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Effects of Co/Ni Ratio on the Supercapacitive Properties of α‐Form Hydroxides
Author(s) -
Liu Lan,
Ma KeYuan,
Liu Fu,
Zhang XiaoBin,
Cheng J. P.
Publication year - 2015
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201500118
Subject(s) - hydrotalcite , chemistry , layered double hydroxides , supercapacitor , electrochemistry , hydroxide , coprecipitation , inorganic chemistry , nickel , fourier transform infrared spectroscopy , cobalt hydroxide , chemical engineering , nuclear chemistry , catalysis , electrode , organic chemistry , engineering
α‐Form Co x Ni 1– x hydroxides with different Co/Ni ratios were synthesized by a chemical co‐precipitation method under mild conditions. The effects of Co/Ni ratio on the structure, morphology, and supercapacitive properties of α‐form Co x Ni 1– x hydroxides were investigated in detail. α‐Form Co x Ni 1– x hydroxides had structures similar to those of hydrotalcite and α‐Co(OH) 2 , and they exhibited better electrochemical performance than α‐Co(OH) 2 on testing by XRD, FTIR, and electrochemical performance (when x ≠ 0). The highest specific capacitance at 1 A g –1 for α‐form Co x Ni 1– x hydroxides (for x = 0.2) is 1696.7 F g –1 . An asymmetric supercapacitor packaged with Co 0.6 Ni 0.4 hydroxide and activated carbon as positive and negative material, respectively, had an energy density of 23.5 Wh kg –1 at a power density of 412.5 W kg –1 .