MURAKAMI Naoya

写真a

Title

Associate Professor

Laboratory

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

Research Fields, Keywords

Spectroscopy, Photocatalyst, Photoelectrode

E-mail

E-mail address

Scopus Paper Info  
Total Paper Count: 0  Total Citation Count: 0  h-index: 18

Citation count denotes the number of citations in papers published for a particular year.

Undergraduate Education 【 display / non-display

  • 2002.03   Osaka University   Faculty of Engineering Science   Advanced a Year   JAPAN

Post Graduate Education 【 display / non-display

  • 2007.03  Hokkaido University  Graduate School, Division of Earth Environmental Science and Technology  Environmental Materials Science  Doctoral Program  Completed  JAPAN

  • 2004.03  Osaka University  Graduate School, Division of Engineering Science  Master's Course  Completed  JAPAN

Degree 【 display / non-display

  • Hokkaido University -  Doctor of Environmental Earth Science  2007.03

Biography in Kyutech 【 display / non-display

  • 2020.04
    -
    Now

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

  • 2012.11
    -
    2020.03

    Kyushu Institute of TechnologyFaculty of Engineering   Department of Materials Science   Associate Professor  

 

Publications (Article) 【 display / non-display

  • Simultaneous Measurements of Photoabsorption and Photoelectrochemical Performance for Thickness Optimization of a Semiconductor Photoelectrode

    Murakami N., Watanabe R.

    ACS Combinatorial Science    22 ( 12 ) 791 - 795   2020.12  [Refereed]

     View Summary

    © We established a system for simultaneous measurements of photoelectrochemical (PEC) reaction and photoabsorption in a semiconductor photoelectrode. This system uses a photoacoustic technique and photoelectrodes with a film-thickness gradient that was prepared by electrophoretic deposition of tungsten(VI) oxide particles while pulling up a substrate. The system enabled high-throughput determination of optimum film thickness, and the results showed that irradiation direction has a significant influence on PEC performance for a photoelectrode with a thick film. Furthermore, the mechanism of enhancement of PEC performance by postnecking treatment was discussed.

    repository DOI Scopus

  • In situ photoacoustic analysis of near-infrared absorption of rhodium-doped strontium titanate photocatalyst powder

    Shinoda T., Yamaguchi Y., Kudo A., Murakami N.

    Chemical Communications    56 ( 91 ) 14255 - 14258   2020.11  [Refereed]

     View Summary

    © The Royal Society of Chemistry. Near-infrared absorption of strontium titanate (SrTiO3) doped with rhodium (Rh) was investigated by photoacoustic (PA) Fourier transform infrared spectroscopy. In the absence of an electron acceptor and the presence of a hole scavenger, the largest absorption change in the Rh valence state from tetravalent to trivalent was observed in Rh-doped SrTiO3 prepared at 1473 K, which showed the highest activity for hydrogen evolution. PA measurements revealed the effective redox cycle mechanism between tetravalent and trivalent Rh ions in Rh-doped SrTiO3.

    repository DOI Scopus

  • Determination of the internal quantum efficiency for photoelectrochemical reaction in a semiconductor photoelectrode by photoacoustic detection

    Murakami N., Okuzono K.

    Chemical Communications    56 ( 40 ) 5417 - 5420   2020.05  [Refereed]

     View Summary

    © The Royal Society of Chemistry 2020. We showed for the first time the validity of photothermal measurement for determination of internal quantum efficiency, which is one of the most fundamental parameters for energy conversion systems. The measurement method using photoacoustic detection in the present study can be applied to a wide variety of samples and measurement conditions.

    repository DOI Scopus

  • Nitrogen Fixation in a Plasma/Liquid Interfacial Reaction and Its Switching between Reduction and Oxidation

    Sakakura T., Murakami N., Takatsuji Y., Haruyama T.

