Journal of Power Sources, Vol.367, 34-41, 2017
Wearable supercapacitors on polyethylene terephthalate fabrics with good wash fastness and high flexibility
All solid-state micro-supercapacitors (MSC) have emerged as attractive energy-storage units for portable and wearable electronics. Here, we describe a textile-based solid-state MSC via laser scribing of graphene oxide (GO) coatings on a flexible polyethylene terephthalate (PET) fabric. The laser-scribed graphene oxide layers (LGO) possess three-dimensionally porous structure suitable for electrochemical-double layer formation. To improve the wash fastness and the flexibility of the as-prepared MSCs, glutaraldehyde (GA) was employed to crosslink the GO layers and PVA-gel electrolyte onto the PET fabric. The resultant all solid-state MSC5 exhibited excellent flexibility, high areal specific capacitance (756 mu F. cm(-2) at 20 mV. s(-1)), and good rate capability when subject to bending and laundering. Furthermore, the MSC device showed a high power density of about 1.4 W.cm(-3) and an energy density of 5.3 x 10(-5) Wh.cm(-3), and retained 98.3% of its initial capacitance after 1000 cycles at a current density of 0.5 mA.cm(-2). This work is the first demonstration of in-plane MSCs on PET fabric surfaces with enhanced durability and flexibility. (C) 2017 Elsevier B.V. All rights reserved.
Keywords:Micro-supercapacitor (MSC);Laser patterning;Graphene oxide;Cross-linking;Solid-state electrolyte;Wash fastness