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Direct Growth of 3 D Hierarchical Porous Ni 3 S 2 Nanostructures on Nickel Foam for High‐Performance Supercapacitors
Author(s) -
Yilmaz Gamze,
Lu Xianmao
Publication year - 2016
Publication title -
chemnanomat
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.947
H-Index - 32
ISSN - 2199-692X
DOI - 10.1002/cnma.201600070
Subject(s) - supercapacitor , nanoporous , materials science , capacitance , fabrication , current density , nickel , anode , power density , nanostructure , cathode , electrochemistry , nanotechnology , electrode , porosity , chemical engineering , composite material , metallurgy , chemistry , power (physics) , medicine , alternative medicine , physics , pathology , quantum mechanics , engineering
Hierarchical nanostructures grown on conductive 3D scaffold materials are excellent candidates for supercapacitor electrodes. Herein, we report the fabrication and electrochemical performance of 3D Ni 3 S 2 nanoporous structures directly grown on nickel foam via a facile and cost‐effective one‐step process using Ni foam as both the template and Ni source. An ultrahigh areal capacitance of 7.25 F cm −2 was obtained at a current density of 5 mA cm −2 for the nanoporous Ni 3 S 2 structures. The encouraging performance of Ni 3 S 2 nanoporous structures allowed for the fabrication of asymmetric supercapacitors (ASCs) using Ni 3 S 2 as cathode and activated carbon as anode. The resulting ASC exhibited high volumetric capacitance (4.48 F cm −3 at 6 mA cm −2 ), high energy density (1.54 mWh cm −3 at a power density of 0.07 W cm −3 ), and excellent cycling stability (92.7 % retention of the initial capacitance after 5000 cycles at a current density of 16 mA cm −2 ).