    Journal of Physical Chemistry C    124 ( 17 ) 9401 - 9408   2020.04  [Refereed]

     View Summary

    © 2020 American Chemical Society. There are multiple active species at the interface between the discharged gas phase and the water phase. Activated nitrogen species are generated in the nitrogen plasma gas by dielectric barrier discharge (DBD). The reaction at the interface between the gas phase containing the activated nitrogen species and water phase (P/L reaction) can produce nitrogen-derived compounds (N-compounds) in water. We have already clarified the mechanism of the P/L reaction focusing on highly active atomic nitrogen in a previous study. In this study, we report the mechanism of the P/L reaction by excited but metastable nitrogen molecules. Involving excited nitrogen molecules [N2(A3ςu+)] with a long lifetime, the reaction selectivity of N-compounds was clarified by quantitative analysis. Moreover, the active species in the water phase (H·, HO·, H2O2) of the P/L reaction were measured, and the involvement of the reaction in the generation of N-compounds was confirmed. The findings clarify that each activated nitrogen species reacts differently with H2O. These results suggest that the occurrence of either an oxidation reaction or a reduction reaction can be regulated by controlling the activated nitrogen species.

    DOI Scopus

  • Development of Plasmonic Photocatalyst by Site-selective Loading of Bimetallic Nanoparticles of Au and Ag on Titanium(IV) Oxide

    Zheng Z., Murakami N., Liu J., Teng Z., Zhang Q., Cao Y., Cheng H., Ohno T.

    ChemCatChem      2020.01  [Refereed]

     View Summary

    © 2020 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim Morphology-controlled rutile titanium(IV) oxide (TiO2) and anatase TiO2 were prepared by a hydrothermal method and their surfaces were selectively loaded with Au, Ag and AuAg bimetallic nanoparticles (NPs) by photo-deposition in order to obtain visible-light responsive photocatalysts. With the help of local surface plasmon resonance (LSPR) of noble metal NPs, the photocatalytic activity of noble metal-loaded TiO2 under visible-light irradiation was improved compared to that of bare TiO2. The enhancement of LSPR on the photocatalytic activity of rutile TiO2 was larger than that of anatase TiO2 with optimum amount of Au or AuAg. In addition, the reusability (stability) of AuAg-loaded TiO2 was much better than that of Ag-loaded TiO2. Double-beam photoacoustic results confirmed different trap energy level distribution lead to different electron transfer ways, resulting in different oxidizing capabilities and they gave one of important strategies for designing visible-light responsive TiO2.

    DOI Scopus

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Publications (Books) 【 display / non-display

  • ルチルTiO2単結晶

    村上直也,横野照尚 ( Joint Work )

    触媒調製ハンドブック  2011.04 ISBN: 978-4-8604-3377-2

Conference Prsentations (Oral, Poster) 【 display / non-display

  • 二酸化チタン中の蓄積電子を用いたアンモニア生成

    末永真里,村上直也

    第58回化学関連支部合同九州大会  2021.07  -  2021.07 

  • 光音響測定にもとづく酸化チタン(IV)光触媒におけるトラップ電子の生成過程の解明

    篠田樹,村上直也

    第58回化学関連支部合同九州大会  2021.07  -  2021.07 

  • 光音響分光法を用いた酸化チタン粒子中の欠陥準位の検出と電子蓄積過程の観察

    篠田樹,村上直也

    電気化学会第88回大会  2021.03  -  2021.03 

  • 赤外光音響分光法による粉末光触媒の電子トラップ準位の評価

    篠田樹,村上直也

    第127回触媒討論会  2021.03  -  2021.03 

  • ボールミル処理した酸化チタン(IV)光触媒粉末における欠陥生成の光音響分光解析

    篠田樹,村上直也,渡邊健太,山口友一,工藤昭彦

    日本化学会第100春季年会(2020)  2020.03  -  2020.03 

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Lectures 【 display / non-display

  • 大気活性成分の定量

    エコテクノ2017、第12回先端エコフィッティング技術研究開発センターワークショップ   2017.11.20 

  • 光音響分光法による半導体ナノ粒子の光触媒特性の評価

    第21回規則性多孔体研究会セミナー   2016.12.01 

Honors and Awards 【 display / non-display

  • Honda-Fujishima Prize

    2011.03.30     JAPAN

  • The 18th International Conference on Photochemical Conversion and Storage of Solar Energy, Best Poster Award

    2010.07.30     JAPAN

    Winner: Naoya Murakami,Teruhisa Ohno