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Preparation and characterization of ZrCO/C composite aerogels

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Abstract

Zr-containing organic aerogels were synthesized by ligand substitution reaction of polyzirconoxone and 2, 4-dihydroxybenzoic acid, followed by polymerization with formaldehyde, and then supercritical drying using CO2. After carbonization and carbothermal reduction under an argon atmosphere, ZrCO/C composite aerogels with controllable zirconium content (47.8–78.6 wt%) were obtained. The carbothermal reduction was substantially completed at 1,500 °C, and the obtained ZrCO/C composite aerogels exhibit low oxygen contents (9.4–6.7 wt%) and high surface areas (589–147 m2/g). Pore morphologies of the ZrCO/C composite aerogels were investigated in detail by nitrogen sorption measurements, scanning electron microscopy and its associated energy-dispersive X-ray microanalysis measurements. The results show that the aerogels are composed of carbon framework and Zr-conglomerations, and the surface area of aerogel is severely affected by its zirconium content. The presence of reductive ZrC crystals can greatly enhance the oxidation resistance ability of amorphous carbon framework and prevent collapse.

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Acknowledgments

Financial supports from the State Key Basic Research Program of the PRC (2010CB934705) are greatly appreciated.

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Correspondence to Tong Zhao.

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Ye, L., Qiu, W., Li, H. et al. Preparation and characterization of ZrCO/C composite aerogels. J Sol-Gel Sci Technol 65, 150–159 (2013). https://doi.org/10.1007/s10971-012-2919-z

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  • DOI: https://doi.org/10.1007/s10971-012-2919-z

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