Constructing optimized three-dimensional electrochemical interface in carbon nanofiber/carbon nanotube hierarchical composites for high-energy-density supercapacitors
2019/11/27 21:19:28
Zhou, J. Y., J. Y. Chen, S. Han, H. Zhao, J. L. Bai, Z. Y. Yang, X. M. Mu, Y. Liu, D. M. Bian, G. Z. Sun, Z. X. Zhang, X. J. Pan and E. Q. Xie
It is demonstrated that the performances of supercapacitors are often affected by the electrochemical interface in their electrodes. In this work, the electrochemical interface in carbon nanofiber (CNF)/carbon nanotube (CNT) hierarchical composites was well optimized by tuning the diameters of electrospun CNF skeletons and the densities/lengths of CNT hierarchies. The optimized CNF/CNT composites decorated with MnO2 exhibited high specific capacitance (similar to 631.0 F g(-1) at current density of 0.9 A g(-1)) and excellent cycling stability (over 95% after 1500 cycles). Moreover, the assembled symmetric supercapacitors show a high flexibility and an excellent dynamic cycling stability, outputting the maximum energy density of 19.11 W h kg(-1) and the maximum power density reaching 25,000 W kg(-1). This research confirmed that the performances of the electrodes based on CNF/CNT hierarchical composites and their counterpart devices can be well tuned by tailoring their three-dimensional electrochemical interface. (C) 2016 Elsevier Ltd. All rights reserved.
- Journal: Carbon
- Volume: 111
- Issue:
- Pages: 502-512
- ISSN: 0008-6223
- DOI: 10.1016/j.carbon.2016.10.036
- Year: 2017
- Number:
- Type:
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