39. "Small Copper Nanoclusters Synthesized through Solid-State Reduction inside a Ring-Shaped Polyoxometalate Nanoreactor", Y. Koizumi, K. Yonesato, S. Kikkawa, S. Yamazoe, K. Yamaguchi, K. Suzuki, J. Am. Chem. Soc., 146, 14610-14619 (2024).

 

38. "Water-Tolerant Superbase Polyoxometalate [H2(Nb6O19)]6− for Homogeneous Catalysis", S. Kikkawa, Y. Fujiki, V. Chudatemiya, H. Nagakari, K. Shibusawa, J. Hirayama, N. Nakatani, S. Yamazoe, Angew. Chem. Int. Ed., 136, e202401526 (2024).

 

37. "Ultra-stable and highly reactive colloidal gold nanoparticle catalysts protected using multi-dentate metal oxide nanoclusters", K. Xia, T. Yatabe, K. Yonesato, S. Kikkawa, S. Yamazoe, A. Nakata, R. Ishikawa, N. Shibata, Y. Ikuhara, K. Yamaguchi, K. Suzuki, Nat. Commun., 15, 851 (2024).

 

36. "CO2 Activation on Lindqvist-type Polyoxotantalate: Structural Analysis by  In Situ HERFD-XANES", T. Matsuyama, S. Kikkawa, N. Kawamura, K. Higashi, N. Nakatani, K. Kato, S. Yamazoe, J. Phys. Chem. C, 128, 2953-2958 (2024).

 

35. "Redox-induced structural changes in Keggin-type tungstophosphate investigated by high-energy-resolution fluorescence detection X-ray absorption spectroscopy", T. Matsuyama, S. Kikkawa, N. Kawamura, K. Higashi, S. Yamazoe, Rad. Phys. Chem., 215, 111351 (2024).

 

34. "Development of Electrochemical Anion Doping Technique for Expansion of Functional Material Exploration", T. Katsumata, H. Yamamoto, Y. Kimura, K. Amezawa, R. Aso, S. Kikkawa, S. Yamazoe, T. Nakamura, Adv. Func. Mater., 33, 2307116 (2023).

 

33. "Redox Activity of IrIII Complexes with Multidentate Ligands Based on Dipyrido-annulated N-Heterocyclic Carbenes: Access to High Valent and High Spin State with Carbon Donors", K. Nakanishi, L.I. Lugo-Fuentes, J. Manabe, R. Guo, S. Kikkawa, S. Yamazoe, K. Komaguchi, S. Kume, D.W. Szczepanik, M. Solà, J.O.C. Jimenez-Halla, S. Nishihara, K. Kubo, M. Nakamoto, Y. Yamamoto, T. Mizuta, R. Shang , Chem. A Euro. J., 29, e202302303 (2023).

 

32. "Hydrogenation of CO2 over Mn-Substituted SrTiO3 Based on the Reverse Mars–van Krevelen Mechanism", H. Matsuo, M. Kobayashi, S. Naniwa, S. Iguchi, S. Kikkawa, H. Asakura, S. Hosokawa, T. Tanaka, K. Teramura, J. Phys. Chem. C, 127, 8946–8952 (2023).

 

31. “Carbon Nitride Loaded with an Ultrafine, Monodisperse, Metallic Platinum-Cluster Cocatalyst for the Photocatalytic Hydrogen-Evolution Reaction“, D. Yazaki, T. Kawawaki, D. Hirayama, M. Kawachi, K. Kato, S. Oguchi, Y. Yamaguchi, S. Kikkawa, Y. Ueki, S. Hossain, D. J. Osborn, F. Ozaki, S. Tanaka, J. Yoshinobu, G. F. Metha, S. Yamazoe, A. Kudo, A. Yamakata, Y. Negishi, Small, 2208287 (2023).

 

30. "Counteranion-induced structural isomerization of phosphine-protected PdAu8 and PtAu8 clusters", Y. Fujiki, T. Matsuyama, S. Kikkawa, J. Hirayama, H. Takaya, N. Nakatani, N. Yasuda, K. Nitta, Y. Negishi, S. Yamazoe, Commun. Chem., 6, 129 (2023).

 

29.  "Selective CO2 fixation reaction to styrene oxide by Ta-substitution of Lindqvist-type [(Ta,Nb)6O19]8- clusters", V. Chudatemiya, M. Tsukada, H. Nagakari, S. Kikkawa, J. Hirayama, N. Nakatani, T. Yamamoto, S. Yamazoe, Catalysts, 13, 442 (2023).

 

28.  "Improved activity for the oxygen evolution reaction using a tiara-like thiolate-protected nickel nanocluster", S. Funaki, T. Kawawaki, T. Okada, K. Takemae, S. Hossain, Y. Niihori, T. Naitoh, M. Takagi, T. Shimazaki, S. Kikkawa, S. Yamazoe, M. Tachikawa, Y. Negishi, Nanoscale, 15, 5201-5208.

 

27. "Size-Controlled Synthesis of Luminescent Few-Atom Silver Clusters via Electron Transfer in Isostructural Redox-Active Porous Ionic Crystals", N. Haraguchi, N. Ogiwara, Y. Kumabe, S. Kikkawa, S. Yamazoe, T. Tachikawa, S. Uchida, Small, 19, 2300743 (2023).

