Tang Jibin, Huang Wanxia, Lv Xiang, Shi Qiwu
College of Materials Science and Engineering, Sichuan University, Chengdu, 610065, People's Republic of China.
Nanotechnology. 2021 Feb 19;32(8):085604. doi: 10.1088/1361-6528/abc7d6.
In this work, rapid chemical precipitation assisted annealing method is used to prepare flower-like NiCoS. And the flower-like structure after polyethylene glycol (PEG) modification yields an excellent specific capacitance (2198.9 F g at 1 A g). And an asymmetric supercapacitor assembled with NiCoS (PEG-modified) and activated carbon (AC) shows an energy density of 38.2 Wh kg at 400 W kg, and outstanding stability (80% remained after 3000 cycles at 5 A g). Benefited by a larger specific surface area and suitable pore size of the aggregate structure, the specific capacitance of prepared NiCoS is increased by about 2 times. This uncomplicated preparation method is proved to be suitable for NiCoS with a high specific capacitance of supercapacitors.
在本工作中，采用快速化学沉淀辅助退火法制备了花状NiCoS。经聚乙二醇（PEG）改性后的花状结构具有优异的比电容（在1 A g时为2198.9 F g）。用NiCoS（PEG改性）和活性炭（AC）组装的不对称超级电容器在400 W kg时的能量密度为38.2 Wh kg，且具有出色的稳定性（在5 A g下3000次循环后仍保留80%）。得益于聚集体结构较大的比表面积和合适的孔径，制备的NiCoS的比电容提高了约2倍。这种简单的制备方法被证明适用于具有高比电容的超级电容器用NiCoS。
