Ultrahigh-rate wire-shaped supercapacitor based on graphene fiber. (August 2017)

• Record Type: Journal Article
• Authors: Yu, Jiali; Wang, Mei; Xu, Ping; Cho, Seung-Hyun; Suhr, Jonghwan; Gong, Ke; Meng, Linghui; Huang, Yudong; Byun, Joon-Hyung; Oh, Youngseok; Yan, Yushan; Chou, Tsu-Wei
• Is Part Of: Carbon. Volume 119(2017)
• Page Start: 332
• Page End: 338
• Publication Date: 2017-08
• Subjects: Carbon -- Periodicals; Carbone -- Périodiques; Koolstof; Toepassingen; Electronic journals; 546.681
• DOI: 10.1016/j.carbon.2017.04.052
• Languages: English
• ISSNs: 0008-6223

Abstract

Abstract: 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 100 V s −1 while maintaining good capacitive behavior. When the scan rate increased by 5000 times, from 20 mV s −1 to 100 V s −1, 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. Graphical abstract: