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Preparation of Hierarchical Porous Carbon Aerogels by Microwave Assisted Sol-Gel Process for Supercapacitors

Low-cost resorcinol formaldehyde (RF) organic aerogels were prepared by using resorcinol and formaldehyde as precursors, and sodium hydroxide as a catalyst through a single-mode microwave radiation-assisted sol-gel method and ambient temperature drying. Because of the ring focusing and power-max tec...

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Autores principales: Cai, Xueqing, Tan, Guiming, Deng, Zhentao, Liu, Jianhong, Gui, Dayong
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6473755/
https://www.ncbi.nlm.nih.gov/pubmed/30960413
http://dx.doi.org/10.3390/polym11030429
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author Cai, Xueqing
Tan, Guiming
Deng, Zhentao
Liu, Jianhong
Gui, Dayong
author_facet Cai, Xueqing
Tan, Guiming
Deng, Zhentao
Liu, Jianhong
Gui, Dayong
author_sort Cai, Xueqing
collection PubMed
description Low-cost resorcinol formaldehyde (RF) organic aerogels were prepared by using resorcinol and formaldehyde as precursors, and sodium hydroxide as a catalyst through a single-mode microwave radiation-assisted sol-gel method and ambient temperature drying. Because of the ring focusing and power-max technology, the fabrication procedure of carbon aerogels (CAs) are much easier, faster, and cheaper than traditional methods. The RF aerogels were then pyrolysized at 900 °C, and the KOH activation process was used to further dredge micropores in the carbon aerogels. The CAs were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), nitrogen adsorption/desorption, and a series of electrochemical tests. The KOH activated carbon aerogels with 3D-nano-network structure exhibited a high specific surface area of 2230 m(2) g(−1) with appropriate pore volumes of micro-, meso-, and macropores. The specific capacitance of CAs activated by KOH measured in a two-electrode cell was 170 F g(−1) at 0.5 A g(−1) with excellent rate capability and cycle stability in 6 M KOH electrolyte.
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spelling pubmed-64737552019-05-03 Preparation of Hierarchical Porous Carbon Aerogels by Microwave Assisted Sol-Gel Process for Supercapacitors Cai, Xueqing Tan, Guiming Deng, Zhentao Liu, Jianhong Gui, Dayong Polymers (Basel) Article Low-cost resorcinol formaldehyde (RF) organic aerogels were prepared by using resorcinol and formaldehyde as precursors, and sodium hydroxide as a catalyst through a single-mode microwave radiation-assisted sol-gel method and ambient temperature drying. Because of the ring focusing and power-max technology, the fabrication procedure of carbon aerogels (CAs) are much easier, faster, and cheaper than traditional methods. The RF aerogels were then pyrolysized at 900 °C, and the KOH activation process was used to further dredge micropores in the carbon aerogels. The CAs were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), nitrogen adsorption/desorption, and a series of electrochemical tests. The KOH activated carbon aerogels with 3D-nano-network structure exhibited a high specific surface area of 2230 m(2) g(−1) with appropriate pore volumes of micro-, meso-, and macropores. The specific capacitance of CAs activated by KOH measured in a two-electrode cell was 170 F g(−1) at 0.5 A g(−1) with excellent rate capability and cycle stability in 6 M KOH electrolyte. MDPI 2019-03-06 /pmc/articles/PMC6473755/ /pubmed/30960413 http://dx.doi.org/10.3390/polym11030429 Text en © 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Cai, Xueqing
Tan, Guiming
Deng, Zhentao
Liu, Jianhong
Gui, Dayong
Preparation of Hierarchical Porous Carbon Aerogels by Microwave Assisted Sol-Gel Process for Supercapacitors
title Preparation of Hierarchical Porous Carbon Aerogels by Microwave Assisted Sol-Gel Process for Supercapacitors
title_full Preparation of Hierarchical Porous Carbon Aerogels by Microwave Assisted Sol-Gel Process for Supercapacitors
title_fullStr Preparation of Hierarchical Porous Carbon Aerogels by Microwave Assisted Sol-Gel Process for Supercapacitors
title_full_unstemmed Preparation of Hierarchical Porous Carbon Aerogels by Microwave Assisted Sol-Gel Process for Supercapacitors
title_short Preparation of Hierarchical Porous Carbon Aerogels by Microwave Assisted Sol-Gel Process for Supercapacitors
title_sort preparation of hierarchical porous carbon aerogels by microwave assisted sol-gel process for supercapacitors
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6473755/
https://www.ncbi.nlm.nih.gov/pubmed/30960413
http://dx.doi.org/10.3390/polym11030429
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