期刊
CHEMICAL ENGINEERING JOURNAL
卷 381, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2019.122695
关键词
Binder-free; Reduced graphene oxide film; Flower-like; FeCo2S4/RGOF; Asymmetric supercapacitors
资金
- National Natural Science Foundation of China [51674068, 51774002, 51771046, 51874079, 51871046]
- Natural Science Foundation of Hebei Province [E2018501091]
- Science and Technology Project of Hebei Province [15271302D]
- Training Foundation for Scientific Research of Talents Project, Hebei Province [A2016005004]
- Fundamental Research Funds for the Central Universities [N172302001, N182306001, N182312007]
- Qinhuangdao City University student of Science and Technology Innovation and Entrepreneurship Project [PZB1810008T-46, PZB1810008T-14]
With the aim of developing sustainable energy storage and a flexible device exhibiting excellent electrochemical performance, a supercapacitor system comprising a highly reduced graphene oxide film (RGOF) as substrate and a spinel flower-like FeCo2S4 array as the active material is fabricated. The specific capacitance of the FeCo2S4/RGOF electrode reaches 2487.97 F g(-1) at a current density of 5 mA cm(-2) while maintaining superior stability with 95.9% capacitance retention after 5000 cycles, thereby surpassing that of previously reported Fe-Co bimetallic sulfides. This is ascribed to the synergistic effect between conductive RGOF and active FeCO2S4, which are rich in redox reactions. The fabricated FeCo2S4/RGOF is utilized as a positive electrode in an asymmetric supercapacitor, delivering a high energy density of 88.2 W h kg(-1) at 800 W kg(-1). Furthermore, the supercapacitor exhibits excellent cycling stability with 85.1% capacitance retention after 5000 cycles at 5 A g(-1) and outstanding persistence after different deformation conditions. Thus, the FeCo2S4 hybrid film electrode with specific flexibility shows potential applicability in portable and wearable energy storage devices.
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