Assistant Professor


2-4 Hibikino, Wakamatsu-ku, Kitakyushu-shi, Fukuoka

Research Fields, Keywords

Degree 【 display / non-display

  • Kyushu Institute of Technology -  Doctor of Engineering  2014.03

Biography in Kyutech 【 display / non-display

  • 2017.01

    Kyushu Institute of TechnologyGraduate School of Life Science and Systems Engineering   Department of Biological Functions Engineering   Assistant Professor  


Publications (Article) 【 display / non-display

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

      123 ( 5 ) 3004 - 3010   2019.02  [Refereed]

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    © 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

      10 ( 1 ) 29 - 34   2019.01  [Refereed]

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    © 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

      290   255 - 261   2018.11  [Refereed]

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    © 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

      86 ( 6 ) 355 - 362   2018.01  [Refereed]

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    © 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

      20 ( 3 ) 627 - 633   2018.01  [Refereed]

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    © 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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