摘要
Nano Research volume 13,pages1686–1692(2020)Cite this article 210 Accesses 1 Citations Metrics details Abstract Fiber-shaped supercapacitors(FSCs),owing to their high-power density and feasibility to be integrated into woven clothes,have drawn tremendous attentions as a key device for flexible energy storage.However,how to store more energy while withstanding various types of mechanical deformation is still a challenge for FSCs.Here,based on a magnetron sputtering method,different pseudocapacitive materials are conformally coated on self-supported carbon nanotube aligned films.This fabrication approach enables a stretchable,asymmetric,coaxial fiber-shaped supercapacitors with high performance.The asymmetric electrode configuration that consists of CNT@NiO@MnOx cathode and CNT@Fe2O3 anode successfully extends the FSC’s electrochemical window to 1.8 V in an aqueous electrolyte.As a result,a high specific capacitance of 10.4 F·cm^−3 is achieved at a current density of 30 mA·cm^−3 corresponding to a high energy density of 4.7 mWh·cm^−3.The mechanical stability of the stretchable FSC is demonstrated with a sustainable performance under strains up to 75%and a capacitance retention of 95%after 2,000 cycles under 75%strain.
基金
This work was financially supported by the National Key R&D Program of China(No.2016YFB0100100)
the National Natural Science Foundation of China(Nos.21433013,U1832218,and 21975140).
