Net-structured Co{sub 3}O{sub 4}/C nanosheet array with enhanced electrochemical performance toward lithium storage
Graphical abstract: - Highlights: • Co{sub 3}O{sub 4}/C nanosheet array on nickel foam was synthesized by hydrothermal method, followed by magnetron sputtering of a carbon layer. • The Co{sub 3}O{sub 4}/C nanosheet array electrode delivers an initial discharge capacity of 1340.4 mAh g{sup −1} at 0.1 C. • After 100 cycles, the capacity retention of the Co{sub 3}O{sub 4}/C is 88.8% of its initial discharge capacity. • The enhanced electrochemical performances are attributed to the porous nanosheet array and the thin carbon layer coated on Co{sub 3}O{sub 4} nanosheets. - Abstract: Freestanding Co{sub 3}O{sub 4}/C nanosheet array growing directly on nickel foam substrate was synthesized using a hydrothermal approach, followed by a direct current magnetron sputtering of a thin carbon layer. The Co{sub 3}O{sub 4} nanosheets with thicknesses of 10–20 nm are interconnected with each other, forming a highly open net-structure. The Co{sub 3}O{sub 4}/C nanosheet array electrode delivers an initial discharge capacity of 1340.4 mAh g{sup −1} at 0.1 C, and maintains a high specific capacity of 912.1 mAh g{sup −1} at room temperature and can still remain 88.8% of its initial discharge capacity at 55 °C at 1 C after 100 cycles. The enhanced electrochemical performances are attributed to the porous nanosheet array and the thin carbon layer coated on Co{sub 3}O{sub 4} nanosheets, which cannot only facilitate Li{sup +} and electron transportation in the electrode, but also improve its structure stability during cycling.
- OSTI ID:
- 22348589
- Journal Information:
- Materials Research Bulletin, Vol. 51; Other Information: Copyright (c) 2013 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0025-5408
- Country of Publication:
- United States
- Language:
- English
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