高辻 義行 (タカツジ ヨシユキ)

TAKATSUJI Yoshiyuki

写真a

職名

助教

研究室住所

福岡県北九州市若松区ひびきの2-4

研究分野・キーワード

鍍金、触媒電極、CO2資源化

取得学位 【 表示 / 非表示

  • 九州工業大学 -  博士(工学)  2014年03月

学内職務経歴 【 表示 / 非表示

  • 2017年01月
    -
    継続中

    九州工業大学   大学院生命体工学研究科   生体機能応用工学専攻   助教  

 

論文 【 表示 / 非表示

  • Experimental and Theoretical Elucidation of Electrochemical CO <inf>2</inf> Reduction on an Electrodeposited Cu <inf>3</inf> Sn Alloy

    Morimoto M., Takatsuji Y., Iikubo S., Kawano S., Sakakura T., Haruyama T.

    Journal of Physical Chemistry C    123 ( 5 ) 3004 - 3010   2019年02月  [査読有り]

     概要を見る

    © 2019 American Chemical Society. The reaction selectivity of an electrode catalyst can be modulated by regulating its crystal structure, and the modified electrode may show different CO 2 reduction selectivity from that of its constituent metal. In this study, we investigated the mechanisms of the electrochemical CO 2 reduction on an electrodeposited Cu 3 Sn alloy by experimental and theoretical analyses. The electrodeposited Cu 3 Sn alloy electrode showed selectivity for CO production at all the applied potentials, and HCOOH production increased with an increase in the applied potential. In particular, hydrocarbon generation was well suppressed on Cu 3 Sn(002). To understand this selectivity change in electrochemical CO 2 reduction, we conducted density functional theory calculations for the reaction on the Cu 3 Sn(002) surface. According to the theoretical analysis, the Cu sites in Cu 3 Sn(002) contributed more to the stabilization of H∗, COOH∗, and CO∗ as compared with the Sn sites. Furthermore, the results indicated that Cu 3 Sn(002) decreased the surface coverage of reaction intermediates such as H∗, COOH∗, and CO∗. We believe that these effects promoted CO∗ desorption while suppressing H 2 generation, CO∗ protonation, and C-C bond formation. The results also suggested that the surface Sn concentration significantly affected the reaction selectivity for HCOOH production from CO 2 .

    DOI Scopus

  • Highly Selective Methane Production Through Electrochemical CO<inf>2</inf> reduction by Electrolytically Plated Cu-Co Electrode

    Takatsuji Y., Nakata I., Morimoto M., Sakakura T., Yamasaki R., Haruyama T.

    Electrocatalysis    10 ( 1 ) 29 - 34   2019年01月  [査読有り]

     概要を見る

    © 2018, Springer Science+Business Media, LLC, part of Springer Nature. Among the electrode materials used for electrolytic CO2 reduction, only Cu shows a special function of producing not only carbon monoxide (CO), but also hydrocarbons from CO2. We found that, in electrolytic CO2 reduction using an electrolytically plated Cu-Co electrode, a hydrocarbon product with high faradaic efficiency (FE) could be obtained with low-FE CO. The plated electrodes have a Co solid solution on the Cu surface. The non-localized Co changes the adsorption energy of the reaction intermediate in CO2 reduction. Consequently, by increasing the Co content in Cu, HCOOH can be selectively produced. Further, in electrolytic CO2 reduction with an applied potential of − 1.19 V vs. reversible hydrogen electrode (RHE), the selectivity of methane (CH4) production improved, while the selectivity of ethylene (C2H4) formation lowered. In the reduction using the plated electrode containing 14% Co, the FE of CH4 production reached the highest at 47.7%. These results suggested that mixing Co in Cu promotes the hydrogenation of CH2* to CH3* and inhibits the dimerization of CH2* species. Furthermore, this research on plated electrodes is useful for the development of catalytic electrodes for electrolytic CO2 reduction. [Figure not available: see fulltext.]

