超级电容器
材料科学
多孔性
化学工程
电流密度
氢氧化物
电子转移
碳纤维
活性炭
功率密度
三聚氰胺
碳纳米泡沫
电极
电容
复合材料
纳米技术
化学
复合数
有机化学
物理化学
功率(物理)
吸附
量子力学
工程类
物理
作者
Yuexin Liu,Yanzhong Wang,Chenjing Shi,Yanjun Chen,Dan Li,Zhenfeng He,Chao Wang,Li Guo,Jianmin Ma
出处
期刊:Carbon
[Elsevier]
日期:2020-09-01
卷期号:165: 129-138
被引量:196
标识
DOI:10.1016/j.carbon.2020.04.084
摘要
The three-dimensional (3D) interconnected structure is desirable for high-performance supercapacitor since it can provide more exposed electroactive sites as well as accelerate the electron and ion transfer. Herein, nitrogen doped carbon foams with good hydrophilicity and mechanical property are first prepared from cheap melamine foams via the heat-treatment at low temperature in the air, which can serve as an ideal substrate for growing nickel cobalt layered double hydroxide nanosheets (NiCo-LDH) derived from cobalt zeolitic imidazole frameworks (Co-ZIF). The as-prepared NiCo-LDH/N doped carbon foam (NiCo-LDH/NCF) exhibits high specific capacity of 756 C g−1 at a current density of 0.5 A g−1, and still retains the specific capacity of 414 C g−1 at a current density of 20 A g−1, indicating the excellent rate capability. Furthermore, the assembled [email protected]//activated carbon asymmetrical supercapacitor device achieves a high energy density of 41.5 Wh kg−1 at a power density of 750 W kg−1, and an excellent cyclic stability of 80.4% retention over 10000 cycles. The remarkable capacitive performance of [email protected] is assigned to the self-supporting 3D interconnected architecture of NCF that makes the uniform distribution of NiCo-LDH nanosheets and also provides the rapid channels for electron and ion transfer. The results indicate that [email protected] will be a promising candidate for high-performance supercapacitors.
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