The Experts below are selected from a list of 4923 Experts worldwide ranked by ideXlab platform
Hirohisa Tanaka - One of the best experts on this subject based on the ideXlab platform.
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electrooxidation of Hydrazine Hydrate using ni la catalyst for anion exchange membrane fuel cells
Journal of Power Sources, 2013Co-Authors: Tomokazu Sakamoto, Koichiro Asazawa, Ulises Martinez, Barr Halevi, Toshiyuki Suzuki, Shigeo Arai, Daiju Matsumura, Yasuo Nishihata, Plamen Atanassov, Hirohisa TanakaAbstract:Abstract Carbon supported Ni, La, and Ni 1− x La x (0.1 ≤ x ≤ 0.9) catalysts were synthesized by an impregnation/freeze-drying procedure followed by thermal annealing. The catalytic activity for electro-oxidation of Hydrazine Hydrate on anionic ionomer-coated catalysts was evaluated using a (4 × 4) 16-channel electrochemical electrode array in 1.0 M KOH + 1.0 M Hydrazine Hydrate solution at 60 °C. The Ni 0.9 La 0.1 /C catalyst oxidized Hydrazine Hydrate at a lower potential and exhibited higher mass activity in comparison with a similarly made Ni/C catalyst. Chemical insight suggests that the cause of improved performance for the Ni 0.9 La 0.1 /C catalyst is likely multifunctional synergism of the components. However, X-ray absorption fine structure (XAFS) and high voltage electron microscopy (HVEM) unexpectedly show some hcp−LaNi 5 shells coating the fcc−Ni catalyst particles. As a result of the screening tests, an unsupported Ni 0.9 La 0.1 catalyst was synthesized by spray pyrolysis and tested in a direct Hydrazine Hydrate fuel cell MEA (DHFC) producing 453 mW cm −2 .
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study of anode catalysts and fuel concentration on direct Hydrazine alkaline anion exchange membrane fuel cells
Journal of The Electrochemical Society, 2009Co-Authors: Koichiro Asazawa, Tomokazu Sakamoto, Hirohisa Tanaka, Susumu Yamaguchi, Koji Yamada, Hirotoshi Fujikawa, Keisuke OguroAbstract:A platinum-free fuel cell using liquid Hydrazine Hydrate (N 2 H 4 ·H 2 O) as the fuel and comprised of a cobalt or nickel anode and a cobalt cathode exhibits high performance. In this study, the fuel cell performances using nickel, cobalt, and platinum as anode catalysts are evaluated and compared. It is found that fuel cell performance in the case of nickel and cobalt is higher than that in the case of platinum. Further, anodic reactions are discussed by comparing the Hydrazine consumption and ammonia generation when cobalt and nickel are used as anode catalyst. Cobalt exhibits a higher rate of decomposition than nickel. Nickel is found to be the most suitable anode catalyst among the above mentioned anode catalysts for this fuel cell. The influence of Hydrazine Hydrate and KOH concentrations in the fuel on cell performance is also discussed. Cell performance is the highest at a Hydrazine Hydrate concentration of 4 M and a KOH concentration of 1 M. The maximum power density of the alkaline anion-exchange membrane fuel cell, comprised of a nickel anode and a Co-PPY-C (cobalt polypyrrole carbon) cathode, is 617 mW cm -2 .
Defeng Zhao - One of the best experts on this subject based on the ideXlab platform.
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simple and eco friendly reduction of nitroarenes to the corresponding aromatic amines using polymer supported Hydrazine Hydrate over iron oxide hydroxide catalyst
Green Chemistry, 2006Co-Authors: Qixun Shi, Kun Jin, Zhuxia Zhang, Defeng ZhaoAbstract:Aromatic amines were conveniently, rapidly and, importantly, environmentally benignly prepared in excellent yields through chemoselective reduction of the corresponding aromatic nitro compounds with polymer-supported Hydrazine Hydrate in the presence of iron oxide hydroxide catalyst.
