The Experts below are selected from a list of 1062 Experts worldwide ranked by ideXlab platform
Nobuhito Imanaka - One of the best experts on this subject based on the ideXlab platform.
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highly conducting divalent mg2 Cation solid electrolytes with well ordered three dimensional network structure
Journal of Solid State Chemistry, 2016Co-Authors: Shinji Tamura, Megumi Yamane, Yasunori Hoshino, Nobuhito ImanakaAbstract:Abstract A three-dimensionally well-ordered NASICON-type Mg 2+ Cation Conductor, (Mg x Hf 1− x ) 4/(4−2 x ) Nb(PO 4 ) 3 , was firstly developed by partial substitution of lower valent Mg 2+ Cation onto the Hf 4+ sites in a HfNb(PO 4 ) 3 solid to realize high Mg 2+ Cation conductivity even at moderate temperatures. Due to the formation of well-ordered NASICON-type structure, both the high Mg 2+ Cation conductivity below 450 °C and the low activation energy for Mg 2+ Cation migration was successfully realized for the (Mg 0.1 Hf 0.9 ) 4/3.8 Nb(PO 4 ) 3 solid. Pure Mg 2+ Cation conduction in the NASICON-type (Mg 0.1 Hf 0.9 ) 4/3.8 Nb(PO 4 ) 3 solid was directly and quantitatively demonstrated by means of two kinds of dc electrolysis.
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Tetravalent Zr^4+ ion conduction in NASICON-type phosphate solids
Journal of Solid State Electrochemistry, 2003Co-Authors: Nobuhito Imanaka, Tomohiro Ueda, Gin-ya AdachiAbstract:The ionic conduction of mono-, di-, and trivalent ions in solids is popular in solid state science and the next target ion species to migrate in solids are tetravalent ions. Here, a tetravalent Cation Conductor which shows high conductivity, comparable to the conductivity range of the representative divalent oxide anion Conductors, was artificially designed by strictly selecting the constituent elements and the structure. The tetravalent ion conducting solid electrolyte proposed here shows considerable high ion conductivity and promising appliCations, such as in rechargeable batteries and chemical sensors for global environmental monitoring, are greatly expected.
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Tetravalent Zr4+ ion conduction in NASICON-type phosphate solids
Journal of Solid State Electrochemistry, 2003Co-Authors: Nobuhito Imanaka, Tomohiro Ueda, Gin-ya AdachiAbstract:The ionic conduction of mono-, di-, and trivalent ions in solids is popular in solid state science and the next target ion species to migrate in solids are tetravalent ions. Here, a tetravalent Cation Conductor which shows high conductivity, comparable to the conductivity range of the representative divalent oxide anion Conductors, was artificially designed by strictly selecting the constituent elements and the structure. The tetravalent ion conducting solid electrolyte proposed here shows considerable high ion conductivity and promising appliCations, such as in rechargeable batteries and chemical sensors for global environmental monitoring, are greatly expected.
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First identifiCation of tetravalent Hf4+ ion-conducting solid
Materials Letters, 2002Co-Authors: Nobuhito Imanaka, M Itaya, G. AdachiAbstract:Abstract A new tetravalent Cation Conductor, whose Hf4+ ion conductivity is the highest among the tetravalent ion-conducting solids and shows an extraordinary high and comparable conductivity to the representative divalent oxide anion Conductor series, was artificially designed by strictly choosing the structure and the constituent elements. Since the solid electrolyte shows considerable high ion-conducting characteristics, promising appliCations like rechargeable batteries and chemical sensors for an environmental gas monitoring are greatly expected.
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Extraordinary High Tetravalent Cation Conducting Behaviors in Solid
Chemistry Letters, 2001Co-Authors: Nobuhito Imanaka, Tomohiro Ueda, Gin-ya AdachiAbstract:A tetravalent Cation Conductor whose ionic conductivity is extraordinary high and comparable to the conductivity range of the representative divalent oxide anion Conductors, was artificially designed by strictly choosing the constituent elements and the structure of the solid. Promising appliCations such as rechargeable batteries and chemical sensors for a global environmental monitoring, are greatly expected.
Gin-ya Adachi - One of the best experts on this subject based on the ideXlab platform.
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Tetravalent Zr^4+ ion conduction in NASICON-type phosphate solids
Journal of Solid State Electrochemistry, 2003Co-Authors: Nobuhito Imanaka, Tomohiro Ueda, Gin-ya AdachiAbstract:The ionic conduction of mono-, di-, and trivalent ions in solids is popular in solid state science and the next target ion species to migrate in solids are tetravalent ions. Here, a tetravalent Cation Conductor which shows high conductivity, comparable to the conductivity range of the representative divalent oxide anion Conductors, was artificially designed by strictly selecting the constituent elements and the structure. The tetravalent ion conducting solid electrolyte proposed here shows considerable high ion conductivity and promising appliCations, such as in rechargeable batteries and chemical sensors for global environmental monitoring, are greatly expected.
