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Nickel Phosphite Superstructures Assembled by Nanotubes: Original Application for Effective Electrode Materials of Supercapacitors
Author(s) -
Pang Huan,
Wei Chengzhen,
Ma Yahui,
Zhao Shanshan,
Li Guochang,
Zhang Jiangshan,
Chen Jing,
Li Sujuan
Publication year - 2013
Publication title -
chempluschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.801
H-Index - 61
ISSN - 2192-6506
DOI - 10.1002/cplu.201300015
Subject(s) - supercapacitor , materials science , nickel , nanosheet , electrode , capacitance , superstructure , chemical engineering , hydrothermal synthesis , polystyrene , sulfonic acid , nanotube , nanotechnology , hydrothermal circulation , inorganic chemistry , chemistry , polymer chemistry , composite material , carbon nanotube , metallurgy , oceanography , geology , engineering , polymer
Nickel phosphite (Ni 11 (HPO 3 ) 8 (OH) 6 ) superstructures assembled by nanotubes are synthesized under mild hydrothermal conditions with the sodium salt of polystyrene sulfonic acid. More importantly, Ni 11 (HPO 3 ) 8 (OH) 6 superstructures are applied as electrode materials for supercapacitors. Benefitting from their novel superstructures, in a three‐electrode system, Ni 11 (HPO 3 ) 8 (OH) 6 superstructure electrodes show a good specific capacitance (1876 F g −1 at 0.625 A g −1 ), good rate capability, and excellent cycling properties (95 % of the initial specific capacitance at 6.25 A g −1 after 2000 cycles) in 3.0 M KOH. Additionally, asymmetric Ni 11 (HPO 3 ) 8 (OH) 6 –graphene nanosheet supercapacitors are also designed. The specific energy of a cell in 3.0 M KOH reaches about 28.6 Wh kg −1 at 92.5 W kg −1 .