Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 8, Issue 4, Pages 2562-2572Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b10158
Keywords
Ni/Co-LDHs; self-assembly; large-scale; three-dimensional; flexible asymmetric supercapacitors
Funding
- China Postdoctoral Science Foundation [2015M571837]
- Foundation Research Project of Jiangsu Province [SBK2015042317]
- National Natural Science Foundation of China [61574163]
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In this study, a facile and inexpensive and self-assembled strategy to massively fabricate Ni/Co layered double hydroxides (LDHs) is developed under mild reaction conditions (55 degrees C). The resulting composite material displays a special three-dimensional hierarchical microsphere structure with well-defined flower-like configuration. The fabrication mechanism can be ascribed to stepwise and regular reaction process of nanoparticles and nanosheets gradually growing to nanopetals and then assembling into flower-like microspheres, based on the systematically investigation of various reaction factors including the Ni:Co feeding ratio, the reaction time and the initial pH-value. Because of its large surface, ultrathin feature and synergetic results of this Ni/Co LDHs nanosheets (20 nm), these Ni/Co-LDHs microspheres deliver an excellent capacitance value about 2228 F.g(-1) (1 A.g(-1)). An all-solid-state flexible asymmetric supercapacitor is designed and assembled by exploiting this Ni/Co-LDHs as the positive materials, which exhibits energy density of 165.51 Wh.kg(-1) at 1.53 KW.kg(-1). It may have vast potential significance in personal wearable equipment. Moreover, this monolithic design provides a promising approach for large scale fabrication of other LDHs materials.
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