All Fiber Based Electrochemical Capacitor towards Wearable AC Line Filters with Outstanding Rate Capability. Issue 5 (24th January 2019)

• Record Type: Journal Article
• Authors: Gao, Kaifei; Wang, Siliang; Liu, Weijie; Yue, Yang; Rao, Jiangyu; Su, Jun; Li, Luying; Zhang, Zhi; Liu, Nishuang; Xiong, Lun; Gao, Yihua
• Is Part Of: ChemElectroChem. Volume 6:Issue 5(2019)
• Page Start: 1450
• Page End: 1457
• Publication Date: 2019-01-24
• Subjects: AC line filtering -- fiber supercapacitors -- oriented structure -- wearable devices -- wet spinning; Electrochemistry -- Periodicals; 541.37
• DOI: 10.1002/celc.201801593
• Languages: English
• ISSNs: 2196-0216

Abstract

Abstract: Due to their high spatial utilization, excellent flexibility and good adaptability, fiber‐shaped devices have promising potential for applications in wearable electronics. However, the fiberization process of the component with alternate current (AC) line filtering function is still far from being satisfactory, since it is difficult to arrange an ordered structure in a fiber shape in large‐scale manufacturing. This leads to a slow frequency response. Herein, a weavable fiber‐shaped electrochemical capacitor (SC) for AC line filtering is made of reduced graphene oxide (rGO) fibers with a highly oriented porous structure by wet‐spinning method. The highly consistent orientations of the rich pores greatly improve the ionic accessible sites, ion mobility and the electron transport pathways. As a result, the all‐fiber‐based SC revealing a high rate performance (500 V s −1 ) and a fast frequency response (RC time constant ∼0.241 ms, phase angle ∼−80°) is successfully applied to filter ±1.5 V AC to 1.04 V direct current (DC). Notably, the highly flexible SC exhibits an outstanding consistency during the performance test at bending and folding states. This work shows a potential substitution for aluminium electrolytic capacitors (AEC) towards wearable electronic. Abstract : With every fiber of its being : a reduced graphene oxide fiber is continuously synthesised on large scale in an ordered structure using a wet spinning method. The wet spun reduced graphene oxide fiber is fabricated for fiber‐shape supercapacitors and applied in AC line filtering. The fiber‐shape supercapacitors can be woven and exhibit good filtering performance for some waveforms, such as Gaussian, sawtooth wave etc.