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      저자 : Weiei Gong (검색결과 2 건)
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      • KCI등재

        Preparation and oxidation properties of biomorphic porous carbon derived from native bamboo

        Pengzhao Gao,Shiting Huang,Weiei Gong,Wenxiang Wang 한양대학교 세라믹연구소 2011 Journal of Ceramic Processing Research Vol.12 No.6

        A biomorphic porous carbon (BPC) was prepared by carbonized native bamboo under an Ar atmosphere through a controlled heating process. Microstructural properties of BPC were studied by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and X-ray diffraction (XRD). The pyrolytic behavior of bamboo and non-isothermal oxidation properties of BPC were studied by thermogravimetric analysis (TGA). Experimental results show that BPC has a porous interconnected honeycomb microstructure, with a multi-peak pore size distribution, and is a typical non-graphitizable carbon. With an increasing carbonization temperature, the (002) peak of the XRD spectrum becomes stronger, the interplanar spacing decreases, the structure of BPC slowly evolved towards that of ideal graphite, and also the density increases, and bulk porosity decreases. The non-isothermal oxidation properties of BPC exhibit a self-catalytic characteristic, which is discussed through a schematic model.

      • KCI등재

        Model-free kinetics applied to an oxidation mechanism of a biomorphic carbon template derived from pine

        Pengzhao Gao,Wenxiang Wang,Weiei Gong 한양대학교 세라믹연구소 2010 Journal of Ceramic Processing Research Vol.11 No.4

        A biomorphic carbon template (BCT) was developed by carbonizing pine under vacuum. Structural and oxidation properties of BCT were evaluated by scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), and thermogravimetric analysis (TGA). Experimental results show that BCT has a topologically uniform interconnected porous network microstructure, and is typical non-graphitizable carbon containing C =C bonds, C–O–C bonds and a C–H structure. The non-isothermal oxidation properties of BCT exhibit a partially self-accelerating characteristic; the oxidation process of BCT is firstly controlled by a chemical reaction, and then controlled by a chemical reaction and gas diffusion together, which is obtained from a Vyazovkin model-free method, and the corresponding activation energy (E a) is also calculated.

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