Flexible fiber-shaped supercapacitors with high energy density based on self-twisted graphene fibers
Abstract
In this research, self-twisted graphene fibers are successfully prepared by a simple method. The assembled self-twisted graphene fiber exhibits excellent mechanical properties, the elongation is up to 26.3% and the tensile intensity reaches up to 244.8 MPa, which is higher than that of the previously reported graphene fibers. Based on the remarkable mechanical properties of self-twisted graphene fibers, the flexible fiber-shaped supercapacitors are fabricated. The fiber-shaped supercapacitor demonstrates outstanding flexibility, even at the knotted state the capacitance is very stable. Furthermore, the fiber-shaped supercapacitor exhibits excellent supercapacitive performance with high energy density (25.5 mWh cm-3) and long-term cycling stability, retaining 91% of the capacitance over 10,000 cycles. The outstanding performances of flexible fiber-shaped supercapacitors indicate the self-twisted graphene fibers have promising applications in portable and flexible energy storage devices.
- Publication:
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Journal of Power Sources
- Pub Date:
- September 2019
- DOI:
- 10.1016/j.jpowsour.2019.226711
- Bibcode:
- 2019JPS...43326711Z
- Keywords:
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- Self-twisting;
- Self-twisted graphene fiber;
- Fiber-shaped supercapacitor