Journal
NEW CARBON MATERIALS
Volume 31, Issue 1, Pages 37-45Publisher
ELSEVIER
DOI: 10.1016/S1872-5805(16)60003-3
Keywords
Cobalt nickel double hydroxides; Nanocomposite; Asymmetric supercapacitor; Energy storage
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Funding
- National Natural Science Foundation of China [51402324, 51402325, 51302281]
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A high performance asymmetric supercapacitor was fabricated using a CoNi-layered double hydroxide (CoNi-LDH) as the positive electrode and activated carbon as the negative electrode in an electrolyte of 6 M aqueous KOH. The supercapacitor tan be cycled reversibly in a wide potential window of 0-1. 5 V and exhibits a remarkable energy density of 46. 3 Wh . kg(-1) at a power density of 102. 3 W . kg(-1), a high energy density of 25. 6 Wh . kg(-1) even at a high power density of 1 704. 5 W . kg(-1) These values are much higher than those of a symmetric supercapacitor using only activated carbon (6. 9 Wh . kg(-1)). The results can be ascribed to the high specific capacitance and rate capability of the CoNi-LDH, and the complementary potential windows of the two electrodes that increase the working voltage of the supercapacitor. The supercapacitor also exhibits stable cycling with a 84.5% capacitance retention after 1 000 cycles.
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