Hydrothermal synthesis and electrochemical capacitor application of urchin-like NiCo<sub>2</sub>O<sub>4</sub> particles: effect of urea concentrations

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  • FUKUI Kazuki
    Graduate School of Pure and Applied Sciences, University of Tsukuba
  • NAKAMURA Yuya
    Graduate School of Pure and Applied Sciences, University of Tsukuba
  • ABE Hiroya
    Joining and Welding Research Institute, Osaka University
  • SUZUKI Yoshikazu
    Graduate School of Pure and Applied Sciences, University of Tsukuba Faculty of Pure and Applied Sciences, University of Tsukuba

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Abstract

<p>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.</p>

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