TY - JOUR
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
N1 - Funding Information:
This work was financially supported by the Open Project of State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials (Grant No. 17kffk10 )
Publisher Copyright:
© 2018
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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U2 - 10.1016/j.apsusc.2018.09.041
DO - 10.1016/j.apsusc.2018.09.041
M3 - Article
AN - SCOPUS:85053042048
SN - 0169-4332
VL - 463
SP - 931
EP - 938
JO - Applied Surface Science
JF - Applied Surface Science
ER -