Renewable and environmentally friendly biomass-based carbon electrode materials naturally possess fast ion transport, high adsorption, and excellent chemical stability for high-performance energy-storage devices. However, intelligently building the effectively biomass-transferred carbon materials for the requirement of high energy density is still a big challenge to date. Here, a hierarchically divacancy defect building platform is reported for effectively biomass-transferred and highly interconnected 3D dual-activated porous carbon fibers (DACFs) based on the internal−external dual-activation function of the pre-embedded KOH and CO 2 molecular. This uniquely interconnected frameworks not only fully provide the abundant active sites for ion interaction, but also efficiently guarantee the substantial accommodation for ion storage. Based on this, the as-prepared DACFs-based supercapacitors deliver a high energy density of 61.3 Wh kg −1 at a power density of 875 W kg −1 in the EMIMBF 4 ionic liquid. This work not only provides a simple and efficient technique to enhance the energy density of carbon materials, but also probably promotes its additional application in environmental remediation.

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