Journal
ACS APPLIED MATERIALS & INTERFACES
Volume -, Issue -, Pages -Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.2c08546
Keywords
transition metal hydroxides; nano-core-shell structure; Cu7KS4@Ni0175Co0.25(OH); asymmetric supercapacitors; energy density; power density
Funding
- National Natural Science Foundation of China [21805124]
- Natural Science Foundation of Shandong Province [ZR2018BEM020]
- Shandong Double Hundred Foreign Experts Program
Ask authors/readers for more resources
Reasonable design of materials with complex nanostructures and diverse chemical compositions is significant in the field of energy storage. By a one-step hydrothermal reaction, binary metal hydroxide nanosheets were directly generated on Cu7KS4 nanorods to form a nano-core-shell structure, leading to improved specific capacitance and cycle life of supercapacitors.
Reasonable design of materials with complex nanostructures and diverse chemical compositions is of great significance in the field of energy storage. Cu7KS4 (CKS) is considered a potential electrode material for supercapacitors due to its superior electrical conductivity. Transition metal hydroxides are widely used as electrode materials for supercapacitors due to their high theoretical specific capacitance (C-s); however, single metal species with limited active sites restrict their further applications for energy storage. Herein, through a hydrothermal reaction, CKS nanorods were prepared, and then binary metal hydroxide NixCo1-x(OH)(2 )nanosheets were generated directly on CKS nanorods through a one-step hydrothermal reaction to form a nano-core-shell structure (NCSS). By regulating the mole ratio of nickel nitrate to cobalt nitrate, the resulting Ni0.75Co0.25(OH)(2) nanosheets with the best electrochemical activity were prepared and supported on CKS nanorods to form a CKS@N0.75C0.25OH NCSS. The as-prepared CKS@ N0.75C0.25OH NCSS has a larger specific surface area, which can provide more active sites, while the abundant metal species composition can generate abundant redox reactions to boost the pseudocapacitance. The prepared CKS@N0.75C0.25OH/NF electrode exhibits outstanding specific capacitance and cycle life. The assembled CKS@ N0.75C0.25OH/NF//AC all-solid-state asymmetric supercapacitor achieves a high energy density of 88.7 Wh kg(-1) at a power density of 849.9 W kg(-1) with superior cycle life. Therefore, the use of polymetallic hydroxides to construct NCSS electrodes has great research significance and broad application prospects.
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