کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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5432115 | 1508828 | 2017 | 7 صفحه PDF | دانلود رایگان |
The emerging wire-shaped supercapacitors (WSSs) have motivated tremendous research interests in energy storage devices. However, challenges still exist in the pursuit of high-rate performance WSS. Here, a graphene fiber made from chemical vapor deposition grown laminated graphene sheet is adopted to form a WSS which exhibits an exceptional rate capability with a relaxation time constant of 1.4 ms, smallest among WSSs reported to date. Furthermore, the resulting WSS can be charged-discharged at a high scan rate of 100Â VÂ sâ1 while maintaining good capacitive behavior. When the scan rate increased by 5000 times, from 20Â mVÂ sâ1 to 100Â VÂ sâ1, the graphene fiber based WSS maintains 38.6% of its original capacitance. After 10,000 galvanostatic charge-discharge cycles, the specific capacitance retains over 105%, demonstrating a long cycle stability.
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Journal: Carbon - Volume 119, August 2017, Pages 332-338