Hierarchical porous biomass-derived carbon framework with ultrahigh surface area for outstanding capacitance supercapacitor
Hierarchical porous biomass-derived carbon framework with ultrahigh surface area for outstanding capacitance supercapacitor
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DOI：
10.1016/j.renene.2021.08.008
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发表时间：
2021-12
期刊：
影响因子：
8.7
通讯作者：
Hengtao Xu;Yi Zhang;Li-Ying Wang;Ye Chen;Shuyan Gao
中科院分区：
文献类型：
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作者：
Hengtao Xu;Yi Zhang;Li-Ying Wang;Ye Chen;Shuyan Gao
以枸杞为原料，采用三聚氰胺与KOH复合活化的方法成功制备了多孔炭骨架材料。具有分级的大孔/中孔/微孔的生物质衍生的碳框架显示出3344 m2 g − 1的表面积和1.71 cm 3 g −1的足够的总孔体积。优化结构的多孔碳电极具有优异的电化学性能。在1 A g− 1和30 A g−1下，比电容分别达到520.0 F g− 1和291.0 F g− 1，在30 A g−1下循环10 000次后，电容保持率为96.8%。电极的能量密度也高达12.5 W h kg− 1。深入探讨了炭材料的优化结构与优异性能之间的关系。碳骨架材料具有良好的上级电化学性能，其主要原因在于其具有分级的孔隙率、良好的比表面积、足够的总孔容、合适的石墨化度和良好的杂原子掺杂，从而使其具有快速的离子扩散、足够的电荷储存和赝电容。该研究为合成高性能超级电容器用多孔生物质炭材料提供了有效的指导。
A porous carbon framework is successfully synthesized from lycium chinensis via a novel strategy using melamine matched with KOH as dual-activator. The biomass-derived carbon framework with hierarchical macro-/meso-/micro pores demonstrates an ultrahigh surface area of 3344 m2g−1and a sufficient total pore volume of 1.71 cm3g−1. The porous carbon electrode with optimized structure presents an outstanding electrochemical performance. The specific capacitance reaches 520.0 F g−1at 1 A g−1and 291.0 F g−1at 30 A g−1with 96.8 % capacitance retention after 10 000 cycles at 30 A g−1. The energy density is also as high as 12.5 W h kg−1for the electrode. The relationship between optimized structure and excellent performance of carbon materials is deeply explored. The superior electrochemical performance of carbon framework can be ascribed to its hierarchical porosity, ultrahigh surface area, sufficient total pore volume, proper graphitization degree and favorable heteroatom-doping, which will result in the fast ion diffusion, sufficient charge storage as well as the contributed pseudocapacitance. The work provides an effective guidance for synthesizing the superb porous biomass-derived carbon materials for supercapacitor with high performance.