Search results for: Tatsumi Ishihara

Items from 1 to 20 out of 210 results

article

Fe₂O₃ powder modified with Ce_0.6Mn_0.3Fe_0.1O₂ and Cr₂O₃ prepared by spray pyrolysis method for rechargeable Fe–air cell

Tatsumi Ishihara, Hackho Kim, Yuiko Inoishi, Junko Matsuda

Journal of the American Ceramic Society > 105 > 11 > 6718 - 6731

Highly porous and uniform sphere shape Fe powder with a nano‐porous structure can be prepared successfully with a spray pyrolysis method and applied for solid oxide Fe–air rechargeable battery, which is consisted of solid oxide reversible cells using an H₂O/H₂redox mediator. The prepared Fe powder modified with both Cr₂O₃and Ce_0.6Mn_0.3Fe_0.1O₂ shows a high redox reaction rate as well as cycle stability...

article

[2.2]‐ and [3.3]Paracyclophane as Bridging Units in Organic Dyads for Visible‐Light‐Driven Dye‐Sensitized Hydrogen Production

Motonori Watanabe, Yuka Ono, Tatsumi Ishihara, Yuan Jay Chang, more

Chemistry – A European Journal > 28 > 43 > n/a - n/a

Novel donor–acceptor dyads containing [2.2]‐ and [3.3]paracyclophane (PCP) as the bridging moiety were synthesized and used to effectively fabricate dye‐sensitized hydrogen production systems. All the prepared compounds had a phenothiazine and a cyanoacrylic acid/pyridinyl acrylonitrile moiety acting as an electron donor and acceptor, respectively. Although cyclic voltammetry measurements showed similar...

article

Correlating Surface Crystal Orientation and Gas Kinetics in Perovskite Oxide Electrodes

Ran Gao, Abel Fernandez, Tanmoy Chakraborty, Aileen Luo, more

Advanced Materials > 33 > 20 > n/a - n/a

Solid–gas interactions at electrode surfaces determine the efficiency of solid‐oxide fuel cells and electrolyzers. Here, the correlation between surface–gas kinetics and the crystal orientation of perovskite electrodes is studied in the model system La_0.8Sr_0.2Co_0.2Fe_0.8O₃. The gas‐exchange kinetics are characterized by synthesizing epitaxial half‐cell geometries where three single‐variant surfaces...

article

High‐pressure torsion of SiO₂ quartz sand: Phase transformation, optical properties, and significance in geology

Qing Wang, Kaveh Edalati, Ikuro Fujita, Motonori Watanabe, more

Journal of the American Ceramic Society > 103 > 11 > 6594 - 6602

Phase transformation and optical properties of silica (silicon dioxide, SiO₂) quartz sand under high pressure/temperature has been of interest in geology and optical physics for many years. In this study, besides high pressure/temperature, high plastic strain is simultaneously applied to the quartz sand by high‐pressure torsion (HPT) processing. The material shows oxygen vacancy formation and transformation...

article

A CO₂‐Tolerant Perovskite Oxide with High Oxide Ion and Electronic Conductivity

Ming Li, Hongjun Niu, John Druce, Helena Téllez, more

Advanced Materials > 32 > 4 > n/a - n/a

Mixed ionic–electronic conductors (MIECs) that display high oxide ion conductivity (σ_o) and electronic conductivity (σ_e) constitute an important family of electrocatalysts for a variety of applications including fuel cells and oxygen separation membranes. Often MIECs exhibit sufficient σ_e but inadequate σ_o. It has been a long‐standing challenge to develop MIECs with both high σ_o and stability under...

article

Designing Optimal Perovskite Structure for High Ionic Conduction

Ran Gao, Abhinav C. P. Jain, Shishir Pandya, Yongqi Dong, more

Advanced Materials > 32 > 1 > n/a - n/a

Solid‐oxide fuel/electrolyzer cells are limited by a dearth of electrolyte materials with low ohmic loss and an incomplete understanding of the structure–property relationships that would enable the rational design of better materials. Here, using epitaxial thin‐film growth, synchrotron radiation, impedance spectroscopy, and density‐functional theory, the impact of structural parameters (i.e., unit‐cell...

article

A Cocatalyst that Stabilizes a Hydride Intermediate during Photocatalytic Hydrogen Evolution over a Rhodium‐Doped TiO₂ Nanosheet

