• 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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茧丝衍生的分层多孔碳作为高鲁棒性钾离子混合电容器的阳极

• 
  分级多孔氮掺杂碳（SHPNC）是由生物可再生碳源制备的。

• 
  SHPNC电极表现出高比容量、优异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具有135 Wh kg ^-1的最大能量密度、长寿命、优异的容量保持能力以及出色的超快充电/慢放电性能。