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Novel Core–Shell FeOF/Ni(OH) 2 Hierarchical Nanostructure for All‐Solid‐State Flexible Supercapacitors with Enhanced Performance
Author(s) -
Wang Mengqiao,
Li Zhaoqiang,
Wang Chengxiang,
Zhao Ruizheng,
Li Caixia,
Guo Dexiang,
Zhang Luyuan,
Yin Longwei
Publication year - 2017
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201701014
Subject(s) - supercapacitor , materials science , capacitance , electrochemistry , nanorod , nanostructure , chemical engineering , electrode , hydroxide , nanotechnology , power density , current density , microstructure , specific surface area , composite material , catalysis , chemistry , organic chemistry , power (physics) , physics , quantum mechanics , engineering
Well‐controlled core–shell hierarchical nanostructures based on oxyfluoride and hydroxide are for the first time rationally designed and synthesized via a simple solvothermal and chemical precipitation route, in which FeOF nanorod acts as core and porous Ni(OH) 2 nanosheets as shell. When evaluated as electrodes for supercapacitors, a high specific capacitance of 1452 F g −1 can be obtained at a current density of 1 A g −1 . Even as the current density increases to 10 A g −1 , the core–shell hybrid still reserves a noticeable capacitance of 1060 F g −1 , showing an excellent rate capacity. Furthermore, all‐solid‐state flexible asymmetric supercapacitor based on the FeOF/Ni(OH) 2 hybrid as a positive electrode and activated carbon as a negative electrode shows high power density, high energy density, and long cycling lifespan. The excellent electrochemical performance of the FeOF/Ni(OH) 2 core–shell hybrid is ascribed to the unique microstructure and synergistic effects. FeOF nanorod from FeF 3 by partial substitution of fluorine with oxygen behaves as a low intrinsic resistance, thus facilitating charge transfer processes. While the hierarchical Ni(OH) 2 nanosheets with large surface area provide enough active sites for redox chemical reactions, leading to greatly enhanced electrochemical activity. The well‐controllable oxyfluoride/hydroxide hybrid is inspiring, opening up a new way to design new electrodes for next‐generation all‐solid‐state supercapacitors.