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Tetravalent Zr4+ ion conduction in NASICON-type phosphate solids
Journal of Solid State Electrochemistry, 2003Co-Authors: Nobuhito Imanaka, Tomohiro Ueda, Gin-ya AdachiAbstract:The ionic conduction of mono-, di-, and trivalent ions in solids is popular in solid state science and the next target ion species to migrate in solids are tetravalent ions. Here, a tetravalent Cation Conductor which shows high conductivity, comparable to the conductivity range of the representative divalent oxide anion Conductors, was artificially designed by strictly selecting the constituent elements and the structure. The tetravalent ion conducting solid electrolyte proposed here shows considerable high ion conductivity and promising appliCations, such as in rechargeable batteries and chemical sensors for global environmental monitoring, are greatly expected.
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Extraordinary High Tetravalent Cation Conducting Behaviors in Solid
Chemistry Letters, 2001Co-Authors: Nobuhito Imanaka, Tomohiro Ueda, Gin-ya AdachiAbstract:A tetravalent Cation Conductor whose ionic conductivity is extraordinary high and comparable to the conductivity range of the representative divalent oxide anion Conductors, was artificially designed by strictly choosing the constituent elements and the structure of the solid. Promising appliCations such as rechargeable batteries and chemical sensors for a global environmental monitoring, are greatly expected.
Frank Marken - One of the best experts on this subject based on the ideXlab platform.
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Switching Anionic and Cationic Semipermeability in Partially Hydrolyzed Polyacrylonitrile: A pH-Tunable Ionic Rectifier
ACS applied materials & interfaces, 2020Co-Authors: Luthando Tshwenya, Frank Marken, Klaus Mathwig, Omotayo A. ArotibaAbstract:Membrane materials with semipermeability for anions or for Cations are of interest in electrochemical and nanofluidic separation and purifiCation technologies. In this study, partially hydrolyzed polyacrylonitrile (phPAN) is investigated as a pH-switchable anion/Cation Conductor. When switching from anionic to Cationic semipermeability, also the ionic current rectifiCation effect switches for phPAN materials deposited asymmetrically onto a 5, 10, 20, or 40 μm diameter microhole in a 6 μm thick polyethylene-terephthalate (PET) film substrate. Therefore, ionic rectifier behavior can be tuned and used to monitor and characterize semipermeability. Effects of electrolyte type and concentration and pH (relative to the zeta potential at approximately 3.1) are investigated by voltammetry, chronoamperometry, and impedance spectroscopy. A computational model provides good qualitative agreement with the observed electrolyte concentration data. High rectifiCation effects are observed for both Cations (pH > 3.1) and a...
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potassium Cation induced ionic diode blocking for a polymer of intrinsic microporosity nafion heterojunction on a microhole substrate
Electrochimica Acta, 2017Co-Authors: Mariolino Carta, Budi Riza Putra, Richard Malpassevans, Neil B Mckeown, Frank MarkenAbstract:Abstract “Heterojunction” ionic diodes based on a Nafion Cation Conductor and a polymer of intrinsic microporosity (PIM) interfaced at a 6 μm thickness polyethylene-terephthalate (PET) film with 20 μm diameter microhole exhibit rectifiCation effects in Cation (K+) flux. When combined with the precipitation reaction of potassium Cations with perchlorate anions to give insoluble KClO4 (solubility product ca. 1.05 × 10−2 M2 at 25 °C) at the PIM | Nafion interface, inversion of the rectifiCation/diode effect occurs and the formerly “open” state changes into a “closed” state due to blocking of ion flow. The localised interfacial precipitation reaction is due to up to three orders of magnitude accumulation of K+ at the PIM | Nafion interface and shown to be fast and reversible. The effects of K+/ClO4− concentration and of Na+ interference are considered. The blocking process within the heterojunction ionic diode is suggested to be dynamic/fast and potentially useful as a diode sensor mechanism based on solubility product dependent precipitation.
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Potassium Cation induced ionic diode blocking for a polymer of intrinsic microporosity | nafion “heterojunction” on a microhole substrate
Electrochimica Acta, 2017Co-Authors: Budi Riza Putra, Mariolino Carta, Neil B Mckeown, Richard Malpass-evans, Frank MarkenAbstract:Abstract “Heterojunction” ionic diodes based on a Nafion Cation Conductor and a polymer of intrinsic microporosity (PIM) interfaced at a 6 μm thickness polyethylene-terephthalate (PET) film with 20 μm diameter microhole exhibit rectifiCation effects in Cation (K+) flux. When combined with the precipitation reaction of potassium Cations with perchlorate anions to give insoluble KClO4 (solubility product ca. 1.05 × 10−2 M2 at 25 °C) at the PIM | Nafion interface, inversion of the rectifiCation/diode effect occurs and the formerly “open” state changes into a “closed” state due to blocking of ion flow. The localised interfacial precipitation reaction is due to up to three orders of magnitude accumulation of K+ at the PIM | Nafion interface and shown to be fast and reversible. The effects of K+/ClO4− concentration and of Na+ interference are considered. The blocking process within the heterojunction ionic diode is suggested to be dynamic/fast and potentially useful as a diode sensor mechanism based on solubility product dependent precipitation.
