Sun Fancheng, Chen Tingting, Li Qing, Pang Huan
School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225009, Jiangsu, PR China.
School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225009, Jiangsu, PR China; Guangling College, Yangzhou University, Yangzhou 225009, Jiangsu, PR China.
J Colloid Interface Sci. 2022 Dec;627:483-491. doi: 10.1016/j.jcis.2022.07.053. Epub 2022 Jul 16.
Hierarchical superstructures in nano/microsize can provide improved transport of ions, large surface area, and highly robust structure for electrochemical applications. Herein, a facile solution precipitation method is presented for synthesizing a hierarchical nickel oxalate (Ni-OA) superstructure composed of 1D nanorods under the control of mixed solvent and surfactant of sodium dodecyl sulfate (SDS). The growth process of the hierarchical Ni-OA superstructure was studied and indicated that the product had good stability in mixed solvent. Owing to smaller size, shorter pathway of ion diffusion, and abundant interfacial contact with electrolytes, hierarchical Ni-OA superstructure (Ni-OA-3) showed higher specific capacity than aggregated micro-cuboids (Ni-OA-1) and self-assembled micro/nanorods (Ni-OA-2). Moreover, the assembled Ni-OA-3//Zn battery showed good cyclic stability in aqueous electrolytes, and achieved a maximum energy density of 0.42 mWh cm (138.75 Wh kg), and a peak power density of 5.36 mW cm (1.79 kW kg). This work may provide a new idea for the investigation of hierarchical nickel oxalate-based materials for electrochemical energy storage.
纳米/微米级的分级超结构可为电化学应用提供改善的离子传输、大表面积和高度稳健的结构。在此，本文提出了一种简便的溶液沉淀法，用于在十二烷基硫酸钠（SDS）的混合溶剂和表面活性剂的控制下合成由一维纳米棒组成的分级草酸镍（Ni-OA）超结构。研究了分级Ni-OA超结构的生长过程，结果表明该产物在混合溶剂中具有良好的稳定性。由于尺寸更小、离子扩散路径更短以及与电解质的界面接触丰富，分级Ni-OA超结构（Ni-OA-3）显示出比聚集的微立方体（Ni-OA-1）和自组装的微/纳米棒（Ni-OA-2）更高的比容量。此外，组装的Ni-OA-3//Zn电池在水性电解质中显示出良好的循环稳定性，实现了0.42 mWh cm（138.75 Wh kg）的最大能量密度和5.36 mW cm（1.79 kW kg）的峰值功率密度。这项工作可能为研究用于电化学储能的分级草酸镍基材料提供新思路。
