs) (negative electrode). The asymmetric supercapacitor coin cell exhibited a maximum specific capacitance of 63.9 F g −1 at a high operating voltage window up to 2 V. Moreover, the ASC coin cell possessed a high energy density of 35.1 Wh kg −1 and showed a remarkable cycling stability and only 8.9% capacitance loss was found after 10,000 cycles, which implied the practicability for energy storage.",

author = "Peng Zhao and Mengqi Yao and Hongbo Ren and Ni Wang and Sridhar Komarneni",

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Zhao, P, Yao, M, Ren, H, Wang, N & Komarneni, S 2019, ' Nanocomposites of hierarchical ultrathin MnO ₂ nanosheets/hollow carbon nanofibers for high-performance asymmetric supercapacitors ', Applied Surface Science, vol. 463, pp. 931-938. https://doi.org/10.1016/j.apsusc.2018.09.041

Nanocomposites of hierarchical ultrathin MnO ₂ nanosheets/hollow carbon nanofibers for high-performance asymmetric supercapacitors . / Zhao, Peng; Yao, Mengqi; Ren, Hongbo et al.
In: Applied Surface Science, Vol. 463, 01.01.2019, p. 931-938.

Research output: Contribution to journal › Article › peer-review

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T1 - Nanocomposites of hierarchical ultrathin MnO 2 nanosheets/hollow carbon nanofibers for high-performance asymmetric supercapacitors

AU - Zhao, Peng

AU - Yao, Mengqi

AU - Ren, Hongbo

AU - Wang, Ni

AU - Komarneni, Sridhar

PY - 2019/1/1

Y1 - 2019/1/1

N2 - A novel hierarchical hollow nanostructure composed of δ-MnO 2 nanosheets deposited by in-situ growth on hollow carbon nanofibers (MnO 2 /HCNFs) was facilely synthesized using the hydrothermal method. Benefitting from its distinctive hollow structure, nanocomposite of MnO 2 /HCNFs exhibited an enhanced electrochemical property with higher specific capacitance (293.6 F g −1 at 0.5 A g −1 in 1 M Na 2 SO 4 electrolyte) compared to non-hollow structure. Further, an asymmetric supercapacitor (ASC) coin cell was assembled with the MnO 2 /HCNFs nanocomposites (positive electrode) and KOH-activated porous carbon nanofibers (PCNFs) (negative electrode). The asymmetric supercapacitor coin cell exhibited a maximum specific capacitance of 63.9 F g −1 at a high operating voltage window up to 2 V. Moreover, the ASC coin cell possessed a high energy density of 35.1 Wh kg −1 and showed a remarkable cycling stability and only 8.9% capacitance loss was found after 10,000 cycles, which implied the practicability for energy storage.

AB - A novel hierarchical hollow nanostructure composed of δ-MnO 2 nanosheets deposited by in-situ growth on hollow carbon nanofibers (MnO 2 /HCNFs) was facilely synthesized using the hydrothermal method. Benefitting from its distinctive hollow structure, nanocomposite of MnO 2 /HCNFs exhibited an enhanced electrochemical property with higher specific capacitance (293.6 F g −1 at 0.5 A g −1 in 1 M Na 2 SO 4 electrolyte) compared to non-hollow structure. Further, an asymmetric supercapacitor (ASC) coin cell was assembled with the MnO 2 /HCNFs nanocomposites (positive electrode) and KOH-activated porous carbon nanofibers (PCNFs) (negative electrode). The asymmetric supercapacitor coin cell exhibited a maximum specific capacitance of 63.9 F g −1 at a high operating voltage window up to 2 V. Moreover, the ASC coin cell possessed a high energy density of 35.1 Wh kg −1 and showed a remarkable cycling stability and only 8.9% capacitance loss was found after 10,000 cycles, which implied the practicability for energy storage.

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Nanocomposites of hierarchical ultrathin MnO ₂ nanosheets/hollow carbon nanofibers for high-performance asymmetric supercapacitors

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