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Anion‐Exchange Formation of Hollow NiCo 2 S 4 Nanoboxes from Mesocrystalline Nickel Cobalt Carbonate Nanocubes towards Enhanced Pseudocapacitive Properties
Author(s) -
Hou Linrui,
Hua Hui,
Bao Ruiqi,
Chen Zhiyi,
Yang Chao,
Zhu Siqi,
Pang Gang,
Tong Liuniu,
Yuan Changzhou,
Zhang Xiaogang
Publication year - 2016
Publication title -
chempluschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.801
H-Index - 61
ISSN - 2192-6506
DOI - 10.1002/cplu.201600175
Subject(s) - materials science , supercapacitor , electrochemistry , electrolyte , nickel , capacitance , electrode , cobalt , power density , chemical engineering , fabrication , ion exchange , nanotechnology , ion , metallurgy , chemistry , organic chemistry , medicine , power (physics) , physics , alternative medicine , quantum mechanics , pathology , engineering
An efficient anion‐exchange protocol was investigated for the controllable fabrication of hollow NiCo 2 S 4 nanoboxes (NBs) from mesocrystalline nickel cobalt carbonate nanocubes as promising pseudocapacitive materials for electrochemical capacitors. The underlying processes of the formation of the hollow architecture were systematically investigated. Originating from the unique structural and compositional advantages, the resultant hollow NiCo 2 S 4 NB electrode with a loading of 5 mg cm 2 delivered a large specific capacitance of 777 F g −1 at a high rate of 4 A g −1 in a three‐electrode configuration with 6 m KOH as electrolyte. Furthermore, an asymmetric device constructed with the hollow NBs and activated carbon (AC) as positive and negative electrodes, respectively, showed extraordinary supercapacitance within an electrochemically operating voltage window from 0.0 to 1.5 V. The unique AC//NiCo 2 S 4 NB hybrid capacitor exhibited a large specific energy density (active mass normalized) of approximately 17.1 W h kg −1 at a high power density of 2250 W kg −1 , and desirable cycling durability with approximately 75 % specific capacitance retention after 5000 consecutive cycles at a current rate of 2 A g −1 . These electrochemical investigations strongly indicated that the as‐fabricated hollow NiCo 2 S 4 NBs can be elegantly utilized as powerful candidates for advanced electrode platforms.