The Plate-Like Hexagonal Ni-Fe-Sr Layered Double Hydroxides as Advanced Electrodes for Electrochemical Energy Storage
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Some kinds of the plate-like hexagonal layered double complex hydroxides (named Ni-Fe-Sr-LDHs) materials were prepared for energy storage electrodes in this work. It showed good properties with energy densities and cycle life through the electrochemical tests. At 1 A g−1 current density, the specific capacitance of the electrode reached 311.02 F g−1 when the electrolyte was 6 M LiOH. In the long cycle test, the capacitance retention of the electrode maintained at 73.16% after 2000 cycles (current density: 1 A g−1). The morphologies of Ni-Fe-Sr-LDHs were characterized via the scanning electron microscope, transmission electron microscopy and x-ray powder diffraction. The prepared layered double hydroxides were further optimized by doping carbon nanotubes (CNTs). The optimal weight ratio of Ni-Fe-Sr-LDHs to CNTs was 3:1. The specific capacitance in the measurement of galvanostatic charge–discharge increased to 438.74 F g−1, and the stability of long-term cycling was raised to 77.45%. These results indicated that Ni-Fe-Sr-LDHs combined with CNTs would be an ideal electrode material for practical energy storage.
KeywordsEnergy storage electrode material electrochemical layered double hydroxide optimization
- A g−1
Electrochemical impedance spectroscopy
- F g−1
Average specific capacitance
Layered double hydroxides
- mV s−1
Saturated calomel electrode
Scanning electron microscope
Transmission electron microscope
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This research was supported by the National Key R&D Plan (No. 2017YFC0210202-1) and the Fundamental Research Funds for the Central Universities of China (No. 2015ZZD3).
- 2.L. Song, Y. Han, F. Guo, Y. Jiao, Y. Li, Y. Liu, and F. Gao, J. NanoMater. 9813203, 13 (2018).Google Scholar
- 3.Y. Han, L. Li, Y. Liu, X. Li, X. Qi, and L. Song, J. NanoMater. 5078473, 10 (2018).Google Scholar
- 15.X. Li, H. Wu, C. Guan, A.M. Elshahawy, Y. Dong, S.J. Pennycook, and J. Wang, Small 15, 1803895 (2019).Google Scholar