期刊
INDUSTRIAL CROPS AND PRODUCTS
卷 171, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.indcrop.2021.113900
关键词
Activated carbon fiber; NiCo-LDH; Microwave-assisted hydrothermal; Core-shell structure; Supercapacitor
资金
- National Natural Science Foundation of China [31971593]
- Natural Science Foundation of Fujian Province Department of Science and Technology [2019J01386]
- Science and Technology Innovation Project of Fujian Agriculture and Forestry University [CXZX2019103]
- Undergraduate Innovation Program of Fujian Agriculture and Forestry University [201910389238]
Activated carbon fiber (ACF) from Chinese fir wood powder by melt-spinning was used to prepare a NiCo-LDH@ACF composite material via a microwave-assisted synthesis method, which shows great potential as electrode materials for energy storage devices. The Ni1Co1-LDH@ACF composite exhibits the largest specific capacitance and high rate performance at a molar ratio of Ni2+/Co2+ of 1:1. Moreover, the assembled asymmetric supercapacitor device with NiCo-LDH@ACF composites and fir bark-based activated carbons demonstrates superior energy density and cycle life.
Activated carbon fiber (ACF) from Chinese fir wood powder by melt-spinning was used to prepare a NiCo-LDH@ACF composite material via a microwave-assisted synthesis method, which contained two-dimensional nanosheets and sea urchin-like microspheres with a core-shell structure. Regulating the proportion of Ni2+ and Co2+ in NiCo-LDH@ACF can significantly change the apparent morphology, hierarchical porosity and active sites, thereby affecting the electrochemical performance. When the molar ratio of Ni2+/Co2+ is 1:1, Ni1Co1-LDH@ACF has the largest specific capacitance of 1453 F/g and a very high rate performance of 78 % at 10 A/g. In addition, asymmetric supercapacitors are assembled using NiCo-LDH@ACF composites as the positive electrode and fir bark-based activated carbons as the negative electrode material. The assembled asymmetric supercapacitor device possesses a high specific capacitance of 147 F/g at 1 A/g, superior energy density of 52.2 Wh/kg at 800 W/kg and an incredible cycle life of 79.8 % after 10,000 cycles. All these results suggest that NiCo-LDH@ACF composites have great potential as electrode materials for energy storage devices that benefit from the synergistic effect of both the NiCo-LDH and carbon materials of the ACFs.
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