Pore Structure of Hard Carbon Made from Phenolic Resin Studied by 129Xe NMR

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  • Gotoh Kazuma
    Graduate School of Natural Science and Technology, Okayama University
  • Ueda Takahiro
    The Museum of Osaka University, Osaka University
  • Eguchi Taro
    The Museum of Osaka University, Osaka University
  • Kawabata Koji
    Industrial Technology Center of Okayama Prefecture
  • Yamamoto Kenji
    Graduate School of Natural Science and Technology, Okayama University
  • Murakami Yuki
    Graduate School of Natural Science and Technology, Okayama University
  • Hayakawa Satoshi
    Graduate School of Natural Science and Technology, Okayama University
  • Ishida Hiroyuki
    Graduate School of Natural Science and Technology, Okayama University

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The pore structure of hard carbon samples made from two kinds of phenolic resins by heating between 1073 and 1473 K was investigated by 129Xe NMR. The difference of porous structure of hard carbon samples by heat treatment temperature, which was difficult to analyze precisely by general gas adsorption methods, could be evaluated by Xe NMR at an equilibrium state of xenon gas adsorption. Carbon samples produced by heating precursors under a 0.1 MPa xenon atmosphere showed stronger NMR signals than carbon heated at reduced pressure, despite their almost identical powder X-ray diffraction (XRD) patterns. Applying this method, the dependence of NMR spectra on heating temperature between 1073 and 1473 K was examined. A carbon sample consisting of smaller particles showed almost constant shift values at about 102 ppm, while the peak of another sample with larger particles shifted between 118 and 82 ppm depending on the heating temperature. Then, almost all entrances of each sample closed above 1273 K. Using NMR with the improved heat-treatment by xenon gas, we evaluated pores in hard carbon that were hard to access from the outer surface of the hard carbon.

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