Details of a Researcher - Kondoh, Hiroshi

Kondoh, Hiroshi

写真a

Affiliation: Faculty of Science and Technology, Department of Chemistry （Yagami）

Position: Professor

Related Websites

http://www.chem.keio.ac.jp/kondoh/index/eng/

External Links

Career 【 Display / hide 】

1990.04

-

1997.03

通産省工業技術院, 化学技術研究所, 研究員
1997.03

-

1998.03

通産省工業技術院　, 物質工学工業技術研究所, 主任研究官
1998.03

-

2002.03

東京大学　, 大学院理学系研究科化学専攻, 専任講師
2002.03

-

2006.05

東京大学, 大学院理学系研究科化学専攻, 助教授
2003.04

-

2004.03

名古屋大学, 大学院工学研究科, 非常勤講師

Academic Background 【 Display / hide 】

1988.03

The University of Tokyo, Faculty of Science, Department of Chmistry

University, Graduated
1990.03

The University of Tokyo, Graduate School, Division of Science, Department of Chemsitry

Graduate School, Completed, Master's course

Academic Degrees 【 Display / hide 】

D.Sc., The University of Tokyo, Dissertation, 1995.09

Research Areas 【 Display / hide 】

Nanotechnology/Materials / Fundamental physical chemistry (Physical Chemistry)

Research Keywords 【 Display / hide 】

Synchrotron Radiation Science
Surface Science
触媒化学

Research Themes 【 Display / hide 】

Development of synchrotron-based technique to study dynamic phenomena at solid surfaces and its application,

1998

-

Present

Books 【 Display / hide 】

Compendium of Surface and Interface Analysis

Springer, Singapore, 2018

Scope: Chapter “Ambient Pressure X-Ray Photoelectron Spectroscopy”
X線光電子分光法

高桑　雄二他, 講談社, 2018

Scope: 5.6節、6.1節
Foundation and Application of XAFS

KONDOH Hiroshi, 講談社, 2017.07

Scope: 5章5節、6節
XAFS Techniques for Catalysts, Nanomaterials, and Surfaces

KONDOH Hiroshi, Springer International Publishing, Switzerland, 2016.10

Scope: pp.365-382
ブルーバックス「すごいぞ！身の回りの表面科学」

尾嶋正治　他, 講談社, 2015.10

Papers 【 Display / hide 】

Promoting effect of basic metal additives on DeNOx reactions over Pt-based three-way catalysts

Jing Y., Wang G., Mine S., Kawai J., Toyoshima R., Kondoh H., Zhang X., Nagaoka S., Shimizu K.i., Toyao T.

Journal of Catalysis （Journal of Catalysis) 416 209 - 221 2022.12

ISSN 00219517

　View Summary

Pt has been economically favored over Rh and Pd. However, Pt-based three-way catalysts (TWCs) have been studied less than Pd- and Rh-based TWCs; therefore, their properties have not yet been sufficiently evaluated, especially under conditions relevant to modern three-way catalysis operation, wherein deviations from stoichiometric conditions are often encountered. In this study, we examined the promotional effect of basic metal additives in Pt/M/Al2O3 (M = Ba, La, Sr) on the efficiency of three-way catalytic reactions. The catalytic activities of the Pt/M/Al2O3 catalysts for NO, CO, and total hydrocarbons were superior to those of Pt/Al2O3; moreover, Ba enhanced the catalytic activity of Pt-based catalysts more efficiently than La and Sr. The best-performing catalyst, Pt/Ba/Al2O3, was subjected to kinetic studies and various in situ/operando spectroscopic experiments, namely, X-ray absorption spectroscopy, infrared spectroscopy, and ambient-pressure X-ray photoelectron spectroscopy (AP-XPS), to investigate the role of Ba in the NO reduction reaction. The Pt0 species loaded on Ba/Al2O3 were more electron-rich than those loaded on Al2O3, thereby promoting NO dissociation into N and O atoms, as revealed by the AP-XPS results. Moreover, the efficient formation of intermediate surface NOx species, including nitrites and nitrates, and their reactivities toward reductant gases, such as H2 or CO, were critical for promoting the effect of Ba on the NO reduction reaction.
- Access to Document (DOI)
Origin of the High Selectivity of the Pt-Rh Thin-Film H<inf>2</inf>Gas Sensor Studied by Operando Ambient-Pressure X-ray Photoelectron Spectroscopy at Working Conditions

Toyoshima R., Tanaka T., Kato T., Uchida K., Kondoh H.

