Ultrafast-freezing-assisted mild preparation of biomass-derived, hierarchically porous, activated carbon aerogels for high-performance supercapacitors

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 abund...

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Main Authors: Zhang, Youfang, Zhao, Chenyang, Ong, Wee Kit, Lu, Xuehong
Other Authors: School of Materials Science and Engineering
Format: Article
Language:English
Published: 2021
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Online Access:https://hdl.handle.net/10356/151657
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1516572021-07-22T09:18:11Z Ultrafast-freezing-assisted mild preparation of biomass-derived, hierarchically porous, activated carbon aerogels for high-performance supercapacitors Zhang, Youfang Zhao, Chenyang Ong, Wee Kit Lu, Xuehong School of Materials Science and Engineering Engineering::Materials Lignin Carbon Aerogel 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. Nanyang Technological University We thank Nanyang Technological University, Singapore for providing a Ph.D. scholarship and funding in the course of this work. C.Z. is grateful for the financial support from the Natural Science Foundation of Shenzhen University (Grant 2018034). 2021-07-22T09:18:11Z 2021-07-22T09:18:11Z 2019 Journal Article 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 2168-0485 0000-0001-7773-3198 https://hdl.handle.net/10356/151657 10.1021/acssuschemeng.8b03788 2-s2.0-85059364818 1 7 403 411 en ACS Sustainable Chemistry and Engineering © 2018 American Chemical Society. All rights reserved.
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Engineering::Materials
Lignin
Carbon Aerogel
spellingShingle Engineering::Materials
Lignin
Carbon Aerogel
Zhang, Youfang
Zhao, Chenyang
Ong, Wee Kit
Lu, Xuehong
Ultrafast-freezing-assisted mild preparation of biomass-derived, hierarchically porous, activated carbon aerogels for high-performance supercapacitors
description 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.
author2 School of Materials Science and Engineering
author_facet School of Materials Science and Engineering
Zhang, Youfang
Zhao, Chenyang
Ong, Wee Kit
Lu, Xuehong
format Article
author Zhang, Youfang
Zhao, Chenyang
Ong, Wee Kit
Lu, Xuehong
author_sort Zhang, Youfang
title Ultrafast-freezing-assisted mild preparation of biomass-derived, hierarchically porous, activated carbon aerogels for high-performance supercapacitors
title_short Ultrafast-freezing-assisted mild preparation of biomass-derived, hierarchically porous, activated carbon aerogels for high-performance supercapacitors
title_full Ultrafast-freezing-assisted mild preparation of biomass-derived, hierarchically porous, activated carbon aerogels for high-performance supercapacitors
title_fullStr Ultrafast-freezing-assisted mild preparation of biomass-derived, hierarchically porous, activated carbon aerogels for high-performance supercapacitors
title_full_unstemmed Ultrafast-freezing-assisted mild preparation of biomass-derived, hierarchically porous, activated carbon aerogels for high-performance supercapacitors
title_sort ultrafast-freezing-assisted mild preparation of biomass-derived, hierarchically porous, activated carbon aerogels for high-performance supercapacitors
publishDate 2021
url https://hdl.handle.net/10356/151657
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