Journal
APPLIED SURFACE SCIENCE
Volume 463, Issue -, Pages 931-938Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2018.09.041
Keywords
delta-MnO2 nanosheets; Hollow carbon nanofibers; High specific capacitance; Energy density; Stability
Categories
Funding
- Open Project of State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials [17kffk10]
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A novel hierarchical hollow nanostructure composed of delta-MnO2 nanosheets deposited by in-situ growth on hollow carbon nanofibers (MnO2/HCNFs) was facilely synthesized using the hydrothermal method. Benefitting from its distinctive hollow structure, nanocomposite of MnO2/HCNFs exhibited an enhanced electrochemical property with higher specific capacitance (293.6 F g(-1) at 0.5 A g(-1) in 1M Na2SO4 electrolyte) compared to non-hollow structure. Further, an asymmetric supercapacitor (ASC) coin cell was assembled with the MnO2/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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