Journal of Physical Chemistry Letters （Journal of Physical Chemistry Letters) 13 （ 36 ） 8546 - 8552 2022.09

　View Summary

The Pt-Rh thin-film sensors exhibit excellent sensitivity and selectivity for H2 gas detection. Here, we studied the mechanism of highly selective detection of H2 by the Pt-Rh thin-film sensors with ambient-pressure X-ray photoelectron spectroscopy (AP-XPS) measurements at working conditions, which were paralleled with electric resistivity measurements. The elemental composition and chemical state of surface Pt and Rh drastically change depending on the background gas environments, which directly link to the sensor response. It is revealed that surface segregated Pt atoms accelerate dissociative adsorption of H2, resulting in a reduction of the sensor surface and then a decrease of electric resistivity of the film, whereas a thin oxidized Rh layer blocks dissociation of the other reducing agent, that is, NH3. This is supported from the adsorption energetics obtained by the density functional theory (DFT) calculations.
- Access to Document (DOI)
Substrate Effect of Ir and Rh on Surface ReO<inf>x</inf>Species under a Hydrogen Atmosphere Studied by NAP-XPS

Chen J., Kawai J., Ozawa K., Toyoshima R., Tomishige K., Kondoh H.

Journal of Physical Chemistry C （Journal of Physical Chemistry C) 126 （ 28 ） 11544 - 11552 2022.07

ISSN 19327447

　View Summary

The substrate effect of M-Re (M is a noble metal) bifunctional catalysts for C-O hydrogenolysis has been studied by using single-crystal substrates including Ir(111) and Rh(111) with in situ near-ambient-pressure X-ray photoelectron spectroscopy (NAP-XPS). Compared with Ir-Re and Rh-Re nanoparticle systems reported in the literature, the single crystals Ir(111) and Rh(111) have shown a more significant substrate effect in determining the surface Re species under a H2 atmosphere at elevated temperatures. It has been found that the hydrogen dissociation and spillover efficiency as the intrinsic property of the noble metals significantly impacts the surface species. A surface that supplies hydrogen more efficiently results in a lower overall oxidation state of Re. Most importantly, the chemical environment of OH species is also closely related to the hydrogen spillover; that is, the more efficient hydrogen spillover, the lower is the oxidation state of Re(-OH). Because the Re-OH sites are commonly considered as the active sites for terminal binding of the reactant molecules, the noble-metal substrates are expected to impact the binding strength of the adsorbate species and hence the overall catalytic activity by tuning the acidity of the Re-OH sites.
- Access to Document (DOI)
A newly designed compact CEY-XAFS cell in the soft X-ray region and its application to surface XAFS measurements under ambient-pressure conditions without photoinduced side effects

Shimizu H., Toyoshima R., Isegawa K., Mase K., Nakamura J., Kondoh H.

Physical Chemistry Chemical Physics （Physical Chemistry Chemical Physics) 24 （ 5 ） 2988 - 2996 2022.02

ISSN 14639076

　View Summary

We report a newly designed compact cell to measure XAFS spectra with the conversion electron yield (CEY) method in the soft X-ray region under ambient-pressure gas conditions. Secondary electrons generated from the gas and sample by collision of X-ray-absorption-induced Auger electrons are collected by a positively biased collector electrode to obtain XAFS spectra. It was confirmed that this cell is applicable to soft X-ray surface XAFS measurements for different types of materials such as insulating organic materials and metal oxides under 1 bar gas conditions. During the measurements, photoinduced side effects were observed; i.e. photoinduced degradation of organic materials and photoinduced reduction/oxidation of metal oxides. We found that these photoinduced side effects can be sufficiently suppressed by controlling the measuring conditions. The presented measuring approach will enable surface XAFS spectra to be obtained in the soft X-ray region for various types of functional materials under ambient-pressure working conditions. This journal is
- Access to Document (DOI)
Ligand effects on surface oxide at RhPd(100) alloy surfaces: A density functional theory calculation study

Shirahata N., Toyoshima R., Yoshida M., Ueda K., Mase K., Mun B.S., Kondoh H.

