Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6609271 | Electrochimica Acta | 2016 | 11 Pages |
Abstract
Graphene-coupled flower-like nickel sulfide monoliths that exhibit ultra-light, mesoporous structures and uniform particle sizes are successfully prepared using an F127-assisted hydrothermal method and high-temperature pyrolysis. As an electrode material for supercapacitors, the as-prepared rGO-Ni3S2 shows ultra-high specific capacitances of 1315 and 1050Â FÂ gâ1 at 1 and 10Â AÂ gâ1, respectively. After 1000 charge/discharge cycles at a current density of 1Â AÂ gâ1, the specific capacitance increases by almost 15%, indicating the excellent capacitance and durability of rGO-Ni3S2. Further, an asymmetric supercapacitor using rGO-Ni3S2 as positive electrode and active carbon as negative electrode exhibits high specific capacitance of 104.6Â FÂ gâ1 at 0.5Â AÂ gâ1, and excellent cycling stability with 85.6% capacitance retention after 5000 cycles at a current density of 4Â AÂ gâ1. These promising supercapacitor performances demonstrate that the as-developed surfactant-assisted hydrothermal strategy can be widely used to prepare graphene-coupled metal sulfides for high-performance supercapacitor applications.
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Authors
Hualin Lin, Fan Liu, Xinjing Wang, Yani Ai, Zhaoquan Yao, Lei Chu, Sheng Han, Xiaodong Zhuang,