Original LINK at ACS

Jun Song Chen†, Ting Zhu†, Qiu Hong Hu‡, Junjie Gao§, Fabing Su§, Shi Zhang Qiao‡, and Xiong Wen Lou†

School of Chemical and Biomedical Engineering, Nanyang Technological University, 70 Nanyang Drive, Singapore 637457, Singapore, ARC Centre of Excellence for Functional Nanomaterials, The University of Queensland, Level 5W, AIBN (Building 75), Brisbane, Queensland 4072, Australia, and State Key Laboratory of Multiphase Complex System, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, China 100190

ACS Appl. Mater. Interfaces, 2010, 2 (12), pp 3628–3635 DOI : 10.1021/am100787w Publication Date (Web): November 18, 2010 Copyright © 2010 American Chemical Society Corresponding author. E-mail: s.qiao@uq.edu.au (S.Z.Q.); xwlou@ntu.edu.sg (X.W.L.)., † Nanyang Technological University., ‡ The University of Queensland., § Chinese Academy of Sciences.

Cite this: ACS Appl. Mater. Interfaces 2010, 2, 12, 3628-3635

Abstract

Facile hydrothermal methods have been developed to synthesize large Co3O4 nanocubes, β-Co(OH)2 hexagonal nanodiscs and nanoflowers. Samples are thoroughly characterized by field-emission scanning electron microscopy, transmission electron microscopy, X-ray diffraction, Brunauer−Emmett−Teller method, and thermogravimetric analysis. The Co3O4 nanocubes have an average size of about 350 nm with a perfect cubic shape, and the β-Co(OH)2 nanodiscs are uniform hexagonal platelets, whereas the β-Co(OH)2 nanoflowers are assembled from large sheetlike subunits. After thermal annealing in air at a moderate temperature, the as-prepared β-Co(OH)2 samples can be converted into spinel Co3O4 without significant alterations in morphology. We have also investigated the comparative lithium storage properties of these three Co3O4 samples with distinct morphologies. The nanoflower sample shows highly reversible lithium storage capability after 100 charge−discharge cycles.

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