Journal
JOURNAL OF ENERGY STORAGE
Volume 47, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.est.2021.103616
Keywords
Asymmetric supercapacitor; Energy storage; Nanoneedles; Carbon nanosheets; Hydrothermal
Categories
Funding
- National Science Foundation of China [21664012, 21703173]
- Basic Scientific Research Innovation Team Project of Gansu Province [1606RJIA324]
- University Scientific Research Innovation Team of Gansu Province [2017C-04]
- Outstanding Youth Fund of Gansu Province [20JR5RA539]
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A novel high-performance asymmetric supercapacitor has been fabricated using cobalt manganese oxide nanoneedles as a positive electrode and hibiscus fruits-based carbon nanosheet as a negative electrode. The supercapacitor exhibits excellent energy density and cycling stability under high power density.
A novel high-performance asymmetric supercapacitor (ASC) has been fabricated based on the cobalt manganese oxide (Co2Mn3O8) nanoneedles as a positive electrode and the hibiscus fruits-based carbon nanosheet (HBFC) as a negative electrode. The Co2Mn3O8 nanoneedles are synthesized by employing a one-step hydrothermal procedure using nickel foam as a support framework for the nanoneedle growth. The Co2Mn3O8 sample shows a distinct urchin-like morphology structure consisting of uniform nanoneedle arrays. The HBFC is prepared by chemical activation of the hibiscus fruits biomass carbon precursor using NH4Cl and KOH activation reagents. The as-prepared Co2Mn3O8 nanoneedles exhibited the highest specific capacity of 238 mAh g(-1) at a current density of 1 A g(-1). Moreover, the novel Co2Mn3O8//HBFC ASC device assembled based on those electrode materials at a maximum operating potential of 1.7 V shows an excellent energy density of 24.3 Wh kg(-1) at a power density of 850 W kg(-1). Besides, long-term cycling stability of 91.7% capacitance retention after 10,000 cycles in 2 M KOH electrolyte.
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