Journal of the Ceramic Society of Japan
Online ISSN : 1348-6535
Print ISSN : 1882-0743
ISSN-L : 1348-6535
Technical report
Hydrothermal synthesis and electrochemical capacitor application of urchin-like NiCo2O4 particles: effect of urea concentrations
Kazuki FUKUIYuya NAKAMURAHiroya ABEYoshikazu SUZUKI
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2019 Volume 127 Issue 11 Pages 843-848

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Abstract

NiCo2O4-based materials are promising for high-performance energy storage materials. Here, we report the synthesis of urchin-like NiCo2O4 particles via the hydrothermal urea precipitation process, and studied the effect of urea concentrations on phase purity, microstructure, and electrochemical capacitor performance. NiCl2·6H2O, CoCl2·6H2O and urea, were weighed as Ni:Co:urea = 1:2:[5, 10 or 15] in molar fraction, and they were dissolved in distilled water and hydrothermally heated at 140°C for 6 h. The three precursors were calcined at 350°C for 3 h in air atmosphere. The three products were mainly composed of 3–10 µm sized urchin-like particles. All the final samples had 5–20 nm sized mesopores and ∼50–70 m2/g of specific surface area, but the distributions of Ni and Co in the urchin-like particles were affected by the starting urea concentration. The sample of single-phase NiCo2O4 from Ni:Co:urea = 1:2:15 showed the best electrochemical capacitor performance among the three urea concentrations.

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© 2019 The Ceramic Society of Japan
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