Fiber Supercapacitors Utilizing Pen Ink for Flexible/Wearable Energy Storage

A novel type of flexible fiber/wearable supercapacitor that is composed of two fiber electrodes – a helical spacer wire and an electrolyte – is demonstrated. In the carbon-based fiber supercapacitor (FSC), which has high capacitance performance, commercial pen ink is directly utilized as the electrochemical material. FSCs have potential benefits in the pursuit of low-cost, large-scale, and efficient flexible/wearable energy storage systems. Flexible/stretchable devices for energy harvesting and storage, such as flexible solar cells,1 flexible chemical batteries,2 and flexible supercapacitors,3 are being extensively studied to meet aesthetic demands and the needs of specific environments. The pursuit of…