Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10141452 | Applied Surface Science | 2019 | 26 Pages |
Abstract
A novel hierarchical hollow nanostructure composed of δ-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 (293.6â¯Fâ¯gâ1 at 0.5â¯Aâ¯gâ1 in 1â¯M 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 63.9â¯Fâ¯gâ1 at a high operating voltage window up to 2â¯V. Moreover, the ASC coin cell possessed a high energy density of 35.1â¯Whâ¯kgâ1 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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Authors
Peng Zhao, Mengqi Yao, Hongbo Ren, Ni Wang, Sridhar Komarneni,