期刊
ACS APPLIED MATERIALS & INTERFACES
卷 9, 期 1, 页码 496-504出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b14746
关键词
Ni3S2; nanosheets; self-supported; asymmetric supercapacitor; high energy density
资金
- National Research Foundation, Prime Minister's Office, Singapore under its Competitive Research Programme (CRP Award) [NRF-CRP 10-2012-6]
We report a rationally designed two-step method to fabricate self-supported Ni3S2 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 alpha-Ni(OH)(2) nanosheet array as a precursor, followed by its hydrothermal sulfidization into Ni3S2. The resulting Ni3S2 nanosheet array demonstrated superior supercapacitance properties, with a very high capacitance of about 1,000 F g(-1) being delivered at a high current density of 50 A g(-1) 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)(2). An asymmetric supercapacitor was then established, exhibiting a very stable capacitance of about 200 F g(-1) at a high current density of 10 A g(-1) for 10,000 cycles and a surprisingly high energy density of 202 W h kg(-1). This value is comparable to that of the lithium-ion batteries, i.e., 180 W h kg(-1). 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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