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Shape‐Controlled Synthesis of NiCo 2 O 4 Microstructures and Their Application in Supercapacitors
Author(s) -
Xiang Nannan,
Ni Yonghong,
Ma Xiang
Publication year - 2015
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.201500386
Subject(s) - supercapacitor , microstructure , materials science , metallurgy , capacitance , chemistry , electrode
The shape‐controlled synthesis of NiCo 2 O 4 microstructures through a facile hydrothermal method and subsequent calcinations was explored. By employing CoSO 4 , NiSO 4 , and urea as the starting reactants, flower‐like NiCo 2 O 4 microstructures were obtained at 100 °C after 5 h without the assistance of any additive and subsequent calcination at 300 °C for 2 h; dumbbell‐like NiCo 2 O 4 microstructures were prepared at 150 °C after 5 h in the presence of trisodium citrate and subsequent calcination at 300 °C for 2 h. The as‐prepared NiCo 2 O 4 microstructures were characterized by X‐ray powder diffraction, field‐emission scanning electron microscopy, energy‐dispersive X‐ray spectroscopy, and (high‐resolution) transmission electron microscopy. Both the flower‐like and dumbbell‐like NiCo 2 O 4 microstructures could be used as electrode materials for supercapacitors, and they exhibited excellent electrochemical performance, including high specific capacitance, good rate capability, and excellent long‐term cycle stability. Simultaneously, the shape‐dependent electrochemical properties of the product were investigated.