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reduction of sulphur containing aromatic nitro compounds with Hydrazine Hydrate over iron iii oxide mgo catalyst
Chinese Chemical Letters, 2006Co-Authors: Qixun Shi, Zhuxia Zhang, Defeng ZhaoAbstract:Sulphur-containing aromatic amines were prepared efficiently in good to excellent yields by reduction of the corresponding sulphur-containing aromatic nitro compounds with Hydrazine Hydrate in the presence of iron(Ⅲ) oxide-MgO catalyst. The catalyst exhibited high activity and stability for the reduction of sulphur-containing aromatic nitro compounds. The yields of sulphur-containing aromatic amines were up to 91-99% at 355K after reduction for 1-4h over this catalyst.
Koichiro Asazawa - One of the best experts on this subject based on the ideXlab platform.
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electrooxidation of Hydrazine Hydrate using ni la catalyst for anion exchange membrane fuel cells
Journal of Power Sources, 2013Co-Authors: Tomokazu Sakamoto, Koichiro Asazawa, Ulises Martinez, Barr Halevi, Toshiyuki Suzuki, Shigeo Arai, Daiju Matsumura, Yasuo Nishihata, Plamen Atanassov, Hirohisa TanakaAbstract:Abstract Carbon supported Ni, La, and Ni 1− x La x (0.1 ≤ x ≤ 0.9) catalysts were synthesized by an impregnation/freeze-drying procedure followed by thermal annealing. The catalytic activity for electro-oxidation of Hydrazine Hydrate on anionic ionomer-coated catalysts was evaluated using a (4 × 4) 16-channel electrochemical electrode array in 1.0 M KOH + 1.0 M Hydrazine Hydrate solution at 60 °C. The Ni 0.9 La 0.1 /C catalyst oxidized Hydrazine Hydrate at a lower potential and exhibited higher mass activity in comparison with a similarly made Ni/C catalyst. Chemical insight suggests that the cause of improved performance for the Ni 0.9 La 0.1 /C catalyst is likely multifunctional synergism of the components. However, X-ray absorption fine structure (XAFS) and high voltage electron microscopy (HVEM) unexpectedly show some hcp−LaNi 5 shells coating the fcc−Ni catalyst particles. As a result of the screening tests, an unsupported Ni 0.9 La 0.1 catalyst was synthesized by spray pyrolysis and tested in a direct Hydrazine Hydrate fuel cell MEA (DHFC) producing 453 mW cm −2 .
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study of anode catalysts and fuel concentration on direct Hydrazine alkaline anion exchange membrane fuel cells
Journal of The Electrochemical Society, 2009Co-Authors: Koichiro Asazawa, Tomokazu Sakamoto, Hirohisa Tanaka, Susumu Yamaguchi, Koji Yamada, Hirotoshi Fujikawa, Keisuke OguroAbstract:A platinum-free fuel cell using liquid Hydrazine Hydrate (N 2 H 4 ·H 2 O) as the fuel and comprised of a cobalt or nickel anode and a cobalt cathode exhibits high performance. In this study, the fuel cell performances using nickel, cobalt, and platinum as anode catalysts are evaluated and compared. It is found that fuel cell performance in the case of nickel and cobalt is higher than that in the case of platinum. Further, anodic reactions are discussed by comparing the Hydrazine consumption and ammonia generation when cobalt and nickel are used as anode catalyst. Cobalt exhibits a higher rate of decomposition than nickel. Nickel is found to be the most suitable anode catalyst among the above mentioned anode catalysts for this fuel cell. The influence of Hydrazine Hydrate and KOH concentrations in the fuel on cell performance is also discussed. Cell performance is the highest at a Hydrazine Hydrate concentration of 4 M and a KOH concentration of 1 M. The maximum power density of the alkaline anion-exchange membrane fuel cell, comprised of a nickel anode and a Co-PPY-C (cobalt polypyrrole carbon) cathode, is 617 mW cm -2 .
Tomokazu Sakamoto - One of the best experts on this subject based on the ideXlab platform.
