We report a rationally designed two-step method to fabricate self-supported NiS nanosheet arrays. We first used 2-methylimidazole (2-MI), an organic molecule commonly served as organic linkers in metal-organic frameworks (MOFs), to synthesize an α-Ni(OH) nanosheet array as a precursor, followed by its hydrothermal sulfidization into NiS. The resulting NiS nanosheet array demonstrated superior supercapacitance properties, with a very high capacitance of about 1,000 F g being delivered at a high current density of 50 A g for 20,000 charge-discharge cycles. This performance is unparalleled by other reported nickel sulfide-based supercapacitors and is also advantageous compared to other nickel-based materials such as NiO and Ni(OH). An asymmetric supercapacitor was then established, exhibiting a very stable capacitance of about 200 F g at a high current density of 10 A g for 10,000 cycles and a surprisingly high energy density of 202 W h kg. This value is comparable to that of the lithium-ion batteries, i.e., 180 W h kg. The potential of the material for practical applications was evaluated by building a quasi-solid-state asymmetric supercapacitor which showed good flexibility and power output, and two of these devices connected in series were able to power up 18 green light-emitting diodes.

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http://dx.doi.org/10.1021/acsami.6b14746DOI Listing

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