Ramie carbon from the massively three-harvests-one-year and naturally channel-structured ramie straw is typically emerging as the excellent waste-biomass-utilization target toward high-performance electrochemical energy storage devices. However, the traditional activation strategies less fully optimize the pore distribution for the purpose of optimal energy storage capability. Herein, we reported the hierarchically interconnected three-dimensional ramie porous carbon based on waste ramie straw by internally-externally molecules-scissored activation strategy with pre-embedded KOH and re-added KOH molecules coordinately (in-ex-RPC). Benefiting from the synergistically internal-external activation strategy, this in-ex-RPC displays an excellent specific capacitance of 300 F g^–1, which is much better than that of ramie porous carbon singly through pre-embedded KOH activation (in-RPC, 194 F g^–1) or directly adding KOH activation (ex-RPC, 213 F g^–1). Based on it, the aqueous symmetric supercapacitors display a cyclic capacity of 90.9%-retaining after 20,000 cycles at 5 A g^–1. Therefore, this work may provide an effective strategy for energy storage applications of waste ramie straw and for further promoting waste biomass utilization.

来自大量一年三次收获和天然通道结构的苎麻秸秆的苎麻碳通常成为高性能电化学储能设备的极佳废物生物质利用目标。然而，传统的活化策略并没有完全优化孔隙分布以达到最佳储能能力的目的。在此，我们报道了基于废弃苎麻秸秆的分层互连三维苎麻多孔碳，采用内部-外部分子剪刀活化策略，预嵌入 KOH 并协调重新添加 KOH 分子（in-ex-RPC）。受益于协同的内部-外部激活策略，这种 in-ex-RPC 显示出 300 F g ^{–1的出色比电容}, 远优于苎麻多孔碳单独通过预埋KOH活化(in-RPC, 194 F g ^–1 )或直接加入KOH活化(ex-RPC, 213 F g ^–1 )。基于此，水系对称超级电容器在 5 A g ^–1下循环 20,000 次后，循环容量保持率为 90.9% 。因此，该工作可为废弃苎麻秸秆的储能应用和进一步促进废弃生物质资源化利用提供有效策略。