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A high-performance supercapacitor electrode based on tremella-like NiC 2 O 4 @NiO core/shell hierarchical nanostructures on nickel foam.
Dalton Transactions : An International Journal of Inorganic Chemistry 2017 Februrary 15
Tremella-like nickel oxalate@nickel oxide (NiC2 O4 @NiO) core/shell hierarchical nanostructures have been successfully synthesized on nickel foam, using Ni foam as a current collector, a Ni source and a three-dimensional (3D) substrate, through a facile hydrothermal method followed by an electrochemical activation process. The prepared samples can be directly used as binder-free electrodes for supercapacitors. The tremella-like morphology, together with the NiC2 O4 nanoblocks on 3D Ni foam, significantly increases the amount of active sites for redox reactions and the conductivity of the electrode material, shortens the diffusion pathway for ions, facilitates the effective penetration of the electrolyte, and lowers the intrinsic equivalent series resistance, demonstrating good potential for energy storage application. This material has a high specific capacitance of 2287.09 F g-1 at 1 A g-1 , a good cycling stability (remaining 95% after 10 000 cycles) and a good rate capability (83.2% retention upon increasing the current density by 10 times).
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