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Zhai Z, Wang S, Xu Y, Zhang L, Wang X, Yu H, Ren B. Starch-based carbon aerogels prepared by an innovative KOH activation method for supercapacitors. Int J Biol Macromol 2024; 257:128587. [PMID: 38065463 DOI: 10.1016/j.ijbiomac.2023.128587] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2023] [Revised: 11/24/2023] [Accepted: 12/01/2023] [Indexed: 01/26/2024]
Abstract
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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Affiliation(s)
- Zuozhao Zhai
- Hebei Key Laboratory of Organic Functional Molecules, College of Chemistry and Materials Science, Hebei Normal University, Shijiazhuang, Hebei 050024, China; Institute of Energy Resources, Hebei Academy of Sciences, Shijiazhuang, Hebei 050081, China; Hebei Engineering Research Center for Water Saving in Industry, Shijiazhuang, Hebei 050081, China
| | - Shasha Wang
- Institute of Energy Resources, Hebei Academy of Sciences, Shijiazhuang, Hebei 050081, China; Hebei Engineering Research Center for Water Saving in Industry, Shijiazhuang, Hebei 050081, China
| | - Yuelong Xu
- Institute of Energy Resources, Hebei Academy of Sciences, Shijiazhuang, Hebei 050081, China; Hebei Engineering Research Center for Water Saving in Industry, Shijiazhuang, Hebei 050081, China
| | - Lihui Zhang
- Institute of Energy Resources, Hebei Academy of Sciences, Shijiazhuang, Hebei 050081, China; Hebei Engineering Research Center for Water Saving in Industry, Shijiazhuang, Hebei 050081, China
| | - Xiaolei Wang
- Hebei Yuehai Water Co., Ltd., Shijiazhuang, Hebei 050081, China
| | - Haitao Yu
- Hebei Key Laboratory of Organic Functional Molecules, College of Chemistry and Materials Science, Hebei Normal University, Shijiazhuang, Hebei 050024, China.
| | - Bin Ren
- Institute of Energy Resources, Hebei Academy of Sciences, Shijiazhuang, Hebei 050081, China; Hebei Engineering Research Center for Water Saving in Industry, Shijiazhuang, Hebei 050081, China
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