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Online ISSN : 1884-5495
Print ISSN : 0371-5345
ISSN-L : 0371-5345
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Review Papers
  • Revision of JIS R7651: “Measurement of Lattice Constants and Crystallite Sizes of Carbon Materials”
    Norio Iwashita
    2024 Volume 2024 Issue 306 Pages 97-101
    Published: June 30, 2024
    Released on J-STAGE: June 30, 2024
    DOIhttps://doi.org/10.7209/tanso.2024.97
    JOURNAL RESTRICTED ACCESS
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    On February 20, 2024, a revised edition of the Japanese Industrial Standard JIS R7651 “Measurement of Lattice Constants and Crystallite Sizes of Carbon Materials” was issued. This document, reviews the standardization activity regarding this JIS revision from the establishment of the former GAKUSHIN-method in 1962 to the first establishment of JIS in July 2007, through to the survey of JIS in 2021 and to this revision of the JIS. The major point of the revision are discussed.

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  • Steam activation of silicon carbide-derived porous carbon and its use as a capacitor electrode
    Takahiro Saito, Shinji Ishikawa
    2024 Volume 2024 Issue 306 Pages 102-111
    Published: June 30, 2024
    Released on J-STAGE: June 30, 2024
    DOIhttps://doi.org/10.7209/tanso.2024.102
    JOURNAL RESTRICTED ACCESS
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    Carbide derived carbons (CDCs), fabricated by the chlorination of carbides, have achieved high capacitances as the electrode materials of electric double layer capacitors (EDLCs) owing to their unique pore properties. Among CDCs, silicon carbide-derived carbons (SiC-CDCs) are suitable for the commercial electrode materials of EDLCs because of their cost, availability of the raw materials, and thermal stability of their nanostructures. However, the power densities of EDLCs using SiC-CDCs are limited by their average pore width which is as small as the ion sizes. In this study, we conducted steam activation of SiC-CDCs to widen the pore width, and evaluated their nanostructures and electrochemical properties as capacitor electrodes. The BET surface areas of the SiC-CDCs were increased from 1300 m2 g−1 to a maximum of approximately 2000 m2 g−1 by steam activation, and the ratio of the micropore and mesopore volumes of the activated SiC-CDCs could be controlled by changing the chlorination temperature before activation. Notably, activated SiC-CDCs chlorinated at 1100 °C had larger micropore volumes and narrower average pore widths than those chlorinated at higher temperatures. Moreover, an activated SiC-CDC with a surface area of 1900 m2 g−1 had a similar power density but a higher energy density and long-life stability than commercial activated carbons for EDLCs.

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