TANSO
Online ISSN : 1884-5495
Print ISSN : 0371-5345
ISSN-L : 0371-5345
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Volume 2021, Issue 299
Displaying 1-4 of 4 articles from this issue
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  • Chemical and electrochemical synthesis of graphene oxide
    Yuta Nishina
    2021 Volume 2021 Issue 299 Pages 115-120
    Published: September 01, 2021
    Released on J-STAGE: October 01, 2021
    DOIhttps://doi.org/10.7209/tanso.2021.115
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    The first report on graphite oxidation by Schafhaeutl goes back to 1840, who intercalated small molecules between graphite layers with sulfuric acid and nitric acid. However, this report is not often cited, and Brodie’s method published later is often emphasized. The number of papers using graphene oxide (GO) has increased significantly since 2010. One of the reasons why GO has attracted attention is its ease of synthesis. GO can be easily produced if inexpensive graphite and an oxidizing agent or electrolytic equipment are available. In recent years, GO has been commercially available at a reasonable price, and researchers in various fields, not limited to chemists, have been able to handle it. As a result, GO has been used in a wide range of applications. In this paper, recent trends in chemical oxidation and electrochemical oxidation methods for GO synthesis are summarized.

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Review Paper
  • Development of activated carbon fiber (ACF) air purification technology
    Masaaki Yoshikawa
    2021 Volume 2021 Issue 299 Pages 121-126
    Published: September 01, 2021
    Released on J-STAGE: October 01, 2021
    DOIhttps://doi.org/10.7209/tanso.2021.121
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    Activated carbon fibers (ACFs), products of the Osaka Gas group, have a fiber diameter of 10 to 20 µm, where micropores of 1 to 2 nm on the surface are responsible for their adsorption rate which is more than 10 times that of granular activated carbon. They are also easy to mold. We have developed a technology to use the ACFs for air purification systems at the roadside. In particular, we have developed a parallel flow structure unit to efficiently remove nitrogen oxide (NOx) from polluted air using only natural wind and no electric power. The ACFs convert the NOx into nitrate ions (NO3−) by oxidation and can be regenerated by washing with water, leading to a long service life of the ACFs. These technologies can be applied to economical air pollution control on roads with heavy traffic where there are high NOx concentrations.

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Recent Doctoral Thesis
  • Studies on electrochemical degradation reactions in supercapacitors
    Rui Tang
    2021 Volume 2021 Issue 299 Pages 127-128
    Published: September 01, 2021
    Released on J-STAGE: October 01, 2021
    DOIhttps://doi.org/10.7209/tanso.2021.127
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    To extend supercapacitor applications, it is desired to increase the stability of supercapacitors. By increasing stability, the working voltage of supercapacitors can be increased, and thus, the energy density is also improved. It is generally anticipated that supercapacitor degradation is caused by electrolyte decomposition and carbon corrosion. Thus, understanding degradation mechanisms both at the electrolyte and carbon sides are crucial. In this study, the reactant in the organic electrolyte and the reaction sites on the carbon surface were systematically investigated by using a variety of carbon materials and carbon characterization techniques.

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