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Carambola-like Ni@Ni1.5Co1.5S2 for Use in High-Performance Supercapacitor Devices Design

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journal contribution
posted on 2015-11-02, 00:00 authored by Wutao Wei, Liwei Mi, Shizhong Cui, Bin Wang, Weihua Chen
Studies on supercapacitor devices constitute one of the most meaningful research topics in hastening the industrialization of electrode materials. Herein, uniform nanosheet-based carambola-like Ni@Ni1.5Co1.5S2 was successfully synthesized and assembled into an asymmetric supercapacitor device with a high specific capacitance of 109 F g–1 at a current density of 1 A g–1. The large mass loading of this device, at ∼20 mg cm–2, is compatible with the industry standard and considerably higher than those obtained in previous reports. The Ni@Ni1.5Co1.5S2-based supercapacitor device exhibited excellent cycling stability with virtually no decrease in capacitance after 2000 cycles, and achieved a high energy density of 65.7 W h kg–1 at a power density of 22.2 W kg–1 and a high power density of 3 kW kg–1 at energy density of 6.2 W h kg–1. These outstanding characteristics of Ni@Ni1.5Co1.5S2 as an electrode material for supercapacitor devices verify its promising applicability in the energy storage field.