Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1558245 | New Carbon Materials | 2016 | 8 Pages |
Abstract
A high performance asymmetric supercapacitor was fabricated using a CoNi-layered double hydroxide (CoNi-LDH) as the positive electrode and activated carbon as the negative electrode in an electrolyte of 6 M aqueous KOH. The supercapacitor can be cycled reversibly in a wide potential window of 0-1.5 V and exhibits a remarkable energy density of 46.3 Wh·kgâ1 at a power density of 102.3 W·kgâ1, a high energy density of 25.6 Wh·kgâ1 even at a high power density of 1704.5 W·kgâ1 These values are much higher than those of a symmetric supercapacitor using only activated carbon (6.9 Wh·kgâ1). The results can be ascribed to the high specific capacitance and rate capability of the CoNi-LDH, and the complementary potential windows of the two electrodes that increase the working voltage of the supercapacitor. The supercapacitor also exhibits stable cycling with a 84.5% capacitance retention after 1000 cycles.
Related Topics
Physical Sciences and Engineering
Materials Science
Materials Chemistry
Authors
Li-jing Xie, Guo-hua Sun, Long-fei Xie, Fang-yuan Su, Xiao-ming Li, Zhuo Liu, Qing-qiang Kong, Chun-xiang Lu, Kai-xi Li, Cheng-meng Chen,