Journal
ELECTROCHIMICA ACTA
Volume 327, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2019.134970
Keywords
Hollow structure; Hybrid supercapacitor; Urchin-like; Bimetal TMH
Categories
Funding
- National Natural Science Foundation of China [51672186]
- Nanchang University and Arizona State University
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Developing novel nanostructures is always the most decisive aspect for high-performance supercapacitor electrodes. Thus, a facile one-step and self-templated method is successfully developed for the fabrication of urchin-like Ni2Co(CO3)(2)(OH)(2) hollow microspheres (NiCoHSs) as a high-performance hybrid supercapacitor electrodes. The synthesis conditions are carefully adjusted and the mechanisms of morphology transformation are clearly illustrated. The favorable morphology with a large specific surface area, suitable pore sizes, and good conductivity endows a high specific capacity (890.8 C g(-1 )at 0.5 A g(-1)) and excellent rate retention (700.8 C g(-1) at 50 A g(-1)), and high stability (87.5% over 5000 cycles), which outperforms most reported electrodes based on nickel-cobalt oxides/hydroxides. Contributed by the uniquely engineered electrodes, a high-performance hybrid supercapacitor (HCS) is assembled, which exhibited a high specific capacity of 256.9 C g(-1) (160.5 Fg(-1)) at 0.5 A g(-1) with an operating voltage of 1.6 V and an outstanding energy density of 57.1 W h kg(-1 )at a power density of 400.0 W kg(-1). This work offers a facile self-templated method to fabricate bimetal Transition-metal oxides (TMOs) electrodes for hybrid supercapacitors. (C) 2019 Elsevier Ltd. All rights reserved.
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