• The hierarchically porous nitrogen-doped carbon (SHPNC) was fabricated by biorenewable carbon sources.

• The SHPNC electrode exhibited a high specific capacity, excellent cyclic stability, and superior rate capability.

• The asymmetric potassium-ion hybrid capacitors delivered a maximum energy density of 135 Wh kg⁻¹, long lifespan with excellent capacity retention, and outstanding ultrafast charge/slow discharge performance.

中文翻译：

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茧丝衍生的多孔碳作为阳极，用于高强度钾离子混合电容器

• 分层多孔氮掺杂碳（SHPNC）是通过生物可再生碳源制造的。

• SHPNC电极具有高比容量，出色的循环稳定性和优异的倍率性能。

• 非对称钾离子混合电容器的最大能量密度为135 Wh kg ^-1，使用寿命长，具有出色的容量保持能力，并具有出色的超快充电/慢速放电性能。