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Electrochemical Capacitance Performance of One-dimensional Nano-α-Co(OH)2 Employing Cobalt-cholate Supramolecular Nanofibers Self-template Method

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Author(s): CAI Long-Cheng, LI Juan, HUANG Jian-Bin

Journal: Journal of Inorganic Materials
ISSN 1000-324X

Volume: 28;
Issue: 7;
Start page: 739;
Date: 2013;
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Keywords: self-Template; α-Co(OH)2; electrochemical capacitance

ABSTRACT
Nano-α-Co(OH)2 was prepared via a facile strategy, in which the cobalt-cholate self-assembled spramolecular nanofibers as self-template were obtained by mixing sodium cholate solution with cobalt nitrate solution, and then the samples were obtained by adding depositing reagents NH3•H2O under ambient conditions. The composition and microstructure of the as-prepared samples were investigated by X-ray diffraction (XRD), infrared spectroscope (FT-IR), scanning electron microscope (SEM) and transmission electron microscope (TEM). The results indicate that the as-prepared materials are pure phase α-Co(OH)2 with one-dimensional nanofiber crossing loose network–like struture whose diameter is 100-200 nm. The electrochemical capacitive properties of the products were investigated using cyclic voltammetry and impedance spectroscopy in 6 mol/L KOH aqueous solution. The specific capacitance is up to 1200 F/g at a constant current charge/discharge test of 1 A/g within 0-0.5 V potential region, and stably keep 75% of initial capacitance after over 800 charge-discharge cycles. Its special nanostructure, with fast electrochemical response property, allows easy penetration of electrolyte and effective utilization of electrode material. This self-templating approach is therefore believed to provide a simple and convenient route to fabricate nanomaterials for application in supercapacitors.
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