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; X. B. Zhang

doi:10.1039/c3ra41351a

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, X. B. Zhang

^*Corresponding author for this work

Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

13 Scopus citations

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 L ^-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 L^-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.

Original language	English (US)
Pages (from-to)	13304-13310
Number of pages	7
Journal	RSC Advances
Volume	3
Issue number	32
DOIs	https://doi.org/10.1039/c3ra41351a
State	Published - Aug 28 2013

ASJC Scopus subject areas

General Chemistry
General Chemical Engineering

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

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 L -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 L-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.",

author = "Cheng, {J. P.} and M. Li and Zhang, {W. F.} and Wu, {J. S.} and F. Liu and Zhang, {X. B.}",

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T1 - Evolution of cobalt hydroxide from 2D microplatelets to a 3D hierarchical structure mediated by precursor concentration

AU - Cheng, J. P.

AU - Li, M.

AU - Zhang, W. F.

AU - Wu, J. S.

AU - Liu, F.

AU - Zhang, X. B.

PY - 2013/8/28

Y1 - 2013/8/28

N2 - 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 L -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 L-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.

AB - 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 L -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 L-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.

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DO - 10.1039/c3ra41351a

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JO - RSC Advances

JF - RSC Advances

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ER -

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

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