“…Increasing the operating voltage of ASCs via the development of metal-ion hybrid battery capacitors (MHCs) consisting of a capacitor-type cathode and a battery-type anode (such as Li-, K-, Na-, or Zn-metal) is considered an effective strategy to improve the overall energy density. 10–15 Among the various MHCs, aqueous Zn-ion hybrid capacitors (ZHCs) are the most promising owing to the abundant natural resources of Zn metal, high theoretical capacity (820 mA h g −1 ), lower redox potential (than normal hydrogen electrodes), outstanding safety, and environmental benignity. 16–21 Particularly, studies have demonstrated the simplicity and economic viability of ZHCs composed of activated porous carbon (PC) as a cathode, Zn foil as an anode, and aqueous Zn-electrolyte for energy storage via adsorption/desorption (ads/des), deposition/stripping and precipitation/dissolution mechanisms, respectively.…”