Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 5, Issue 21, Pages 10574-10582Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am402436q
Keywords
asymmetric supercapacitors; nickel hydroxide; cobalt oxide; core-shell nanostructure
Funding
- National University of Singapore (NUS)
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Pseudocapacitors based on fast surface Faradaic reactions can achieve high energy densities together with high power densities. Usually, researchers develop a thin layer of active materials to increase the energy density by enhancing the surface area; meanwhile, this sacrifices the mass loading. In this work, we developed a novel 3D core-shell Co3O4@ Ni(OH)(2), electrode that can provide high energy density with very high mass loading. Core-shell porous nanowires (Co3O4@Ni(OH)(2)) were directly grown on a Ni current collector as an integrated electrode/collector for the supercapacitor anode. This Co3O4@Ni(OH)(2) core-shell nanoarchitectured electrode exhibits an ultrahigh areal capacitance of 15.83 F cm(-2). The asymmetric supercapacitor prototypes, assembled using Co3O4@Ni(OH)(2) as the anode, reduced graphene oxide (RGO) or active carbon (AC) as the cathode, and 6 M aqueous KOH as the electrolyte, exhibit very high energy densities falling into the energy-density range of Li-ion batteries. Because of the large mass loading and high energy density, the prototypes can drive a minifan or light a bulb even though the size is very small. These results indicate that our asymmetric supercapacitors have outstanding potential in commercial applications. Systematic study and scientific understanding were carried out.
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