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Title: 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 attributedmore » 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.« less
Authors:
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Publication Date:
OSTI Identifier:
22348589
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Research Bulletin; Journal Volume: 51; Other Information: Copyright (c) 2013 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 77 NANOSCIENCE AND NANOTECHNOLOGY; CARBON; COBALT OXIDES; DIRECT CURRENT; ENERGY STORAGE; HYDROTHERMAL SYNTHESIS; LITHIUM; LITHIUM IONS; NANOSTRUCTURES; NICKEL; SPUTTERING; STABILITY; SUBSTRATES