Synthesis of nanoporous graphite-derived carbon-silica composites by a mechanochemical intercalation approach |
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Authors: | Chu Y-H Wang Z-M Yamagishi M Kanoh H Hirotsu T Zhang Y-X |
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Institution: | PRESTO, Japan Science and Technology Agency, Applied Interfacial Chemistry RG, Research Institute for Environmental Management Technology, 2217-14 Hayashi-cho, Takamatsu-shi, Kagawa 761-0395, Japan. |
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Abstract: | A mechanochemical intercalation approach which applies a simple mechanical milling to induce intercalation reaction was applied to introduce controlled amount of tetraethoxylsilane (TEOS) into surfactant-preexpanded graphite oxide, and the relationships between the intercalation structure, the porosities of the calcined products, and the Si addition were examined. It was found that a small added amount of TEOS produced a more expanded ordered layer structure with the interlayer distance and silicon content increasing with the amount of TEOS added, although a large amount of added TEOS easily induces layer delamination, resulting in a less ordered structure. The silica structure in the composite is changed from a disordered structure having enhanced bond strain to a condensed silica network when the amount of TEOS added increases. The porosities of the final calcined samples increase with the increase of silicon content but then decrease slightly after reaching a maximum where silicon content starts to become constant, indicating that both silicon content and the composition state of silica particles and carbon layers play important roles in porosity formation. |
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