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Fabrication of a 3D Hierarchical Sandwich Co 9 S 8 /α‐MnS@N–C@MoS 2 Nanowire Architectures as Advanced Electrode Material for High Performance Hybrid Supercapacitors
Author(s) -
Kandula Syam,
Shrestha Khem Raj,
Kim Nam Hoon,
Lee Joong Hee
Publication year - 2018
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201800291
Subject(s) - supercapacitor , materials science , electrode , capacitance , power density , nanotechnology , nanowire , electrochemistry , graphene , mesoporous material , fabrication , chemical engineering , optoelectronics , chemistry , catalysis , medicine , power (physics) , physics , biochemistry , alternative medicine , quantum mechanics , pathology , engineering
Supercapacitors suffer from lack of energy density and impulse the energy density limit, so a new class of hybrid electrode materials with promising architectures is strongly desirable. Here, the rational design of a 3D hierarchical sandwich Co 9 S 8 /α‐MnS@N–C@MoS 2 nanowire architecture is achieved during the hydrothermal sulphurization reaction by the conversion of binary mesoporous metal oxide core to corresponding individual metal sulphides core along with the formation of outer metal sulphide shell at the same time. Benefiting from the 3D hierarchical sandwich architecture, Co 9 S 8 /α‐MnS@N–C@MoS 2 electrode exhibits enhanced electrochemical performance with high specific capacity/capacitance of 306 mA h g −1 /1938 F g −1 at 1 A g −1 , and excellent cycling stability with a specific capacity retention of 86.9% after 10 000 cycles at 10 A g −1 . Moreover, the fabricated asymmetric supercapacitor device using Co 9 S 8 /α‐MnS@N–C@MoS 2 as the positive electrode and nitrogen doped graphene as the negative electrode demonstrates high energy density of 64.2 Wh kg −1 at 729.2 W kg −1 , and a promising energy density of 23.5 Wh kg −1 is still attained at a high power density of 11 300 W kg −1 . The hybrid electrode with 3D hierarchical sandwich architecture promotes enhanced energy density with excellent cyclic stability for energy storage.