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首页> 外文期刊>Diamond and Related Materials >Preparation of oxygen-rich hierarchical porous carbon for supercapacitors through the co-carbonization of pitch and biomass
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Preparation of oxygen-rich hierarchical porous carbon for supercapacitors through the co-carbonization of pitch and biomass

机译：通过沥青和生物质的共碳化制备超级电容器的富氧层次多孔碳

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摘要

Oxygen-rich hierarchical porous carbons (PCs) were successfully prepared through the co-carbonization of mesophase pitch (MP) and biomass sawdust (BS), following KOH activation. The PCs possessed a high specific surface area and a considerable amount of oxygen functional groups on the surface due to BS containing hierarchical porous structures and an abundant of heteroatoms. Moreover, the PCs exhibited high graphitization degree due to MP with a great deal of polynuclear aromatic structural units for easily forming the graphitized structures. The results showed that the PC-5/5 obtained from the co-carbonization of MP and BS with weight ratio of 5/5 had a high oxygen functional groups (1.43 mmol/g C-OH, 0.65 mmol/g RO-C=O, 0.66 mmol/g O-C=O from Boehm titration results) and its surface area reached to 2361 m(2)/g. As an electrode material for supercapacitor, the prepared electrode from PC-5/5 exhibited a favorable specific capacitance of 324 F/g at a current density of 0.5 A/g in 6 mol/L KOH electrolyte. The electrode also demonstrated excellent rate ability with a retention rate of 75% when the current density increases from 0.5 to 5 A/g, and remained 95% of the capacitance at 5 A/g after 500 cycles. Therefore, the PCs obtained by co-carbonization of MP and BS have high potential as electrode materials. This route not only enhanced the benefit from biomass wastes, but also reduced the cost of producing electrode materials for supercapacitor.
机译：在KOH活化之后，通过共碳化成功制备了富氧的分层多孔碳（PC）通过中间相沥青（MP）和生物质锯末（BS）进行成功制备。由于含有分层多孔结构的BS，PCS在表面上具有高比表面积和大量的氧官能团，以及一系列杂原子。此外，PC由于具有大量多核芳族结构单元的MP而表现出高图石化程度，以容易地形成石墨化结构。结果表明，从MP和重量比为5/5的重量比的CP-5/5具有高氧官能团（1.43mmol / g C-OH，0.65mmol / g RO-C = o，从Boehm滴定结果的0.66mmol / g oc = o），其表面积达到2361米（2）/ g。作为超级电容器的电极材料，来自PC-5/5的制备电极在6mol / L KOH电解质中以0.5A / g的电流密度显示出324f / g的有利特定电容。当电流密度从0.5至5A / g增加时，电极还通过75％的保持率显示出优异的速率能力，并且在500次循环后，在5A / g处保持95％的电容。因此，通过CO-碳化而获得的PC和BS获得的PC具有高潜力作为电极材料。这条路不仅提高了生物质废物的益处，而且还降低了生产超级电容器的电极材料的成本。

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