 

26. "Bifunctional platinum-incorporated polyoxoniobate derived catalyst for N-formylation of piperidine using CO_{2}", V. Chudatemiya, S. Kikkawa, J. Hirayama, R. Takahata, T. Teranishi, M. Tamura, S. Yamazoe, Asian J. Org. Chem., 12, e202200521 (2023).
 

25. "Transesterification of Methyl-10-Undecenoate and Poly(ethylene adipate) Catalyzed by (Cyclopentadienyl)Titanium Trichlorides as Model Chemical Conversions of Plant Oils and Acid-, Base-Free Chemical Recycling of Aliphatic Polyesters", K. Nomura, T. Aoki, Y. Ohki, S. Kikkawa, S. Yamazoe, ACS Sus. Chem. Eng., 10, 12504-12509 (2022).
 

24. "Dual functional catalysis of [Nb_{6}O_{19}]~{8-}-modified Au/Al_{2}O_{3}", S. Kikkawa, S. Fukuda, J. Hirayama, N. Shirai, R. Takahata, K. Suzuki, K. Yamaguchi, T. Teranishi, S. Yamazoe, Chem. Commun., 58, 9018-9021 (2022).
 

23. "Control over Ligand-Exchange Positions of Thiolate-Protected G」, K. Yonesato, S. Yamazoe, S. Kikkawa, D. Yokogawa, K. Yamaguchi, K. Suzuki, Chem. Sci., 144, 12310-12320 (2022).
 

22. "Supported Anionic Gold Nanoparticle Catalysts Modified Using Highly Negatively Charged Multivacant Polyoxometalates", K. Xia, T. Yatabe, K. Yonesato, T. Yabe, S. Kikkawa, S. Yamazoe, A. Nakata, K. Yamaguchi, K. Suzuki, Angew. Chem. Int. Ed., 134, e202205873 (2022).
 

21. "Formation of CH_{4} at the Metal-Support Interface of Pt/Al_{2}O_{3} During Hydrogenation of CO_{2}Operando XAS-DRIFTS Study", S. Kikkawa, K. Teramura, K. Kato, H. Asakura S. Hosokawa T. Tanaka, ChemCatChem, 14,e202101723 (2022).
 

20. "Direct Air Capture of CO_{2} Using a Liquid Amine-Solid Carbamic Acid Phase-Separation System Using Diamines Bearing an Aminocyclohexyl Group", S. Kikkawa, K. Amamoto, Y. Fujiki, J. Hirayama, G. Kato, H. Miura, T. Shishido, S. Yamazoe, ACS Environ. Au, 2, 354-362 (2022).
 

19. "In situ time-resolved XAS study on metal-support-interaction-induced morphology change of PtO_{2} nanoparticles supported on γ-Al_{2}O_{3} under H_{2} reduction", S. Kikkawa, K. Teramura, H. Asakura S. Hosokawa T. Tanaka, Catal. Today, 410, 157-163 (2022).
 

18. "Variable control of the electronic states of a silver nanocluster via protonation/deprotonation of polyoxometalate ligands", K. Yonesato, S. Yamazoe, S. Kikkawa, D. Yokogawa, K. Yamaguchi, K. Suzuki, Chem. Sci., 13, 5557-5561 (2022).
 

17. "Simple and High-Yield Preparation of Carbon-Black-Supported ~1-nm Platinum Nanoclusters and Their Oxygen Reduction Reactivity", T. Kawawaki, N. Shimizu, K. Funai, Y. Mitomi, S. Hossain, S. Kikkawa, D.J. Osborn, S. Yamazoe, G.F. Metha, Y. Negishi, Nanoscale, 13, 14679-14687 (2021).
 

16. "Thermal stability of crown-motif [Au_{9}(PPh_{3})_{8}]~{3+} and [MAu_{9}(PPh_{3})_{8}]~{2+} (M = Pd, Pt) clusters: Effects of gas composition, single-atom doping, and counter anions", T. Matsuyama, S. Kikkawa, Y. Fujiki, M. Tsukada, H. Takaya, N. Yasuda, K. Nitta, N. Nakatani, Y. Negishi, S. Yamazoe, J. Chem. Phys., 155, 044307 (2021).
 

15. "Base Catalysis of Sodium Salts of [Ta_{6-x}Nb_{x}O_{19}]~{8-} Mixed-Oxide Clusters", S. Kikkawa, M. Tsukada, K. Shibata, Y. Fujiki, K. Shibusawa, J. Hirayama, N. Nakatani, T. Yamamoto, S. Yamazoe, Symmetry, 13, 1267 (2021).
 

14. "Creation of High-Performance Heterogeneous Photocatalysts by Controlling Ligand Desorption and Particle Size of Gold Nanocluster", Y. Negishi, T. Kawawaki, Y. Kataoka, M. Hirata, Y. Akinaga, R. Takahata, K. Wakamatsu, Y. Fujiki, M. Kataoka, S. Kikkawa, A.S. Alotabi, S. Hossain, D.J. Osborn, T. Teranishi, G.G. Andersson, G.F. Metha, S. Yamazoe, Angew. Chem. Int. Ed., 60, 21340-21350 (2021).
 

