Three-dimensional (3D) nanostructures have attracted considerable attention because of their high surface areas and unique properties which gives outstanding performance in catalysis and energy storage applications. This paper proposes the growth mechanism of 3D flower-like β-Ni(OH)2 constructed through a two dimensional sheet framework using a one-step oleylamine-assisted solvothermal approach, where oleylamine acts as the surfactant, co-solvent, stabilizer, and reducing agent. A detailed examination of the product morphology after various reaction times suggested that the self-assembly of flower occurs through a mechanism involving nucleation, Ostwald ripening, and recrystallization. The associated characterization revealed it to be pure β-Ni(OH)2 without any sign of contamination. The effect of the morphology (sheet to 3D flower-like β-Ni(OH)2) on the electrochemical supercapacitive behavior was assessed by cyclic voltammetry and galvanostatic charge-discharge tests. The results showed that 3D flower-like β-Ni(OH)2 exhibited better specific capacitance of ~1567 F g−1 at a current density of 1 A g−1 and retained ~25% capacitance at a high current density of 10 A g−1 compared to the other reference materials. The superior electrochemical properties of the 3D flower-like β-Ni(OH)2 originate from their large specific surface area and unique structure.
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机译：三维（3D）纳米结构因其高表面积和独特的性能而备受关注，在催化和能量存储应用中具有出色的性能。本文提出了一种通过二维片状框架通过一步油胺辅助溶剂热法构建3D花状β-Ni（OH）2的生长机理，其中油胺充当表面活性剂，助溶剂，稳定剂和还原剂。在各种反应时间之后，对产品形态的详细检查表明，花的自组装是通过涉及成核，奥斯特瓦尔德熟化和重结晶的机制发生的。相关的特征表明它是纯的β-Ni（OH）2，没有任何污染迹象。通过循环伏安法和恒电流充放电测试，评估了形态（3D花状β-Ni（OH）2薄片）对电化学超电容行为的影响。结果表明，在电流密度为1 A g -1 的情况下，3D花状β-Ni（OH）2表现出更好的比电容〜1567 F g -1 与其他参考材料相比，在10 A g -1 的高电流密度下可保持〜25％的电容。 3D花状β-Ni（OH）2的优异电化学性能源于其大的比表面积和独特的结构。
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