Surface Science （Surface Science) 716 2022.02

ISSN 00396028

　View Summary

Density functional theory calculations were applied to a study on ligand effects on a Pd surface oxide formed on RhPd(100) alloy surfaces. It was found that chemical composition of the topmost layer of alloy significantly influences on the electronic structure of the Pd surface oxide. Such interlayer ligand effects are originating from the Rh−O and Pd−O interactions between the topmost layer of alloy and the Pd surface oxide. These effects give rise to substantial changes in binding energies of adsorbates and could change catalytic activity depending on atomic fraction of the Rh−Pd alloy.
- Access to Document (DOI)

Papers, etc., Registered in KOARA 【 Display / hide 】

Development of ambient-pressure ultrasoft x-ray surface XAFS and application to operando observation of catalytic reactions under ambient pressure conditions

Kondō, Hiroshi

科学研究費補助金研究成果報告書 2020
Mechanistic Study on catalytic reaction by combination of soft-x-ray and infrared operando spectroscopy

Kondo, Hiroshi

科学研究費補助金研究成果報告書 2016
Development of time-resolved ambient-pressure surface core-level spectroscopy and its application to surface dynamic processes

Kondo, Hiroshi

科学研究費補助金研究成果報告書 2010

Reviews, Commentaries, etc. 【 Display / hide 】

In-situ Observations of Catalytic Surface Reactions with Soft X-rays under Working Conditions

KONDOH Hiroshi

J. Phys.: Condens. Matter (Institute of Physics) 27 083003(1) - 083003(15) 2015.02

Article, review, commentary, editorial, etc. (scientific journal), Joint Work
In-situ observation of model catalysts under reaction conditions using x-ray core-level spectroscopy

KONDOH Hiroshi

Chem. Rec. (Wiley) 14 ( 5 ) 806 - 818 2014.08

Article, review, commentary, editorial, etc. (scientific journal), Joint Work

Presentations 【 Display / hide 】

オペランド分光による触媒の動的挙動の観測

KONDOH Hiroshi

電気化学会第85回大会 (東京) ,

2018.03
,
Oral presentation (invited, special), 電気化学会
触媒反応のオペランド計測

KONDOH Hiroshi

科学技術未来戦略ワークショップ「高度炭素・水素循環に資する革新的反応・分離のためのCxHyOz制御科学」 (東京) ,

2017.11
,
Oral presentation (invited, special), JST-CRDS
作動する触媒を追う－分光観測を通して－

KONDOH Hiroshi

第57回オーロラセミナー (旭川) ,

2017.07
,
Oral presentation (invited, special), 触媒学会北海道支部
Operando Observations of Catalytic Reactions on Platinum Group Metal Surfaces with Near Ambient Pressure XPS

KONDOH Hiroshi

TIMS-CENIDE Joint Symposium on Nanoscience and Nanotechnology (Tsukuba, Japan) ,

2017.03
,
Oral presentation (invited, special), TIMS, Tsukuba University
オペランド観測と触媒開発－見ると造るが1 つになる時代へ－

KONDOH Hiroshi

触媒学会界面分子変換研究会・日本表面科学会触媒表面科学研究部会合同ワークショップ (東京都・文京区) ,

2017.03
,
Oral presentation (invited, special), 触媒学会界面分子変換研究会・日本表面科学会触媒表面科学研究部会

Research Projects of Competitive Funds, etc. 【 Display / hide 】

Development of operando measurement system based on ultrasoft-x-ray charged-particle-yield surface XAFS and its application to studies on catalysis

