High-performance aqueous zinc-ion hybrid capacitors based on 3D printed metal-organic framework cathodes

The zinc-ion hybrid capacitor is a promising energy storage device, but current overall capacity is limited by the capacitance of the carbon cathode. We produced a hierarchically porous, nitrogen-doped carbon cathode with good cycling and mechanical stability by 3D printing and pyrolysis of the zinc-based metal-organic framework ZIF-8. When incorporated into a zinc-ion hybrid capacitor, we achieved an areal capacitance of 16.9 F cm-2 and energy density of 7.23 mW h cm-2, outperforming zinc-ion hybrid capacitors based on conventional cathodes.

Automated summary

Researchers synthesized a nitrogen-doped hierarchically porous carbon cathode through 3D printing and pyrolysis of a zinc-based metal-organic framework ZIF-8. This cathode demonstrated excellent cycling and mechanical stability and when incorporated into a zinc-ion hybrid capacitor, it exhibited an areal capacitance of 16.9 F cm-2 and energy density of 7.23 mW h cm-2, outperforming conventional cathodes.