Kyoto Research Park

Kyoto, Japan

Kyoto Research Park

Kyoto, Japan
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Maruyama J.,Osaka Municipal Technical Research Institute | Hasegawa T.,Osaka Municipal Technical Research Institute | Iwasaki S.,Osaka Municipal Technical Research Institute | Fukuhara T.,Osaka Municipal Technical Research Institute | Nogami M.,Kyoto Research Park
Journal of the Electrochemical Society | Year: 2013

The reduction of dioxovanadium(5+) ion (VO2 +) was fundamentally investigated using glassy carbon rotating disk electrodes (GC RDEs) as a model of the carbon electrodes of vanadium redox flow batteries (VRFBs). The enrichment of oxygen-containing functional groups on the GC surface was performed by the electrochemical oxidation and checked by X-ray photoelectron spectroscopy (XPS). The XPS results also suggested the coordination of the functional groups to the oxo/dioxovanadium(4+/5+) ions (VO2+/VO2+) after immersion into the VO2+/VO2+-dissolved solution. The enrichment enhanced the VO2+ reduction and changed the Tafel slope from -0.161 V decade-1 to -0.087 V decade-1, indicating the reduction mechanism alteration. The Tafel slope was explained by a multi-step reaction mechanism, in which the reduction of the quinone-like functional group generated the hydroxylic functional group that served as the reaction site and coordinated to the oxo/dioxovanadium(4+/5+) species. © 2013, The Electrochemical Society, Inc. All rights reserved.

Shimomura S.,Kyoto University | Higuchi M.,RIKEN | Matsuda R.,Kyoto Research Park | Matsuda R.,Kyoto University | And 11 more authors.
Nature Chemistry | Year: 2010

Porous coordination polymers are materials formed from metal ions that are bridged together by organic linkers and that can combine two seemingly contradictory properties-crystallinity and flexibility. Porous coordination polymers can therefore create highly regular yet dynamic nanoporous domains that are particularly promising for sorption applications. Here, we describe the effective selective sorption of dioxygen and nitric oxide by a structurally and electronically dynamic porous coordination polymer built from zinc centres and tetracyanoquinodimethane (TCNQ) as a linker. In contrast to a variety of other gas molecules (C2 H2, Ar, CO2, N2 and CO), O2 and NO are accommodated in its pores. This unprecedented preference arises from the concerted effect of the charge-transfer interaction between TCNQ and these guests, and the switchable gate opening and closing of the pores of the framework. This system provides further insight into the efficient recognition of small gas molecules. © 2010 Macmillan Publishers Limited. All rights reserved.

Kanoo P.,Jawaharlal Nehru Centre for Advanced Scientific Research | Mostafa G.,Jadavpur University | Matsuda R.,Kyoto Research Park | Matsuda R.,Kyoto University | And 3 more authors.
Chemical Communications | Year: 2011

A new 2D pillared-bilayer porous coordination polymer (PCP) has been synthesized and structurally characterized that shows selective adsorption of CO2 over other gases (N2, O2, Ar, H 2, CH4) and guest selective single/double-step adsorption of vapor correlated to the successive confinement of adsorbates in a 1D channel and a 2D interlayer space. © 2011 The Royal Society of Chemistry.

Foo M.L.,Kyoto University | Foo M.L.,Kyoto Research Park | Matsuda R.,Kyoto University | Matsuda R.,Kyoto Research Park | And 2 more authors.
Chemistry of Materials | Year: 2014

Porous coordination polymers (PCPs) have attracted vast interest in recent years because of their possibility for rational design of crystal structures and functional properties. An emerging trend in PCP research is hybridization, which is the subject of this review. We have divided hybrid PCPs into three broad classes: class I, isomorphous mixed metal/ligand PCPs; class II, core@shell PCPs; class III, PCPâŠguest or PCPs with accommodated guests. In this Review, we examine 62 representative hybrid PCPs in the area of gas adsorption/separation/storage, luminescence, catalysis, drug delivery, and ionic conductivity with representative examples of each class to understand the underlying principles of hybridization for PCPs and their advantages over conventional PCPs. The future directions and applications of hybrid PCPs are postulated. © 2013 American Chemical Society.

Lin L.,Kyoto Research Park | Yamaguchi H.,Kyoto Research Park | Suzuki A.,Kyoto Research Park
RSC Advances | Year: 2013

A mixed solvent of 1-butyl-3-methylimidazolium chloride ([bmim]Cl) and dimethylacetamide (DMAc) was developed for various applications involving cellulose. By changing the ratio of DMAc, the mixed solvent could be used either for cellulose swelling (more than 65% DMAc), selective dissolution of the non-crystalline domains for extraction of the crystalline nanofibers of cellulose (35-60% DMAc), or complete dissolution (less than 30% DMAc). In the region of complete dissolution, the dissolution rate of cellulose increased drastically as the DMAc ratio increased. The cellulose nanofibers prepared in the mixed solvent of [bmim]Cl-DMAc (50% DMAc) had a diameter of 30 nm and maintained the crystalline structure of cellulose I. A model was proposed to describe the selective dissolution and fibrillation of cellulose nanofibers in the mixed solvent of [bmim]Cl-DMAc. This journal is © The Royal Society of Chemistry 2013.

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