Electrochemically triggered rational design of bismuth copper sulfide for wearable all-sulfide semi-solid-state supercapacitor with a wide operational potential window (1.8 V) and ultra-long life

Gel electrolyte-based wearable all-sulfide semi-solid-state supercapacitor (ASSSC) device with ∼100% capacitance retention across the 40 000 charge–discharge cycles. The ASSSC devices are attached to human fingers to power electronic gadgets.