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1 D Hierarchical MnCo 2 O 4 Nanowire@MnO 2 Sheet Core–Shell Arrays on Graphite Paper as Superior Electrodes for Asymmetric Supercapacitors
Author(s) -
Liu Shude,
Hui Kwan San,
Hui Kwun Nam
Publication year - 2015
Publication title -
chemnanomat
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.947
H-Index - 32
ISSN - 2199-692X
DOI - 10.1002/cnma.201500105
Subject(s) - supercapacitor , materials science , capacitance , anode , graphene , electrode , nanowire , graphite , power density , cathode , electrochemistry , oxide , nanotechnology , optoelectronics , chemical engineering , composite material , power (physics) , metallurgy , electrical engineering , chemistry , physics , engineering , quantum mechanics
Abstract Heterostructured metal oxide core–shell architectures have attracted considerable attention owing to their superior electrochemical performance in supercapacitors compared to a single structure. Here, we report a simple and effective synthesis of hierarchical MnCo 2 O 4 nanowire@MnO 2 sheet core–shell nanostructures anchored on graphite paper for use in supercapacitors. The proposed electrode exhibits a specific capacitance of 2262 F g −1 at 1 A g −1 . In addition, good rate capability and excellent cycling performance are observed. An asymmetric supercapacitor with operating potential at 1.6 V is demonstrated using MnCo 2 O 4 @MnO 2 as cathode and graphene/nickel foam (NF) as anode. The MnCo 2 O 4 @MnO 2 //graphene/NF asymmetric device shows a high energy density of 85.7 Wh kg −1 at a power density of 800 W kg −1 while maintaining a high energy density of 34.7 Wh kg −1 at 24 kW kg −1 . Moreover, the device demonstrates a long‐term cycling stability of 81.6 % retention of its initial specific capacitance.