Abstract
AbstractAqueous zinc‐ion hybrid capacitors (ZIHCs) attract widespread attention due to their excellent electrochemical performance, safety, and low cost. Here, a honeycomb‐like porous carbon is synthesized as the cathode of ZIHCs via facile pre‐oxidation in combination with an activation process. The pre‐oxidized porous carbon (PPC) displays a larger specific surface area and faster electrochemical kinetics compared to porous carbon without pre‐oxidation (PC), realizing a superior electrochemical performance. The PPC cathode can deliver a capacity of 238 mAh g−1 at 0.1 A g−1. Besides, the hybrid capacitors can achieve a high energy density of 193.6 Wh kg−1 at 76.6 W kg−1 and 109.5 Wh kg−1 at a maximum power density of 3981 W kg−1. More importantly, the hybrid capacitor exhibits a good cycling stability with a capacity retention of 83 % after 20000 cycles at a high current density of 2 A g−1. This cathode material – with an excellent electrochemical performance – could pave the way for application of ZIHCs.
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