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Polymers 2019, 11(3), 429; https://doi.org/10.3390/polym11030429

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

College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518055, China
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Received: 27 January 2019 / Revised: 26 February 2019 / Accepted: 28 February 2019 / Published: 6 March 2019
(This article belongs to the Special Issue Polymer and Composite Aerogels)
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Abstract

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 m2 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. View Full-Text
Keywords: microwave; carbon aerogels; hierarchical porous; KOH activation; supercapacitor microwave; carbon aerogels; hierarchical porous; KOH activation; supercapacitor
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Cai, X.; Tan, G.; Deng, Z.; Liu, J.; Gui, D. Preparation of Hierarchical Porous Carbon Aerogels by Microwave Assisted Sol-Gel Process for Supercapacitors. Polymers 2019, 11, 429.

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