期刊
JOURNAL OF ENERGY STORAGE
卷 33, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.est.2020.102088
关键词
Co-Fe LDHs; Three-dimensional structure; Hydrothermal synthesis; Electrode materials; Binder-free
资金
- National Natural Science Foundation of China [61761047, 41876055]
- Project of the Department of Education of Yunnan Province
- Program for Innovative Research Team (in Science and Technology) in University of Yunnan Province
- Project of the Department of Education of Yunnan Province [2020J0015, 2020Y0022]
The electrode with multi-sized nanosheets Co-Fe LDHs grown on Ni foam demonstrated great specific capacitance and good cycling stability. The unique three-dimensional structure and Ni foam as conductive skeleton contributed to the improved performance of supercapacitor electrodes.
To improve the electrochemical performance and overcome the disadvantages of layered double hydroxides (LDHs), designing the three-dimensional structure may be an effective way. Based on this strategy, we successfully synthesized multi-sized nanosheets cobalt-iron layered double hydroxides (Co-Fe LDHs) on Ni foam by a facile hydrothermal reaction. The poor conductivity of LDHs can be improved by directly grown on Ni foam which can be used as conductive skeleton. The sample has a unique three-dimensional structure with multi-sized nanosheets observed from scanning electron microscopy (SEM) and transmission electron microscopy (TEM) images. The elements and structure are confirmed by X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The electrodes show a great specific capacitance of 3340 mF cm(-2) (1670 C cm(-2)) at 1 mA cm(-2) and good cycling stability which keeps the capacitance retention at 85.1% after 4000 cycles. The improved performances may be due to the unique structure with multi-sized nanosheets and the Ni foam used as conductive skeleton to reduce agglomeration and strengthen conductivity. The results indicate the Co-Fe LDHs grown on Ni Foam have a promising future as supercapacitor electrodes.
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