Hierarchical nanothorns MnCo2O4 grown on porous/dense Ni bi-layers coated Cu wire current collectors for high performance flexible solid-state fiber supercapacitors
- Resource Type
- Authors
- Xie Jinqi; Yaqiang Ji; Xian-Zhu Fu; Ching-Ping Wong; Jian Wu; Rong Sun; Ying Yang
- Source
- Journal of Power Sources. 393:54-61
- Subject
- Supercapacitor
Materials science
Nanostructure
Renewable Energy, Sustainability and the Environment
Composite number
Energy Engineering and Power Technology
02 engineering and technology
engineering.material
Current collector
010402 general chemistry
021001 nanoscience & nanotechnology
01 natural sciences
Capacitance
0104 chemical sciences
Coating
Electrode
engineering
Fiber
Electrical and Electronic Engineering
Physical and Theoretical Chemistry
Composite material
0210 nano-technology
- Language
- ISSN
- 0378-7753
Cu wires are coated by porous/dense Ni bi-layers as current collectors through electroless plating and hydrogen bubble dynamic template electrodepostion methods. The unique coaxial composite current collectors can be beneficial from the high electrical/thermal conductivity of metal Cu core and high corrosion resistance of dense metal Ni coating as well as porous Ni substrate for growth of active materials. Furthermore, the metal wire current collectors have excellent flexibility and mechanical strength. Highly flexible solid-state fiber supercapacitors are then fabricated by binder-free integrated electrodes of hierarchical MnCo2O4 nanothorns grown on porous/dense Ni bi-layers coated Cu wires. The fiber supercapacitors reach capacitance of 20.6 mF cm−1 (54.8 mF cm−2) and energy density of 4.8 μWh cm−1 (12.8 μWh cm−2) at a power density of 32.25 μW cm−1 (110 μW cm−2). Moreover, the twist fiber supercapacitors show good rate capability and cycling stability. The outstanding performances of the fiber supercapacitors might be attributed to the hierarchically nanothorns MnCo2O4 active materials and the unique porous/dense Ni coated Cu wire current collectors. Our results can provide a novel strategy to design flexible nanostructure fiber supercapacitors for energy storage applications in future wearable electronics.