H
Hirofumi Yoshikawa
Researcher at Kwansei Gakuin University
Publications - 161
Citations - 4820
Hirofumi Yoshikawa is an academic researcher from Kwansei Gakuin University. The author has contributed to research in topics: Bacillus subtilis & Gene. The author has an hindex of 36, co-authored 144 publications receiving 4171 citations. Previous affiliations of Hirofumi Yoshikawa include Ivanovo State University & University of Tokyo.
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In Operando X-ray Absorption Fine Structure Studies of Polyoxometalate Molecular Cluster Batteries: Polyoxometalates as Electron Sponges
Heng Wang,Shun Hamanaka,Yoshio Nishimoto,Stephan Irle,Toshihiko Yokoyama,Hirofumi Yoshikawa,Kunio Awaga +6 more
TL;DR: X-ray absorption near-edge structure analyses demonstrate the formation of a super-reduced state of the POM, namely, [PMo(12)O(40)](27-), which stores 24 electrons, and this electron number can explain the large capacity of thePOM-MCBs.
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Exceptional dielectric phase transitions in a perovskite-type cage compound.
TL;DR: This work presents a novel organic–inorganic hybrid cage compound (HIm)2[KFe(CN)6] (1; HIm = imidazolium) with a perovskite-type structure, in which the order– disorder behavior of the HIm polar guests give rise to striking dielectric anomalies.
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Monitoring the Solid-State Electrochemistry of Cu(2,7-AQDC) (AQDC = Anthraquinone Dicarboxylate) in a Lithium Battery: Coexistence of Metal and Ligand Redox Activities in a Metal–Organic Framework
TL;DR: This MOF is the first example of a porous material showing independent redox activity on both metal cluster nodes and ligand sites, suggesting the framework was robust.
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Preparation, photocatalytic activities, and dye-sensitized solar-cell performance of submicron-scale TiO2 hollow spheres.
Yoshihiko Kondo,Hirofumi Yoshikawa,Kunio Awaga,Masaki Murayama,Mori Tatsuo,Kayano Sunada,Shunji Bandow,Sumio Iijima +7 more
TL;DR: The photocatalytic property was investigated by the complete decomposition of gaseous isopropyl alcohol under UV irradiation, and it was indicated that the activity of the hollow spheres was 1.8 times higher than that of the conventional P25 TiO2 nanoparticles with a diameter of 30 nm.
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Nanohybridization of Polyoxometalate Clusters and Single‐Wall Carbon Nanotubes: Applications in Molecular Cluster Batteries
Naoya Kawasaki,Heng Wang,Ryo Nakanishi,Shun Hamanaka,Ryo Kitaura,Hisanori Shinohara,Toshihiko Yokoyama,Hirofumi Yoshikawa,Kunio Awaga +8 more
TL;DR: In this paper, MeCN solution of the polyoxometalate was added to a toluene suspension of the nanotubes under vigorous stirring at room temperature, and the mixture was grafted onto the surface of single-wall carbon nanotube.