2022.04

-

2025.03

MEXT,JSPS, Grant-in-Aid for Scientific Research, 基盤研究(B), Principal investigator
Development of ambient-pressure ultrasoft x-ray surface XAFS and application to operando observation of catalytic reactions under ambient pressure conditions

2018.06

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2020.03

MEXT,JSPS, Grant-in-Aid for Scientific Research, Grant-in-Aid for Challenging Research (Exploratory) , Principal investigator
Mechanistic Study on catalytic reaction by combination of soft-x-ray and infrared operando spectroscopy

2014.04

-

2017.03

MEXT,JSPS, Grant-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (A) , Principal investigator

　View Summary

In this study it was aimed to develop spectroscopic operando observation systems using soft-X-rays and infrared rays and to apply these techniques to detection of catalytically active phases and reactants adsorbing on the active phases under reaction conditions. The development of both operando observation systems has been successfully achieved, which enables us to observe catalytically active surfaces under reaction conditions via X-ray photoelectron spectroscopy, polarized X-ray absorption spectroscopy and polarization-modulation infrared reflection absorption spectroscopy, combined with monitoring of catalytic activity by mass spectrometry. On the basis of this approach we have been able to reveal catalytically active phases and reaction mechanisms, which had been hardly uncovered, and thus we could demonstrate that this approach is useful in catalytic studies.

Awards 【 Display / hide 】

日本表面真空学会学会賞

2021.05, 公益社団法人　日本表面真空学会

Type of Award： Award from Japanese society, conference, symposium, etc.
平成26年度電気化学会論文賞

2015.03, 電気化学会, Structure and Photo-Induced Charge Transfer of Pyridine Molecules Adsorbed on TiO2(110): A NEXAFS and Core-Hole-Clock Study
日本表面科学会フェロー

2014.05, 公益社団法人日本表面科学会

Type of Award： Other
第7回花王研究奨励賞

KONDOH Hiroshi, 2005.05, 走査型トンネル顕微鏡と放射光X線分光法による自己組織化膜の構造と分子プロセスの解明

Type of Award： Award from publisher, newspaper, foundation, etc.

Courses Taught 【 Display / hide 】

SURFACE AND INTERFACE SCIENCE

2024
SOLID STATE CHEMISTRY (INORGANIC AND ANALYTICAL CHEMISTRY 3)

2024
SEMINAR IN CHEMISTRY

2024
LABORATORIES IN CHEMISTRY 1

2024
INORGANIC CHEMISTRY 1

2024

Courses Previously Taught 【 Display / hide 】

表面界面科学

keio Univeristy

2020.10

-

Present
,
Autumn Semester
化学A

Keio University

2009.04

-

Present
,
Spring Semester, Lecture, Within own ｆaculty, 1h, 200people

量子化学、構造化学
表面化学特論

Keio University

2009.04

-

Present
,
Autumn Semester, Lecture, Within own ｆaculty, 1h, 40people
現代化学概論

Keio University

2009.04

-

Present
,
Autumn Semester, Lecture, 1h, 200people
化学実験第１

Keio University

2008.04

-

Present
,
Spring Semester, Laboratory work/practical work/exercise, Within own ｆaculty, 6h, 35people

物理化学実験、無機化学実験

Social Activities 【 Display / hide 】

VUV・SX高輝度光源利用者懇談会

2012.04

-

Present

Academic Activities 【 Display / hide 】

Associate Editor

Royal Society of Chemistry,
2022.06

-

Present

Memberships in Academic Societies 【 Display / hide 】

触媒学会,

2002.04

-

Present
日本放射光学会,

1999.04

-

Present
日本表面科学会,

1992.12

-

Present
The Chemical Society of Japan,

1991.03

-

Present
The Physical Society of Japan,

1988.10

-

Present

Committee Experiences 【 Display / hide 】

2023.05

-

Present

理事, 日本表面真空学会
2018.04

-

Present

領域アドバイザー, JST-CREST
2018.04

-

2022.03

幹事, 日本化学会物理化学ディビジョン
2017.10

-

2022.09

評議員, 日本放射光学会
2016.11

-

2023.03

専門委員, 文部科学省科学技術・学術審議会