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The preparation and characterization graphene-cross-linked phenol–formaldehyde hybrid carbon xerogels

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Abstract

A new synthesis route based on polycondensation of phenol and formaldehyde cross-linked by graphene oxide (GO) was developed. Wet gel after gelation was converted into an organic xerogel by ambient pressure drying to obtain GO-cross-linked phenol–formaldehyde (PF) organic xerogels (GOCPFOX). Graphene-cross-linked PF carbon xerogels (GCPFCX) were produced by carbonization. The morphology and chemical structure of GOCPFOX and GCPFCX were analyzed. The electrochemical behavior of GCPFCX as an electrode material in electric double-layer capacitors (EDLCs) was investigated. Results show that the high mechanical strength of GO increased the gel skeleton strength; thus, organic xerogels exhibit very low drying shrinkage. Scanning electron micrographs indicated that addition of GO altered the gel structure. Thus, when GO was added into the PF solution, the PF molecular chains were anchored on the surface of GO by chemical and physical interaction. The GCPFCX-10 sample achieved the highest specific surface area, mesoporous volume, and specific capacity with 378 m2/g, 0.56 cm3/g, and 116 F/g, respectively. Hence, GCPFCX is a potential material for EDLCs owing to its low production cost and ability to avoid supercritical drying.

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Authors and Affiliations

  1. The Key Laboratory of Beijing City on Preparation and Processing of Novel Polymer Materials, Beijing University of Chemical Technology, Beijing, 100029, China

    Ling Liu, Jie Yang & Qinghan Meng

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  1. Ling Liu
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  2. Jie Yang
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  3. Qinghan Meng
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Correspondence to Qinghan Meng.

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Liu, L., Yang, J. & Meng, Q. The preparation and characterization graphene-cross-linked phenol–formaldehyde hybrid carbon xerogels. J Sol-Gel Sci Technol 67, 304–311 (2013). https://doi.org/10.1007/s10971-013-3080-z

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  • DOI: https://doi.org/10.1007/s10971-013-3080-z

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