Issue 32, 2013
From the journal:

RSC Advances

Evolution of cobalt hydroxide from 2D microplatelets to a 3D hierarchical structure mediated by precursor concentration†

J. P. Cheng,*ab   M. Li,a   W. F. Zhang,a   J. S. Wu,*b   F. Liua  and  X. B. Zhanga  

* Corresponding authors

a Department of Materials Science and Engineering, State Key Laboratory of Silicon Materials, Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang Province, Zhejiang University, Hangzhou, 310027, P. R. China

b Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois, 60208, USA
E-mail: chengjp@zju.edu.cn, jinsong-wu@northwestern.edu
Fax: +86-571-87951411
Tel: +86-571-87951411

Abstract

We presented a facile and surfactant free approach to prepare 3-dimensional (3D) hierarchical Co(OH)2 with enhanced specific capacitance. The hierarchical Co(OH)2 was synthesized by a simple reaction of cobalt nitrate and ammonia solution with an appropriate concentration of the precursor. The effects of cobalt nitrate concentration on the crystal morphology were studied. When the concentration of cobalt nitrate was as low as 0.05 mol Lāˆ’1, 2-dimensional (2D) hexagonally shaped (001) Co(OH)2 microplatelets were formed. As the concentration of the cobalt precursor was increased to 0.1 mol Lāˆ’1, 3D hierarchical Co(OH)2 structures with nano-sized nanorods vertically assembled on the hexagonal microplatelets formed. Electrochemical tests showed that the hierarchical Co(OH)2 had a much higher specific capacitance than that of the Co(OH)2 microplatelets. This was mainly due to the increased number of pores in the hierarchical Co(OH)2 structure.

Graphical abstract: Evolution of cobalt hydroxide from 2D microplatelets to a 3D hierarchical structure mediated by precursor concentration

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Article information

DOI
https://doi.org/10.1039/C3RA41351A
Article type
Paper
Submitted
19 Mar 2013
Accepted
16 May 2013
First published
21 May 2013

RSC Adv., 2013,3, 13304-13310

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Evolution of cobalt hydroxide from 2D microplatelets to a 3D hierarchical structure mediated by precursor concentration

J. P. Cheng, M. Li, W. F. Zhang, J. S. Wu, F. Liu and X. B. Zhang, RSC Adv., 2013, 3, 13304 DOI: 10.1039/C3RA41351A

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