Shintaro Ida, Kenta Sato, Tetsuya Nagata, Hidehisa Hagiwara, more

Angewandte Chemie > 130 > 29 > 9211 - 9215

The hydrogen evolution reaction using semiconductor photocatalysts has been significantly improved by cocatalyst loading. However, there are still many speculations regarding the actual role of the cocatalyst. Now a photocatalytic hydrogen evolution reaction pathway is reported on a cocatalyst site using TiO₂ nanosheets doped with Rh at Ti sites as one‐atom cocatalysts. A hydride species adsorbed...

article

A Cocatalyst that Stabilizes a Hydride Intermediate during Photocatalytic Hydrogen Evolution over a Rhodium‐Doped TiO₂ Nanosheet

Shintaro Ida, Kenta Sato, Tetsuya Nagata, Hidehisa Hagiwara, more

Angewandte Chemie International Edition > 57 > 29 > 9073 - 9077

article

Pt‐Rh/TiO₂/activated carbon as highly active and stable HI decomposition catalyst for hydrogen production in sulfur‐iodine (SI) process

Wachirapun Punkrawee, Azusa Yamanaka, Junko Matsuda, Yukiko Mitoma, more

International Journal of Energy Research > 42 > 7 > 2494 - 2506

Pt‐TiO₂ loaded on activated carbon was studied as an active and stable catalyst to HI decomposition for H₂ formation in the sulfur‐iodine process. Although the activity of TiO₂‐loaded catalyst was slightly lower HI conversion than that of CeO₂ loaded one, the higher stability against HI decomposition reaction was achieved and almost equilibrium conversion was sustained over ~65 h examined. Moreover,...

article

Pt‐Ce_0.9Cu_0.1O₂/activated carbon as highly active and stable HI decomposition catalyst

Wachirapun Punkrawee, Azusa Yamanaka, Junko Matsuda, Yukiko Mitoma, more

International Journal of Energy Research > 42 > 3 > 1088 - 1097

Effects of additives to Pt‐CeO₂/activated carbon (M563) catalysts on HI decomposition were studied. Among the additives studied, it was found that the addition of Cu to Pt‐CeO₂ is the most effective for increasing the catalytic activity to HI decomposition. On this catalyst, almost the equilibrium hydrogen iodide (HI) conversion was achieved at temperature higher than 573 K. Cu addition increased...

article

Reduction mechanism of selective NO reduction on Pd-NiO/(Y0.99Ba0.01)2O3 catalyst

Lin Liu, Tatsumi Ishihara

Applied Catalysis A: General > 2018 > 550 > C > 90-97

Y(Ba)₂O₃ catalyst loaded with 1wt% Pd and 3.2wt% NiO, Pd-NiO/(Y_0.99Ba_0.01)₂O₃, was found to be highly active to the selective reduction of NO with C₃H₆. The adsorption of NO on both (Y_0.99Ba_0.01)₂O₃ and Pd-NiO loaded one was studied using temperature-programmed desorption, pulsed reaction analysis and in-situ Fourier transform infrared (FTIR) spectroscopy. It was determined that NO is readily adsorbed...

article

[FeFe]-Hydrogenase and its organic molecule mimics—Artificial and bioengineering application for hydrogenproduction

Motonori Watanabe, Yuki Honda, Hidehisa Hagiwara, Tatsumi Ishihara

Journal of Photochemistry and Photobiology C: Photochemistry Reviews > 2017 > 33 > C > 1-26

This study focuses on [FeFe]-hydrogenase and its metallorganic mimics in terms of electronic and photophysical properties, which can be applied to the electrochemical and/or photochemical production of molecular hydrogen. Natural [FeFe]-hydrogenase, synthetic mimics of its active site and recent progresses in hybrid-type hydrogen production, for example, inorganic-combination photoelectrochemical...

article

Effects of preparation condition on the photocatalytic activity of porphyrin-modified GaN:ZnO for water splitting

