Flexible, water-proof, wire-type supercapacitors integrated with wire-type UV/NO2 sensors on textiles. (May 2017)

• Record Type: Journal Article
• Authors: Kim, Daeil; Keum, Kayeon; Lee, Geumbee; Kim, Doyeon; Lee, Sang-Soo; Ha, Jeong Sook
• Is Part Of: Nano energy. Volume 35(2017:May)
• Page Start: 199
• Page End: 206
• Publication Date: 2017-05
• Subjects: Wire-type supercapacitor -- Integrated power supply -- Wire-type UV/NO2 sensor -- Electronic textile; Nanoscience -- Periodicals; Nanotechnology -- Periodicals; Nanostructured materials -- Periodicals; Power resources -- Technological innovations -- Periodicals; Nanoscience; Nanostructured materials; Nanotechnology; Power resources -- Technological innovations; Periodicals; 621.042
• DOI: 10.1016/j.nanoen.2017.03.044
• Languages: English
• ISSNs: 2211-2855

Abstract

Abstract: Wire-type devices that can be integrated onto fabrics are being actively studied to meet the demands for various wearable systems. In this study, we report the fabrication of wire-type supercapacitors (WSCs) integrated with wire-type UV/NO2 sensors on textiles. The WSC consists of braided carbon fiber electrodes coated with multi-walled carbon nanotubes (MWNT)/V2 O5 nanowires(NWs), a cellulose-based separator, and an ionic-liquid-based electrolyte of [EMIM][TFSI]/LiCl/Al2 O3 nanoparticles. This fabricated WSC exhibited good performance with an extended potential window of 1.5 V and areal capacitance of 10.6 mF/cm 2 at 0.5 mA/cm 2 . Very stable electrochemical performance of the WSC was also observed under mechanical deformations of bending, knotting, and folding. In addition, stable WSC performance in water was demonstrated by encapsulation with a thermally-shrinkable tube. Furthermore, μ-light-emitting diodes and wire-type NO2 gas and UV sensors were operated by the integrated multiple WSCs on a textile: The MWNT-coated wool wire detected NO2 gas reproducibly by increase of the current. Using spiropyran and ZnO NWs, changes in both color and photo-current were detected upon UV irradiation. This work demonstrates the great potential of our WSC for use in wearable textile sensor systems as an efficient energy storage device. Graphical abstract: Highlights: Wire-type supercapacitors(WSCs) were integrated with UV/NO2 sensors on textiles. The electrode of the WSCs was composed of carbon fiber coated with MWNT and V2 O5 NWs. Carbon fiber was braided for mechanical stability. Ionic liquid based electrolyte was used to widen the potential range of the WSCs. Wire-type supercapacitors operated stably under mechanical deformations.