Výsledky vyhledávání - "Naoki Uehara"

The Four-electron Reduction of Dioxygen on a Metal Surface: Models of Dissociative and Associative Mechanisms in a Homogeneous System

Autor: Toshiro Takao, Hajime Kameo, Takuya Kosukegawa, Hiroharu Suzuki, Shigeyoshi Sakaki, Yasuhiro Ohki, Naoki Uehara

Publikováno v: Inorganic Chemistry. 60(No. 3):1550

Two different four-electron reductions of dioxygen (O2) on a metal surface are reproduced in homogeneous systems. The reaction of the highly unsaturated (56-electron) tetraruthenium tetrahydride complex 1 with O2 readily afforded the bis(μ3-oxo) com

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9f29709caa51c2b51682fdd68f783dcc
http://t2r2.star.titech.ac.jp/cgi-bin/publicationinfo.cgi?q_publication_content_number=CTT100851577

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Free-standing, thin-film, symmetric membranes: Next-generation membranes for engineered osmosis

Autor: Jung Eun Kim, Hirozumi Matsuno, Ho Kyong Shon, Sherub Phuntsho, Maruko Nobuhiro, Naoki Uehara, Van Huy Tran, Sungil Lim, Shuji Tahara

Publikováno v: Journal of Membrane Science. 607:118145

The support layer of an asymmetric thin-film composite membrane results in structural resistance (internal concentration polarization) that significantly undermines engineered osmosis. Increasing the porosity and reducing the thickness and tortuosity

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::8e6c85457c5ec2b2ac72ada255140c35
https://doi.org/10.1016/j.memsci.2020.118145

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Kinetic study of oxygen reduction reaction on tantalum oxide-based electrocatalysts produced from oxy-tantalum phthalocyanines in acidic media

Autor: Takaaki Nagai, Kenichiro Ota, Koichi Matsuzawa, Masashi Matsumoto, Hideto Imai, Naoki Uehara, Yuji Kohno, Akimitsu Ishihara, Shigenori Mitsushima

Publikováno v: Electrochimica Acta. 182:789-794

In our previous study, we prepared tantalum oxide-based cathodes from oxy-tantalum phthalocyanines by heat treatment under low oxygen partial pressure for polymer electrolyte fuel cells. We revealed that the high onset potential for oxygen reduction

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::3ec9f45390d824ef043f3ab94468ba92
https://doi.org/10.1016/j.electacta.2015.09.161

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Tantalum oxide-based electrocatalysts made from oxy-tantalum phthalocyanines as non-platinum cathodes for polymer electrolyte fuel cells

Autor: Kenichiro Ota, Hideto Imai, Shigenori Mitsushima, Yuji Kohno, Akimitsu Ishihara, Masashi Matsumoto, Naoki Uehara, Koichi Matsuzawa

Publikováno v: Electrochimica Acta. 179:146-153

The development of non-platinum-based cathodes is required in order to commercialize polymer electrolyte fuel cells. We have previously investigated group 4 and 5 transition metal oxides because they exhibit high chemical stability under cathode cond

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::452a7f1ad6149c4c60d1a7d4ac6d343c
https://doi.org/10.1016/j.electacta.2015.03.125

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Oxygen Reduction Durability and Activity of Tantalum Oxide-Based Electrocatalysts for Cathode of Polymer Electrolyte Fuel Cells

Autor: Hideto Imai, Yoshiro Ohgi, Yuji Kohno, Akimitsu Ishihara, Yoshio Fujita, Masashi Matsumoto, Ken Ichro Ota, Shigenori Mitsushima, Naoki Uehara, Koichi Matsuzawa

Publikováno v: ECS Transactions. 69:3-12

Introduction Because of high cost, limited availability, and insufficient stability, the use of Pt as a cathode electrocatalyst for polymer electrolyte fuel cell (PEFC) is the one of major problems. In order to successfully commercialize PEFCs, non-p

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2d8322cbfb696057da58fc6a2f7146c0
https://doi.org/10.1149/06917.0003ecst

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Oxide-Based Electrocatalysts toward Oxygen Reduction Reaction as Non Pt Cathodes for PEFC

Autor: Yuji Kohno, Akimitsu Ishihara, Yoshiro Ohgi, Ken-ichiro Ota, Naoki Uehara, Koichi Matsuzawa, Shigenori Mitsushima, Masashi Matsumoto, Hideto Imai, Masazumi Arao

Publikováno v: ECS Transactions. 64:23-31

Introduction Development of non-noble metal cathode is required to commercialize polymer electrolyte fuel cells. We have investigated group 4 and 5 transition metal oxide-based cathodes. We reported that carbonitrides of tantalum, niobium, zirconium

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d653115eadaf7b9dbe6044e9658aa050
https://doi.org/10.1149/06436.0023ecst

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Nano-TaOxNy particles synthesized from oxy-tantalum phthalocyanine: how to prepare precursors to enhance the oxygen reduction reaction activity after ammonia pyrolysis?

Autor: Mitsuharu Chisaka, Hiroshi Imai, Masashi Matsumoto, Naoki Uehara, Kenichiro Ota, Akimitsu Ishihara

Publikováno v: Journal of Materials Chemistry A. 3:16414-16418

Nano-TaOxNy oxygen reduction reaction (ORR) catalysts were supported on multi-walled carbon nanotubes (MWCNTs) using two-step pyrolysis of oxy-tantalum phthalocyanine (TaOPc). For the first time, slightly oxidized Ta3N5 has been experimentally propos

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::e7e05fb8c07130beff3e80ad7cd6c11d
https://doi.org/10.1039/c5ta03860j

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Improving ORR Activity of Group 4 and 5 Metal Oxide-Based Cathodes for PEFCs

Autor: Naoki Uehara, Shihong Yin, Koichi Matsuzawa, Yoshiro Ohgi, Yuji Kohno, Akimitsu Ishihara, Hideto Imai, Shigenori Mitsushima, Mitsuharu Chisaka, Ken-ichiro Ota, Masashi Matsumoto, Yohei Okada, Kazuaki Suito

Publikováno v: ECS Transactions. 58:1495-1500

In order to develop a non-precious metal cathode for PEFCs, we have tried to improving oxygen reduction activity of Zr oxide-based cathodes. We succeeded to prepare Zr oxide-based cathodes with fine primary particles using zirconium oxy-phthalocyanin

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b8ad27bf4d34c930b168338846f01543
https://doi.org/10.1149/05801.1495ecst

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Activity of Tantalum Oxide-Based Electrocatalysts toward Oxygen Reduction Reaction for PEFC

Autor: Naoki Uehara, Shigenori Mitsushima, Yuji Kohno, Akimitsu Ishihara, Koichi Matsuzawa, Ken-ichiro Ota

Publikováno v: ECS Transactions. 58:1217-1223

Development of non-noble metal cathode is required to commercialize polymer electrolyte fuel cells. We have investigated group 4 and 5 transition metal oxide-based cathode. In this paper, tantalum oxide-based cathodes with nano-sized particles were m

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::d50073e46217b4ad7e9cbc566b4b7a4e
https://doi.org/10.1149/05801.1217ecst

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