Issue 58, 2014

Controlled synthesis of porous Co3O4–C hybrid nanosheet arrays and their application in lithium ion batteries

Abstract

Two-dimensional Co3O4 nanostructures with porous architectures are experiencing rapid development in functional material fields for their unique structures and properties. Porous Co3O4–C hybrid nanosheet (NS) arrays grown directly on various conducting substrates are synthesized by a controlled method for the first time via a facile hydrothermal synthesis approach in combination with heat treatment. These NS arrays reveal uniform hexagonal morphology and have combined properties of quasi-single-crystallinity and a pore network inside the architecture. A four-step formation mechanism is proposed to understand the growth process of nanosheet arrays grown on the substrate based on the change of morphology. Both the concentration of Co2+ and poly(vinylpyrrolidone) (PVP) play key roles in the formation of NS arrays. When tested as an anode material in lithium-ion batteries, the porous Co3O4–C hybrid NS arrays exhibit improved electrochemical properties of cyclic performance and high coulombic efficiency compared with the commercial Co3O4 and Co3O4/carbon nanocomposites. This approach, porous Co3O4–C NS arrays grown directly on different substrates (wafer, foam, alloy net, foil, especially flexible carbon cloth), provides an efficient route to produce NS arrays to meet the demand for diversity, and may be extended to synthesize other transition metal oxide materials for other applications.

Graphical abstract: Controlled synthesis of porous Co3O4–C hybrid nanosheet arrays and their application in lithium ion batteries

Supplementary files

Article information

Article type
Paper
Submitted
10 May 2014
Accepted
23 Jun 2014
First published
24 Jun 2014

RSC Adv., 2014,4, 30573-30578

Author version available

Controlled synthesis of porous Co3O4–C hybrid nanosheet arrays and their application in lithium ion batteries

J. Wang, B. Gao, L. Zhang, R. Li, J. Shen, Z. Qiao, G. Yang and F. Nie, RSC Adv., 2014, 4, 30573 DOI: 10.1039/C4RA04352A

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