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Synthesis of Double‐Layered NiCo 2 O 4 ‐Nanosheet‐Loaded PAN/Lignin‐Based Hollow Carbon Nanofibers for High‐Performance Supercapacitor
Author(s) -
Yang Xiaoxiao,
Mao Linchang,
Peng Wei,
Jin Junhong,
Yang Shenglin,
Li Guang
Publication year - 2020
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201904546
Subject(s) - supercapacitor , materials science , capacitance , polyacrylonitrile , nanosheet , electrochemistry , electrode , nanofiber , composite number , carbon fibers , chemical engineering , carbon nanofiber , carbonization , composite material , nanotechnology , carbon nanotube , scanning electron microscope , polymer , chemistry , engineering
Polyacrylonitrile (PAN) /lignin based hollow carbon nanofibers (HCNF) were fabricated by coaxial electrospinning method followed by carbonization procedure. The results show that the NiCo 2 O 4 oxides were successfully deposited on the surface of HCNF by a facile hydrothermal method without any toxic reagents and NiCo 2 O 4 nanosheets are uniformly deposited on the inner and outer layers of HCNF. The electrochemical results show that NiCo 2 O 4 @HCNF composite had excellent electrochemical properties. The electrochemical measurements indicate that the NiCo 2 O 4 @HCNF possessed considerable capacitance 1998.18 mF/cm 2 at 2 mA/cm 2 (1665 F/g with the mass loading of 1.2 mg/cm 2 ) and an excellent cycling stability, specific capacitance can retain 87% after 5000 cycle numbers under the current density of 10 mA/cm 2 . In addition, an asymmetric supercapacitor (NiCo 2 O 4 @HCNF//active carbon (AC)) was assembled by NiCo 2 O 4 @HCNF (positive electrode) and AC (negative electrode). The device exhibits high capacitance 111 F/g at 1 A/g, excellent energy density (40.3 Wh/kg at 810W/kg), and excellent cycling stability (92% capacitance can retain after 5000 charge‐discharge at 5 A/g). The experimental results show that the hollow structure of the hollow carbon nanofiber benefits the double layered growth of NiCo 2 O 4 , which can improve the capacitance performance. Therefore, the composite exhibits excellent electrochemical properties.