Journal
APPLIED SURFACE SCIENCE
Volume 511, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2020.145538
Keywords
One-pot; Reduced graphene oxide; NiCo2O4; Synergistic effect; Ultrahigh specific capacitance; Large current density
Categories
Funding
- National Natural Science Foundation of China [21271027]
Ask authors/readers for more resources
As an energy storage and conversion device, supercapacitor with fast charge/discharge rate needs higher capacitance and simpler preparation method. This work is to prepare a high-performance hybrid electrode material of cobalt acid nickel (NiCo2O4) and reduced graphene oxide (rGO) on nickel foam (NF) substrate (named as NiCo2O4/rGO/NF) by a simple one-pot hydrothermal method. The hybrid electrode materials without using any binder to avoid dead surface, which can exert the synergistic effect of graphene and NiCo2O4. The NiCo2O4/rGO/NF composite electrode shows ultrahigh specific capacitance of 2682.6 F/g (2.41 F/cm(2)) at 1 A/g, even at a larger current density of 30 A/g the capacitance retention rate is still up 80%, which shows its outstanding rate capability. Moreover, the cycling stability WA exhibits the specific capacitance can retain 75% after 10,000 cycles at 50 A/g. Furthermore, a symmetric supercapacitor device based on NiCo2O4/rGO/NF electrode is assembled, delivering a high specific capacitance 291.5 F/g at 0.5 A/g, high energy density (58.3 Wh/kg), high power density (12 kW/kg at 35 Wh/kg), and 180% capacitance retention after 14,000 charge/discharge cycles at 10 A/g. The facile synthesis method and excellent performance of NiCo2O4/rGO/NF hybrid electrode provide a broader application prospect in the field of new energy.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available