    DOI Scopus

  • Visualization of catalytic edge reactivity in electrochemical CO<inf>2</inf> reduction on porous Zn electrode

    Morimoto M., Takatsuji Y., Hirata K., Fukuma T., Ohno T., Sakakura T., Haruyama T.

    Electrochimica Acta    290   255 - 261   2018年11月  [査読有り]

     概要を見る

    © 2018 Elsevier Ltd In the study, the catalytic edge reactivity on porous Zn electrode has successfully visualized through the electrochemical CO2 reduction to CO. It is well known that the activity of a CO2 reduction reaction catalyst depend on the type of material and surface nano-structure. Consequently, numerous researchers are interested in the relation between the catalyst activity and surface conditions such as morphology, oxidation state, and crystal orientation. However, it is difficult to explain the mechanisms of catalytic CO2 reduction and visualize the catalytic activity. Our results demonstrate, that this strategy not only improved the selective CO production, but also helped visualize the catalytic reactivity on the edge site via open-loop electric potential microscopy (OL-EPM). The obtained OL-EPM image strongly suggests that the edge site of porous Zn acts as an efficient reactive site in the CO2 electrochemical reduction reaction.

    DOI Scopus

  • Green surface cleaning in a radical vapor reactor to remove organic fouling on a substrate

    Yamasaki R., Takatsuji Y., Morimoto M., Sakakura T., Matsuo K., Haruyama T.

    Electrochemistry    86 ( 6 ) 355 - 362   2018年01月  [査読有り]

     概要を見る

    © The Electrochemical Society of Japan, All rights reserved. Green cleanup processes for adhered organic fouling on solid surfaces can be successfully performed using a radical vapor reactor (RVR). The RVR can produce large concentrations of reactive oxygen species (ROS, e.g. singlet oxygen (1O2) and hydroxyl radicals (OH)) and can expose them to objective materials. The RVR finds excellent utility in the fields of sterilization and surface functionalization. In this study, RVR is employed in a green cleanup of solid surfaces fouled by an organic polymer and a protein. The RVR produced ROS and removed the adhered organic polymers and proteins from the solid surface. The mechanism of how ROS react with fouling molecules was also elucidated by surface analysis. The greatest advantage of this green RVR cleanup process is that it discharges only air and water. The ROS production and exposure by the RVR successfully cleaned the adhered organic polymer and protein at ambient temperature and pressure without any chemicals. This high-quality, low-cost cleaning technology, which does not require much time and produces no hazardous waste, makes a great contribution to the cleaning industry.

    DOI Scopus

  • Excitation of H<inf>2</inf>O at the plasma/water interface by UV irradiation for the elevation of ammonia production

    Sakakura T., Uemura S., Hino M., Kiyomatsu S., Takatsuji Y., Yamasaki R., Morimoto M., Haruyama T.

    Green Chemistry    20 ( 3 ) 627 - 633   2018年01月  [査読有り]

     概要を見る

    © 2018 The Royal Society of Chemistry. Ammonia is well known to be a very important chemical substance for human life. Simultaneously, the conventional ammonia production process needs pure nitrogen and pure hydrogen. Hydrogen has been produced from either liquid natural gas (LNG) or coal. In this study, water is used as a direct hydrogen source for ammonia production, thereby obviating the need for catalysts or water electrolysis. We have studied and developed a plasma/liquid interfacial reaction (P/L reaction) that can be used to produce ammonia from air (nitrogen) and water at ambient temperature and pressure, without any catalysts. In this study, the P/L reaction entails enhanced ultraviolet (UV) irradiation of the surface of the water phase. The nitrogen plasma/water interface reaction locus can produce ammonia. In contrast, the vacuum ultraviolet (VUV) irradiated interface reaction locus produces increased amounts of ammonia. In a spin trap electron spin resonance (st-ESR) experiment, large amounts of atomic H (H) were produced by UV irradiation, especially by VUV irradiation. The derived H effectively enhanced the P/L reaction rate.

    DOI Scopus

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