期刊
NANO LETTERS
卷 17, 期 5, 页码 3097-3104出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.7b00533
关键词
Multiscale pore networks; chitosan; carbon; ultrafast charging supercapacitors
类别
资金
- Jiangsu Government Scholarship for overseas studies
- National Natural Science Foundation of China [11204266, 21276220]
- Natural Science Foundation of Jiangsu Province [BK20141262, BK20140463]
- U.S. NSF MRI Grant [MRI-1126845]
- University of California, Santa Cruz
- National Aeronautics and Space Administration (NASA) [NNX15AQ01]
Increasing charge storage capability during fast charging (at ultrahigh current densities) has been a long-standing challenge for supercapacitors. In this work, a novel porous carbon foam electrode with multiscale pore network is reported that achieves a remarkable gravimetric capacitance of 374.7 +/- 7.7 F g(-1) at a current density of 1 A g(-1). More importantly, it retains 235.9 +/- 7.5 F g(-1) (60% of its capacitance at 1 A g(-1)) at an ultrahigh current density of 500 A g(-1). Electron microscopy studies reveal that this carbon structure contains multiscale pores assembled in a hierarchical pattern. The outstanding capacitive performance benefits from its extremely large surface area of 2905 m2 g(-1), as around 88% of the electric charges are stored via electrical double layer. Significantly, electrochemical analyses show that the hierarchical porous structure containing macro-, meso-, and micropores allows efficient ion diffusion and charge transfer, resulting in the excellent rate capability. The findings pave the way for improving rate capability of supercapacitors and enhancing their capacitances at ultrahigh current densities.
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