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Keywords:

  • energy storage;
  • fibers;
  • flexible/wearable electronics;
  • pen ink;
  • supercapacitors
Thumbnail image of graphical abstract

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.