Toward wearable electronics: A lightweight all-solid-state supercapacitor with outstanding transparency, foldability and breathability

Wide applications of smart wearable electronics have triggered tremendous needs for energy storage devices featuring lightweight, transparency, foldability and breathability. However, conventional supercapacitor electrodes are always substrate-supported with a compact film structure, which strongly limits their air permeability, flexibility and transparency. In this report, we demonstrate the use of a freestanding, ultrathin (∼ 6 μm), highly...