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- Title
Ultrathin Co<sub>3</sub>O<sub>4</sub> nanosheet arrays with high supercapacitive performance.
- Authors
Qiu Yang; Zhiyi Lu; Xiaoming Sun; Junfeng Liu
- Abstract
Constructing nanostructures with desirable morphology and size is a critical issue for pursuing high performance electrode materials. Ultrathin Co3O4 nanosheet arrays∼ which are composed of well aligned uniform long-range (∼5 μm in length) and thin (∼10 nm in thickness) nanosheets∼ with reasonable mass loading on Ni foam are prepared by a two-step hydrothermal reaction. As a supercapacitor electrode∼ a superior specific capacitance (∼1782 F g-1) is obtained at current density of 1.8 A g-1 (5 mA cm-2)∼ much larger than that of the thicker nanostrucutures (∼300 F g-1). The ultrathin nanosheet arrays electrode exhibits good rate capabilities∼ maintaining 51% of the initial capacity at current density of 30 mAcm22∼ and excellent long-term stability∼ remaining .90% of capacitance after 2000 cycles. Such high performance is attributed to the desirable morphologies∼ uniform architecture and high surface area. The results manifest that ultrathin Co3O4 nanosheet arrays are promising electrode material for supercapacitor in future application.
- Subjects
NANOSTRUCTURES; ELECTRICAL conductors; ELECTRIC resistors; HYDROTHERMAL electric power systems; SUPERCAPACITOR electrodes; ELECTRIC power conversion
- Publication
Scientific Reports, 2013, p1
- ISSN
2045-2322
- Publication type
Article
- DOI
10.1038/srep03537