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electrooxidation of Hydrazine Hydrate using ni la catalyst for anion exchange membrane fuel cells
Journal of Power Sources, 2013Co-Authors: Tomokazu Sakamoto, Koichiro Asazawa, Ulises Martinez, Barr Halevi, Toshiyuki Suzuki, Shigeo Arai, Daiju Matsumura, Yasuo Nishihata, Plamen Atanassov, Hirohisa TanakaAbstract:Abstract Carbon supported Ni, La, and Ni 1− x La x (0.1 ≤ x ≤ 0.9) catalysts were synthesized by an impregnation/freeze-drying procedure followed by thermal annealing. The catalytic activity for electro-oxidation of Hydrazine Hydrate on anionic ionomer-coated catalysts was evaluated using a (4 × 4) 16-channel electrochemical electrode array in 1.0 M KOH + 1.0 M Hydrazine Hydrate solution at 60 °C. The Ni 0.9 La 0.1 /C catalyst oxidized Hydrazine Hydrate at a lower potential and exhibited higher mass activity in comparison with a similarly made Ni/C catalyst. Chemical insight suggests that the cause of improved performance for the Ni 0.9 La 0.1 /C catalyst is likely multifunctional synergism of the components. However, X-ray absorption fine structure (XAFS) and high voltage electron microscopy (HVEM) unexpectedly show some hcp−LaNi 5 shells coating the fcc−Ni catalyst particles. As a result of the screening tests, an unsupported Ni 0.9 La 0.1 catalyst was synthesized by spray pyrolysis and tested in a direct Hydrazine Hydrate fuel cell MEA (DHFC) producing 453 mW cm −2 .
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study of anode catalysts and fuel concentration on direct Hydrazine alkaline anion exchange membrane fuel cells
Journal of The Electrochemical Society, 2009Co-Authors: Koichiro Asazawa, Tomokazu Sakamoto, Hirohisa Tanaka, Susumu Yamaguchi, Koji Yamada, Hirotoshi Fujikawa, Keisuke OguroAbstract:A platinum-free fuel cell using liquid Hydrazine Hydrate (N 2 H 4 ·H 2 O) as the fuel and comprised of a cobalt or nickel anode and a cobalt cathode exhibits high performance. In this study, the fuel cell performances using nickel, cobalt, and platinum as anode catalysts are evaluated and compared. It is found that fuel cell performance in the case of nickel and cobalt is higher than that in the case of platinum. Further, anodic reactions are discussed by comparing the Hydrazine consumption and ammonia generation when cobalt and nickel are used as anode catalyst. Cobalt exhibits a higher rate of decomposition than nickel. Nickel is found to be the most suitable anode catalyst among the above mentioned anode catalysts for this fuel cell. The influence of Hydrazine Hydrate and KOH concentrations in the fuel on cell performance is also discussed. Cell performance is the highest at a Hydrazine Hydrate concentration of 4 M and a KOH concentration of 1 M. The maximum power density of the alkaline anion-exchange membrane fuel cell, comprised of a nickel anode and a Co-PPY-C (cobalt polypyrrole carbon) cathode, is 617 mW cm -2 .
Mohamed Hilmy Elnagdi - One of the best experts on this subject based on the ideXlab platform.
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On the reaction of phenacylmalononitrile with Hydrazines: A new route to pyrazolo[3,4-c]pyridazine, isoxazolo[5,4-c]pyridazine and pyrimido[4,5-c]pyridazine
Journal of Saudi Chemical Society, 2011Co-Authors: Saleh Mohammed Al-mousawi, Moustafa Sherief Moustafa, Mohamed Hilmy ElnagdiAbstract:Abstract The reaction of arylmalononitiles 1a , b with Hydrazine Hydrate at room temperature has afforded 3-oxo-6-aryl-2,3,4,5-tetrahydropyridazine-4-carbonitrile 3a , b as the sole isolable product. These 3-oxopyridazin-4-carbonitriles underwent aromatization to 3-oxo-6-phenylpyridazine-4-carbonitrile 4 on attempted coupling with benzene diazonium chloride. Compound 3a reacted with Hydrazine Hydrate as well as urea to yield pyrazolo[3,4-c]pyridazine 5 and pyrimido[4,5-c]pyridazine 6 . On the other hand, amidoximes 7a , b were isolated from reaction of 3a , b with hydroxylamine hydrochloride. Amidoximes 7a could be cyclized successfully into 5-phenylisoxazolo[5,4-c]pyridazin-3-amine 8 while 7b could not be cyclized on our hand.