13. "Observation of adsorbed hydrogen species on supported metal catalysts by inelastic neutron scattering", H. Yoshida, A. Yamamoto, S. Hosokawa, S. Yamazoe, S. Kikkawa, K. Hara, M. Nakamura, K. Kamazawa, T. Tanaka, Top. Catal., 64, 660-671 (2021).
 

12. "Formation of Mixed-Valence Luminescent Silver Clusters via Cation-Coupled Electron-Transfer in a Redox-Active Ionic Crystal Based on a Dawson-type Polyoxometalate with Closed Pores", N. Haraguchi, T. Okunaga, N. Ogiwara, S. Kikkawa, S. Yamazoe, M. Inada, T. Tachikawa, S. Uchida, Eur. J. Inorg. Chem., 2021, 1531-1535 (2021).
 

11. "Effect of Ligand on Electronic State of Gold in Ligand-Protected Gold Clusters Elucidated by X-ray Absorption Spectroscopy", T. Matsuyama, J. Hirayama, Y. Fujiki, S. Kikkawa, W. Kurashige, H. Asakura, N. Kawamura, Y. Negishi, N. Nakatani, K. Hatada, F. Ota, S. Yamazoe, J. Phys. Chem. C, 125, 3143-3149 (2021).
 

10. "Fe-Modified CuNi Alloy Catalyst as a Nonprecious Metal Catalyst for Three-Way Catalysis", H. Asakura, M. Kirihara, K. Fujita, S. Hosokawa, S. Kikkawa, K. Teramura, T. Tanaka, Ind. Eng. Chem. Res., 59, 19907-19917 (2020).
 

9. "Ni-Pt Alloy Nanoparticles with Isolated Pt Atoms and Their Cooperative Neighboring Ni Atoms for Selective Hydrogenation of CO_{2} Toward CH_{4} Evolution: In Situ and Transient Fourier Transform Infrared Studies", S. Kikkawa, K. Teramura, H. Asakura, S. Hosokawa, T. Tanaka, ACS Appl. Nano Mater., 3, 9633-9644 (2020).
 

8. "Effect of Surface Reforming via O_{3} Treatment on the Electrochemical CO_{2} Reduction Activity of a Ag Cathode", M. Ishida, S. Kikkawa, K. Hori, K. Teramura, H. Asakura, S. Hosokawa, T. Tanaka, ACS Appl. Energy Mater., 3, 6552-6560 (2020).
 

7. "Imparting CO_{2} reduction selectivity to ZnGa_{2}O_{4} photocatalysts by crystallization from hetero nano assembly of amorphous-like metal hydroxides", M. Takemoto, Y. Tokudome, S. Kikkawa, K. Teramura, T. Tanaka, K. Okada, H. Murata, A. Nakahira, M. Takahashi, RSC Adv., 10, 8066-8073 (2020).
 

6. "Photoelectrochemical Investigation of the Role of Surface-Modified Yb Species in the Photocatalytic Conversion of CO_{2} by H_{2}O over Ga_{2}O_{3} Photocatalysts", S. Kikkawa, Y. Nakatani, K. Teramura, H. Asakura, S. Hosokawa, T. Tanaka, Catal. Today, 352, 18-26 (2020).
 

5. "Isolated Platinum Atoms in Ni/gamma-Al_{2}O_{3} for Selective Hydrogenation of CO_{2} toward CH_{4} ", S. Kikkawa, K. Teramura, H. Asakura, S. Hosokawa, T. Tanaka, J. Phys. Chem. C, 123, 23446-23454 (2019).
 

4. "Development of Rh-Doped Ga_{2}O_{3} Photocatalysts for Reduction of CO_{2} by H_{2}O as an Electron Donor at a More than 300 nm Wavelength ", S. Kikkawa, K. Teramura, H. Asakura, S. Hosokawa, T. Tanaka, J. Phys. Chem. C, 122, 21132-21139 (2018).
 

3. "Drastic improvement in the photocatalytic activity of Ga_{2}O_{3} modified with Mg-Al layered double hydroxide for the conversion of CO_{2} in water", S. Iguchi, Y. Hasegawa, K. Teramura, S. Kidera, S. Kikkawa, S. Hosokawa, H. Asakura, T. Tanaka, Sustainable Energy Fuels, 1, 1740-1747 (2017).
 

2. "Monolayer Tantalum Oxide on Mesoporous Silica Substrate", J.N. Kondo, H. Yamazaki, A. Ishikawa, R. Osuga, S. Takao, T. Yokoi, S. Kikkawa, K. Teramura, T. Tanaka, ChemistrySelect, 1, 3124-3131 (2016).
 

1. "Investigation of the electrochemical and photoelectrochemical properties of Ni-Al LDH photocatalysts ", S. Iguchi, S. Kikkawa, K. Teramura, S. Hosokawa, T. Tanaka, Phys. Chem. Chem. Phys., 18, 13811-13819 (2016).