Budi Riza Putra - One of the best experts on this subject based on the ideXlab platform.
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potassium Cation induced ionic diode blocking for a polymer of intrinsic microporosity nafion heterojunction on a microhole substrate
Electrochimica Acta, 2017Co-Authors: Mariolino Carta, Budi Riza Putra, Richard Malpassevans, Neil B Mckeown, Frank MarkenAbstract:Abstract “Heterojunction” ionic diodes based on a Nafion Cation Conductor and a polymer of intrinsic microporosity (PIM) interfaced at a 6 μm thickness polyethylene-terephthalate (PET) film with 20 μm diameter microhole exhibit rectifiCation effects in Cation (K+) flux. When combined with the precipitation reaction of potassium Cations with perchlorate anions to give insoluble KClO4 (solubility product ca. 1.05 × 10−2 M2 at 25 °C) at the PIM | Nafion interface, inversion of the rectifiCation/diode effect occurs and the formerly “open” state changes into a “closed” state due to blocking of ion flow. The localised interfacial precipitation reaction is due to up to three orders of magnitude accumulation of K+ at the PIM | Nafion interface and shown to be fast and reversible. The effects of K+/ClO4− concentration and of Na+ interference are considered. The blocking process within the heterojunction ionic diode is suggested to be dynamic/fast and potentially useful as a diode sensor mechanism based on solubility product dependent precipitation.
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Potassium Cation induced ionic diode blocking for a polymer of intrinsic microporosity | nafion “heterojunction” on a microhole substrate
Electrochimica Acta, 2017Co-Authors: Budi Riza Putra, Mariolino Carta, Neil B Mckeown, Richard Malpass-evans, Frank MarkenAbstract:Abstract “Heterojunction” ionic diodes based on a Nafion Cation Conductor and a polymer of intrinsic microporosity (PIM) interfaced at a 6 μm thickness polyethylene-terephthalate (PET) film with 20 μm diameter microhole exhibit rectifiCation effects in Cation (K+) flux. When combined with the precipitation reaction of potassium Cations with perchlorate anions to give insoluble KClO4 (solubility product ca. 1.05 × 10−2 M2 at 25 °C) at the PIM | Nafion interface, inversion of the rectifiCation/diode effect occurs and the formerly “open” state changes into a “closed” state due to blocking of ion flow. The localised interfacial precipitation reaction is due to up to three orders of magnitude accumulation of K+ at the PIM | Nafion interface and shown to be fast and reversible. The effects of K+/ClO4− concentration and of Na+ interference are considered. The blocking process within the heterojunction ionic diode is suggested to be dynamic/fast and potentially useful as a diode sensor mechanism based on solubility product dependent precipitation.
Tomohiro Ueda - One of the best experts on this subject based on the ideXlab platform.
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Tetravalent Zr^4+ ion conduction in NASICON-type phosphate solids
Journal of Solid State Electrochemistry, 2003Co-Authors: Nobuhito Imanaka, Tomohiro Ueda, Gin-ya AdachiAbstract:The ionic conduction of mono-, di-, and trivalent ions in solids is popular in solid state science and the next target ion species to migrate in solids are tetravalent ions. Here, a tetravalent Cation Conductor which shows high conductivity, comparable to the conductivity range of the representative divalent oxide anion Conductors, was artificially designed by strictly selecting the constituent elements and the structure. The tetravalent ion conducting solid electrolyte proposed here shows considerable high ion conductivity and promising appliCations, such as in rechargeable batteries and chemical sensors for global environmental monitoring, are greatly expected.
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Tetravalent Zr4+ ion conduction in NASICON-type phosphate solids
Journal of Solid State Electrochemistry, 2003Co-Authors: Nobuhito Imanaka, Tomohiro Ueda, Gin-ya AdachiAbstract:The ionic conduction of mono-, di-, and trivalent ions in solids is popular in solid state science and the next target ion species to migrate in solids are tetravalent ions. Here, a tetravalent Cation Conductor which shows high conductivity, comparable to the conductivity range of the representative divalent oxide anion Conductors, was artificially designed by strictly selecting the constituent elements and the structure. The tetravalent ion conducting solid electrolyte proposed here shows considerable high ion conductivity and promising appliCations, such as in rechargeable batteries and chemical sensors for global environmental monitoring, are greatly expected.
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Extraordinary High Tetravalent Cation Conducting Behaviors in Solid
Chemistry Letters, 2001Co-Authors: Nobuhito Imanaka, Tomohiro Ueda, Gin-ya AdachiAbstract:A tetravalent Cation Conductor whose ionic conductivity is extraordinary high and comparable to the conductivity range of the representative divalent oxide anion Conductors, was artificially designed by strictly choosing the constituent elements and the structure of the solid. Promising appliCations such as rechargeable batteries and chemical sensors for a global environmental monitoring, are greatly expected.