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.

中文翻译：

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基于 3D 打印金属有机骨架阴极的高性能水系锌离子混合电容器

锌离子混合电容器是一种很有前途的储能装置，但目前的总容量受到碳阴极电容的限制。我们通过锌基金属-有机骨架 ZIF-8 的 3D 打印和热解制备了具有良好循环和机械稳定性的分级多孔氮掺杂碳阴极。当结合到锌离子混合电容器中时，我们实现了 16.9 F cm ^-2的面积电容和 7.23 mW h cm ^-2的能量密度，优于基于传统阴极的锌离子混合电容器。