School of Chemical Engineering, Dalian University of Technology, Panjin 124221, China.State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116023, China..
School of Chemical Engineering, Dalian University of Technology, Panjin 124221, China.State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116023, China.
J Colloid Interface Sci. 2022 Jan 15;606(Pt 2):1120-1127. doi: 10.1016/j.jcis.2021.08.094. Epub 2021 Aug 18.
Layered double hydroxides (LDHs) have been considered as favorable pseudocapacitive electrode materials for supercapacitors due to their tunable layered structure/compositions and low cost. Here, we report the NiCo-LDH hollow spheres prepared with Co-glycerate as the sacrificial template and cobalt source. The hollow spheres are assembled with frizzy NiCo-LDH nanosheets, where the hollow structure can inhibit agglomeration of the LDH nanosheets to expose more active sites and shorten the diffusion path of electrolyte ions. The prepared NiCo-LDH hollow spheres show a high specific capacitance of 1962 F g at 1 A g and good capacitance retention rate of 66.4 % at 30 A g. The asymmetric supercapacitors fabricated using NiCo-LDH hollow spheres as positive electrode yields a large energy density 62.9 Wh kg at the power density of 0.8 kW kg. This research may develop a facile synthesis way to prepare LDH hollow spheres for supercapacitors.
层状双氢氧化物 (LDHs) 因其可调的层状结构/组成和低成本而被认为是超级电容器的理想赝电容电极材料。在这里，我们报告了使用 Co-甘油酸盐作为牺牲模板和钴源制备的 NiCo-LDH 空心球。空心球由卷曲的 NiCo-LDH 纳米片组装而成，其中空心结构可以抑制 LDH 纳米片的团聚，从而暴露更多的活性位点并缩短电解质离子的扩散路径。所制备的 NiCo-LDH 空心球在 1 A g 时表现出 1962 F g 的高比电容，在 30 A g 时具有 66.4%的良好电容保持率。使用 NiCo-LDH 空心球作为正极制备的非对称超级电容器在 0.8 kW kg 的功率密度下产生 62.9 Wh kg 的大能量密度。这项研究可能为超级电容器开发出一种简便的 LDH 空心球制备方法。
