Ethanol-assisted hydrothermal synthesis and electrochemical properties of coral-like {beta}-Co(OH){sub 2} nanostructures

Journal Article · Wed Sep 15 00:00:00 EDT 2010 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2010.07.030· OSTI ID:21432483

Shaochun, Tang; Vongehr, Sascha; Yang, Wang; Lan, Chen ^[1]

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1. National Laboratory of Solid State Microstructures, Department of Materials Science and Engineering, Nanjing University, Nanjing 210093 (China)

Highly uniform, porous {beta}-Co(OH){sub 2} nanostructures with an appearance reminding of certain spherical corals were synthesized via a facile, one-step hydrothermal route using ethanol-water mixtures as solvents. The rough surfaces of the nanostructures consist of numerous randomly distributed, interconnecting nanoflakes, resulting in a network-like structure with many cavities. The coral-like product has a high Brunauer-Emmet-Teller specific surface area of 163 m{sup 2}/g. The diameter of the coral-like {beta}-Co(OH){sub 2} nanostructures is adjustable from 800 nm to 2 {mu}m. The effects of the ethanol/water ratio, the Co{sup 2+} concentration, the hydrothermal temperature, and the reaction time on the formation of the coral-like structures were investigated. Cyclic voltammetry and galvanostatic charge-discharge tests show that the {beta}-Co(OH){sub 2} possesses excellent capacitive properties. This is mainly attributed to the high porosity, which allows a deep penetration by electrolytes. - Abstract: Coral-like {beta}-Co(OH){sub 2} nanostructures were synthesized via a facile ethanol-assisted hydrothermal route. Their high porosity facilitates a deep penetration by electrolytes and thus contributes to the excellent capacitive properties.

• OSTI ID: 21432483
• Journal Information: Journal of Solid State Chemistry, Vol. 183, Issue 9; Other Information: DOI: 10.1016/j.jssc.2010.07.030; PII: S0022-4596(10)00312-9; Copyright (c) 2010 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

77 NANOSCIENCE AND NANOTECHNOLOGY
COBALT HYDROXIDES
COBALT IONS
ELECTROCHEMISTRY
ETHANOL
HYDROTHERMAL SYNTHESIS
NANOSTRUCTURES
POROSITY
POROUS MATERIALS
SPECIFIC SURFACE AREA
VOLTAMETRY
ALCOHOLS
CHARGED PARTICLES
CHEMISTRY
COBALT COMPOUNDS
HYDROGEN COMPOUNDS
HYDROXIDES
HYDROXY COMPOUNDS
IONS
MATERIALS
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SYNTHESIS
TRANSITION ELEMENT COMPOUNDS