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Mixed Cu 2 Se Hexagonal Nanosheets@Co 3 Se 4 Nanospheres for High‐Performance Asymmetric Supercapacitors
Author(s) -
Li Ang,
Zhai Miaomiao,
Luan Mingxing,
Hu Jingbo
Publication year - 2021
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.202100857
Subject(s) - materials science , supercapacitor , anode , electrode , electrochemistry , capacitance , chemical engineering , cathode , hydrothermal circulation , power density , nanotechnology , chemistry , power (physics) , physics , quantum mechanics , engineering
Rational designing and constructing multiphase hybrid electrode materials is an effective method to compensate for the performance defects of the single component. Based on this strategy, Cu 2 Se hexagonal nanosheets@Co 3 Se 4 nanospheres mixed structures have been fabricated by a facile two‐step hydrothermal method. Under the synergistic effect of the high ionic conductivity of Cu 2 Se and the remarkable cycling stability of Co 3 Se 4 , Cu 2 Se@Co 3 Se 4 can exhibit outstanding electrochemical performance as a novel electrode material. The as‐prepared Cu 2 Se@Co 3 Se 4 electrode displays high specific capacitance of 1005 F g −1 at 1 A g −1 with enhanced rate capability (56 % capacitance retention at 10 A g −1 ), and ultralong lifespan (94.2 % after 10 000 cycles at 20 A g −1 ). An asymmetric supercapacitor is assembled applying the Cu 2 Se@Co 3 Se 4 as anode and graphene as cathode, which delivers a wide work potential window of 1.6 V, high energy density (30.9 Wh kg −1 at 0.74 kW kg −1 ), high power density (21.0 Wh kg −1 at 7.50 kW kg −1 ), and excellent cycling stability (85.8 % after 10 000 cycles at 10 A g −1 ).