A team of researchers reporting in ACS Energy Letters has now designed a compact zinc-ion supercapacitor that can be taken apart quickly and reused, without sacrificing performance. The device is built from a zinc metal–copper foil anode, an activated carbon-fiber cathode, and a solid electrolyte made from a porous resin soaked in zinc chloride solution. That means the carbon-fiber cathode can be recovered and reused in new cells. The recovered carbon-fiber cathode was then reused twice more, each time paired with fresh solid electrolytes and zinc anodes, showing how the device could be efficiently recycled. The recycled carbon fibers were reused two further times, each with new electrolytes and fresh zinc anodes.