Starch-based carbon aerogels prepared by an innovative KOH activation method for supercapacitors

超级电容器 淀粉 材料科学 碳纤维 气凝胶 化学工程 纳米技术 电极 复合材料 化学 有机化学 电化学 复合数 物理化学 工程类
作者
Zuozhao Zhai,Shasha Wang,Yuelong Xu,Lihui Zhang,Xiaolei Wang,Haitao Yu,Bin Ren
出处
期刊:International Journal of Biological Macromolecules [Elsevier BV]
卷期号:257: 128587-128587 被引量:23
标识
DOI:10.1016/j.ijbiomac.2023.128587
摘要

Biomass-based carbon aerogels hold promising application prospect in the field of supercapacitors. In this research, starch was selected as a raw material for preparing carbon aerogels. The preparation process of starch hydrogels was simplified by using KOH, which can change starch suspension into hydrogels at room temperature. Moreover, the molecular mixing of KOH and starch was realized, so that KOH can be fully utilized in the activation process. The specific surface area of the starch-based carbon aerogels prepared by this method was 1349 m2/g, and the proportion of micropores was 43.7 %. Remarkably, as electrode materials for supercapacitors, the starch-based carbon aerogels exhibited outstanding electrochemical performance. In a three-electrode system, the carbon aerogels exhibited specific capacitance of 211.5 F/g at 0.5 A/g and 138.5 F/g at 10 A/g, suggesting their suitability for high-current applications. In a symmetrical supercapacitor configuration, the materials exhibited an energy density of 11.3 Wh/kg at a power density of 0.5 kW/kg and the specific capacitance can maintain 98.91 % after 10,000 cycles. Overall, this work provides a new method for mixing activators, which will foster potential advances in starch based carbon aerogels.
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