(College of Materials Science and Engineering, Hunan University, Changsha 410082)

Abstract:A biomorphic carbon material which retained its anatomical features was prepared by carbonizing walnut shell at controlled heating rates. Microstructure, components, specific surface area, oxidation mechanism of WSC were analyzed by SEM, XRD, TGA and so on. Experimental results show that WSC has abundant interconnected pores and pore spaces,whose diameter is about 0.5 to 1 μm and the specific surface is 380m²·g^-1. It is a typical non-graphitizable carbon. With the increasing of carbonization temperature, the (002) peak became stronger, the interplanar spacing decreased, and the structure of WSC slowly evolved toward that of ideal graphite. The non-isothermal oxidation rate of WSC firstly increased and then decreased with the increasing of temperature, which may result from the variational quantity of activited carbon.

Keywords:biomorphic porous carbon, micorstructure, non-isothermal oxidation