Sulfuric Acid Intercalation and Exfoliation of Nano Shell Carbon from Ni-catalyzed Wood Char

概要

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Wood char of genuine well-developed turbostratic carbon with a nano shell structure, produced by catalytic carbonization, was used to generate an intercalation compound with H2SO4. The turbostratic wood char prepared at 900 °C with Ni-catalyzation was put as an anode and electrochemically treated in 98% sulfuric acid at 30°C. During the treatment, a plateau in the potential curve appeared implying intercalation with H2SO4. Evidence of the intercalation was obtained by X-ray diffraction. The intercalated compound was washed in water and dried, and the residue obtained was roasted for several seconds in a flame at 700–800 °C. Observations by SEM and TEM revealed exfoliation at a nano-ordered level. The residue had adopted a flocculent appearance, with stacked carbon layers peeled from the nano shell. This exfoliation was possibly caused by the intercalant trapped between the graphitic layers during the roasting. The intercalating capability of this turbostratic carbon with a nano shell structure from wood was indicated.
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