Li Ruchun, Hu Zhaoxia, Shao Xiaofeng, Cheng Pengpeng, Li Shoushou, Yu Wendan, Lin Worong, Yuan Dingsheng
Department of Chemistry, Jinan University, Guangzhou 510632, PR China.
Sci Rep. 2016 Jan 12;6:18737. doi: 10.1038/srep18737.
We report a new environmentally-friendly synthetic strategy for large-scale preparation of 16 nm-ultrathin NiCo based layered double hydroxides (LDH). The Ni50Co50-LDH electrode exhibited excellent specific capacitance of 1537 F g(-1) at 0.5 A g(-1) and 1181 F g(-1) even at current density as high as 10 A g(-1), which 50% cobalt doped enhances the electrical conductivity and porous and ultrathin structure is helpful with electrolyte diffusion to improve the material utilization. An asymmetric ultracapacitor was assembled with the N-doped graphitic ordered mesoporous carbon as negative electrode and the NiCo LDH as positive electrode. The device achieves a high energy density of 33.7 Wh kg(-1) (at power density of 551 W kg(-1)) with a 1.5 V operating voltage.
我们报道了一种用于大规模制备16纳米超薄镍钴基层状双氢氧化物（LDH）的新型环保合成策略。Ni50Co50-LDH电极在0.5 A g(-1)时表现出1537 F g(-1)的优异比电容，即使在高达10 A g(-1)的电流密度下也有1181 F g(-1)，其中50%的钴掺杂提高了电导率，多孔和超薄结构有助于电解质扩散以提高材料利用率。用氮掺杂的石墨有序介孔碳作为负极，镍钴LDH作为正极组装了一个不对称超级电容器。该器件在1.5 V工作电压下实现了33.7 Wh kg(-1)的高能量密度（在功率密度为551 W kg(-1)时）。