Hidehisa Hagiwara, Ryota Kakigi, Shuhei Takechi, Motonori Watanabe, more

Surface and Coatings Technology > 2017 > 324 > C > 601-606

Effects of nitridation condition on gallium-zinc oxynitride solid solution (GaN:ZnO) was investigated to optimize the composition of GaN:ZnO for dye-modified photocatalysts. Gallium nitride (GaN) formed from Ga₂O₃ at 973K, and GaN:ZnO was obtained over 1073K under NH₃ gas flow. Nitrogen content in GaN:ZnO increased with increasing nitridation temperature and time, while zinc content decreased because...

article

Selective reduction of NOx by C3H6 over Pd–NiO/(Y0.99Ba0.01)2O3 under oxygen excess conditions

Lin Liu, Kohei Murakami, Shintaro Ida, Tatsumi Ishihara

Catalysis Communications > 2017 > 100 > C > 5-9

A Pd-NiO/Y(Ba)₂O₃ developed catalyst shows high activity to selective NO_x reduction into N₂ (yield ~70%) with C₃H₆ under oxygen excess conditions. Y(Ba)₂O₃ support material is active to NO direct decomposition at high temperatures and is considered to selectively adsorb NO. By depositing NiO and Pd simultaneously, high NO selective reduction activity is exhibited around 200°C and the activity is hardly...

article

Inorganic/whole-cell biohybrid photocatalyst for highly efficient hydrogen production from water

Yuki Honda, Motonori Watanabe, Hidehisa Hagiwara, Shintaro Ida, more

Applied Catalysis B: Environmental > 2017 > 210 > C > 400-406

To obtain a clean hydrogen production system, we have developed an inorganic-bio hybrid photocatalyst system based on the combination of anatase TiO₂, methylviologen (MV) as an electron mediator, and a whole-cell biocatalyst consisting of [FeFe]-hydrogenase and maturase gene-harboring recombinant Escherichia coli; however, the apparent quantum yield at 300nm (AQY₃₀₀) for hydrogen production was low...

article

Ni‐Fe Nitride Nanoplates on Nitrogen‐Doped Graphene as a Synergistic Catalyst for Reversible Oxygen Evolution Reaction and Rechargeable Zn‐Air Battery

Yuchi Fan, Shintaro Ida, Aleksandar Staykov, Taner Akbay, more

Small > 13 > 25 > n/a - n/a

Obtaining bifunctional electrocatalysts with high activity for the oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) is a main hurdle in the application of rechargeable metal‐air batteries. Earth‐abundant 3d transition metal‐based catalysts have been developed for the OER and ORR; however, most of these are based on oxides, whose insulating nature strongly restricts their catalytic...

article

Oxidative reforming of propane with oxygen permeating membrane reactor using Pr2Ni0.75Cu0.25Ga0.05O4 perovskite related mixed conductor

Jinda Yeyongchaiwat, Hiroshige Matsumoto, Tatsumi Ishihara

Solid State Ionics > 2017 > 301 > C > 23-27

Reforming of propane for the production of syngas can improve the utilisation of petroleum products in chemical and energy processes as it is a major constituent in refinery gas. The search for catalytic and selective membranes for the efficient conversion of natural gas with carbon higher than methane is very attractive and remains challenging. Since Pr₂Ni_0.75Cu_0.25Ga_0.05O₄ possesses high mixed conductivity...

article

Evaluation of isotope diffusion coefficient and surface exchange coefficient of ScSZ series oxide by oxygen isotope exchange method

Takaaki Sakai, Junji Hyodo, Masako Ogushi, Atsushi Inoishi, more

Solid State Ionics > 2017 > 301 > C > 156-162

In this work, the Isotope diffusion coefficient (D*) and surface exchange coefficient (k*) of Sc₂O₃ stabilized ZrO₂ (ScSZ) series oxide, 6mol% Sc₂O₃-ZrO₂ (6ScSZ), 10mol% Sc₂O₃-ZrO₂ (10ScSZ) and 10mol% Sc₂O₃- 1mol% CeO₂-ZrO₂ (10Sc1CeSZ) were evaluated by using oxygen isotope exchange method. It was found that these ScSZ oxides showed a relatively higher D* value; 10Sc1CeSZ showed 1.1×10⁻⁷cm²s⁻¹, 10ScSZ...

article

Highly active oxide cathode of La(Sr)Fe(Mn)O3 for intermediate temperature CO2 and CO2-H2O co-electrolysis using LSGM electrolyte

