针对低成本、绿色高能量密度储能材料的迫切需求,首次运用一种将预碳化与碳酸钾活化相结合的两步法制备策略,从甜菜根当中提取出高性能且生物相容性良好的多级多孔碳材料(BRAC)。进一步探究了活化温度对材料微观结构演变所产生的影响,并且对BRAC的结构特征、孔隙分布特性以及元素组成等关键性能指标予以详尽解析。结果表明:在最优活化条件下制得的BRAC-700样品,展现出了高度发达的分级多孔结构,其比表面积高达1658.88m2/g。基于BRAC-700样品组装的超级电容器显示出优异的比电容(在0.5A/g下为340F/g),并且在20A/g下保持超过50%的比电容。用双电极配置构造的基于BRAC-700的对称超级电容器在250W/kg下显示出12.92Wh/kg的能量密度。可为未来先进储能领域提供了极具前景的解决方案,有望以低成本、绿色工艺实现可再生生物质衍生碳材料的工业化规模生产。
To address the growing demand for low-cost,eco-friendly,and high-energy-density energy storage materials,this study firstly presented a two-step preparation method combining pre-carbonization and K2CO3 activation to successfully extract high-performance,biocompatible,multi-stage porous carbon materials (BRAC) from beetroot.We deeply investigated the effect of activation temperature on the microstructural evolution of the material and thoroughly analyzed the key performance indexes,such as structural features,pore distribution characteristics,and elemental composition of BRAC.The results showed that the BRAC-700 sample produced under the optimal activation conditions exhibited a highly developed hierarchical porous structure with a specific surface area as high as 1658.88m2/g.Supercapacitors assembled from the BRAC-700 showed superior specific capacitance (340F/g at 0.5A/g) and remained over 50% of specific capacitance at 20A/g.The BRAC-700-based symmetric supercapacitor,constructed with a two-electrode configuration,demonstrated an energy density of 12.92Wh/kg at 250W/kg.This approach holds great promise to achieve low-cost,green,and industrial-grade production of renewable biomass-derived carbon materials for advanced energy storage applications in the future.
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基金资助
山西省百人计划创新团队资助项目(DC2000005702);1331工程骨干创新团队资助项目(DT17100004)
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