Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/151657
Title: Ultrafast-freezing-assisted mild preparation of biomass-derived, hierarchically porous, activated carbon aerogels for high-performance supercapacitors
Authors: Zhang, Youfang
Zhao, Chenyang
Ong, Wee Kit
Lu, Xuehong
Keywords: Engineering::Materials
Issue Date: 2019
Source: Zhang, Y., Zhao, C., Ong, W. K. & Lu, X. (2019). Ultrafast-freezing-assisted mild preparation of biomass-derived, hierarchically porous, activated carbon aerogels for high-performance supercapacitors. ACS Sustainable Chemistry and Engineering, 7(1), 403-411. https://dx.doi.org/10.1021/acssuschemeng.8b03788
Journal: ACS Sustainable Chemistry and Engineering
Abstract: Lignin-derived carbon aerogels (CAs) with hierarchically porous morphologies are facially prepared via ultrafast freezing of droplets of lignin/KOH solutions followed by freeze-drying and in situ activation during carbonization. The CAs exhibit a high specific surface area of 1681.6 m² g⁻¹ and abundant mesopores and macropores, which facilitate electrolyte absorption into the carbon framework, ion diffusion, and charge transport. Moreover, the CAs also possess abundant oxygenated groups, which provide additional Faradaic redox reactions. Thus, this mild process, which involves much less KOH, is effective in boosting the electrochemical performance of the CAs as supercapacitor electrodes. The optimized CA exhibits a high specific capacitance of 189 F g⁻¹ at 1 A g⁻¹, a high energy density of 26.25 Wh kg⁻¹ at a power density of 1000 W kg⁻¹, and capacitance retention of 97.4% after 10000 cycles.
URI: https://hdl.handle.net/10356/151657
ISSN: 2168-0485
DOI: 10.1021/acssuschemeng.8b03788
Rights: © 2018 American Chemical Society. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:MSE Journal Articles

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