Tatsumi Ishihara, Shijing Wang, Kuan-Ting Wu

Solid State Ionics > 2017 > 299 > C > 60-63

Electrochemical conversion of carbon dioxide to carbon monoxide (CO₂→CO) is a potential step in the desirable transformation of the greenhouse gas to fuel or useful chemicals. In this study, the electrochemical conversion of CO₂ to CO and H₂O to H₂ on an oxide cathode was studied in a solid oxide electrolysis cell (SOEC) by using a LaGaO₃-based electrolyte (La_0.9Sr_0.1Ga_0.8Mg_0.2O₃, LSGM) at elevated...

article

Ni doped PrSr3Fe3O10-δ Ruddlesden-Popper oxide for active oxygen reduction cathode for solid oxide fuel cell

Soamwadee Chaianansutcharit, Young Wan Ju, Shintaro Ida, Tatsumi Ishihara

Electrochimica Acta > 2016 > 222 > C > 1853-1860

PrSr₃Fe_3-yNi_yO_10-δ (PSFNO10, 0<y<0.2) was synthesized and investigated for the potential active cathode of a solid oxide fuel cell operating at low temperature. Effects of Ni substitution in PrSr₃Fe₃O₁₀ on the structure, thermal expansion property, electrical conductivity, and cathodic performance of SOFC were studied. PSFNO10 has a tetragonal crystal structure with a I4/mmm space group. The...

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SOLID OXIDE FUEL CELL (13)
PROTON CONDUCTOR (9)
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Y2O3 (3)
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INFONA - science communication portal

Search results for: Tatsumi Ishihara

Fe₂O₃ powder modified with Ce_0.6Mn_0.3Fe_0.1O₂ and Cr₂O₃ prepared by spray pyrolysis method for rechargeable Fe–air cell

[2.2]‐ and [3.3]Paracyclophane as Bridging Units in Organic Dyads for Visible‐Light‐Driven Dye‐Sensitized Hydrogen Production

Correlating Surface Crystal Orientation and Gas Kinetics in Perovskite Oxide Electrodes

High‐pressure torsion of SiO₂ quartz sand: Phase transformation, optical properties, and significance in geology

A CO₂‐Tolerant Perovskite Oxide with High Oxide Ion and Electronic Conductivity

Designing Optimal Perovskite Structure for High Ionic Conduction

A Cocatalyst that Stabilizes a Hydride Intermediate during Photocatalytic Hydrogen Evolution over a Rhodium‐Doped TiO₂ Nanosheet

A Cocatalyst that Stabilizes a Hydride Intermediate during Photocatalytic Hydrogen Evolution over a Rhodium‐Doped TiO₂ Nanosheet

Pt‐Rh/TiO₂/activated carbon as highly active and stable HI decomposition catalyst for hydrogen production in sulfur‐iodine (SI) process

Pt‐Ce_0.9Cu_0.1O₂/activated carbon as highly active and stable HI decomposition catalyst

Reduction mechanism of selective NO reduction on Pd-NiO/(Y0.99Ba0.01)2O3 catalyst

[FeFe]-Hydrogenase and its organic molecule mimics—Artificial and bioengineering application for hydrogenproduction

Effects of preparation condition on the photocatalytic activity of porphyrin-modified GaN:ZnO for water splitting

Selective reduction of NOx by C3H6 over Pd–NiO/(Y0.99Ba0.01)2O3 under oxygen excess conditions

Inorganic/whole-cell biohybrid photocatalyst for highly efficient hydrogen production from water

Ni‐Fe Nitride Nanoplates on Nitrogen‐Doped Graphene as a Synergistic Catalyst for Reversible Oxygen Evolution Reaction and Rechargeable Zn‐Air Battery

Oxidative reforming of propane with oxygen permeating membrane reactor using Pr2Ni0.75Cu0.25Ga0.05O4 perovskite related mixed conductor

Evaluation of isotope diffusion coefficient and surface exchange coefficient of ScSZ series oxide by oxygen isotope exchange method

Highly active oxide cathode of La(Sr)Fe(Mn)O3 for intermediate temperature CO2 and CO2-H2O co-electrolysis using LSGM electrolyte

Ni doped PrSr3Fe3O10-δ Ruddlesden-Popper oxide for active oxygen reduction cathode for solid oxide fuel cell

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