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Ultrahigh-Surface-Area Hierarchical Porous Carbon from Chitosan: Acetic Acid Mediated Efficient Synthesis and Its Application in Superior Supercapacitor

Abstract

Development of an effective route to high-performance carbonaceous electrode materials derived from low-cost biomass is critical but remains challenging for supercapacitors. Here we propose a new and cost-effective way to produce chitosan-based hierarchical porous carbons by union of hydrothermal carbonization and chemical activation. The key to this preparation strategy is utilization of acetic acid as an additive for hydrothermal carbonization, which not only favors construction of a conducive environment for accessibility of activator KOH, but also leads to formation of a rigid semi-carbonized framework substrate for generating an ultrahighly porous structure. Thereby, our synthetic approach allows for lower activation agent and lower heating temperature when compared with normal chemical activation techniques, providing a more efficient way to ultrahigh-surface-area carbon materials. The as-prepared hierarchical porous carbon possesses a unique honeycomb-like framework and a highest BET surface area of 3532 m2 g-1 for all the carbon materials derived from chitosan. The combination of the hierarchical pore structure for rapid ion diffusion and the ultrahigh surface area for sufficient electrochemically active sites significantly improves material’s capacitive behaviors. An unusually high capacitance of 455 F g-1 and an excellent cycling stability of 99% capacity retention over 20000 cycles in KOH aqueous electrolyte, and a high energy density of 20.6 Wh kg-1 at a power density of 226.8 W kg-1 in 1.8-V Na2SO4 aqueous supercapacitors have been obtained, demonstrating that chitosan-based hierarchical porous carbons developed here is very attractive for application in supercapacitor.

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Publication details

The article was received on 13 Sep 2017, accepted on 08 Nov 2017 and first published on 08 Nov 2017


Article type: Paper
DOI: 10.1039/C7TA08046H
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Ultrahigh-Surface-Area Hierarchical Porous Carbon from Chitosan: Acetic Acid Mediated Efficient Synthesis and Its Application in Superior Supercapacitor

    J. Huang, Y. Liang, H. Hu, S. Liu, Y. Cai, H. Dong, M. Zheng, Y. Xiao and Y. Liu, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA08046H

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