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Electrooxidation of hydrazine hydrate using Ni-La catalyst for anion exchange membrane fuel cells

アニオン交換式燃料電池用Ni-La触媒を使用したヒドラジン水化物の電気化学的酸化反応

坂本 友和*; 朝澤 浩一郎*; Martinez, U.*; Halevi, B.*; 鈴木 敏行*; 荒井 重勇*; 松村 大樹   ; 西畑 保雄; Atanassov, P.*; 田中 裕久*

Sakamoto, Tomokazu*; Asazawa, Koichiro*; Martinez, U.*; Halevi, B.*; Suzuki, Toshiyuki*; Arai, Shigeo*; Matsumura, Daiju; Nishihata, Yasuo; Atanassov, P.*; Tanaka, Hirohisa*

Carbon supported Ni, La, and Ni$$_{1-x}$$La$$_{x}$$ (0.1$$leq$$$$x$$$$leq$$0.9) catalysts were synthesized by an impregnation/freeze-drying procedure. The catalytic activity for electro-oxidation of hydrazine hydrate was evaluated using a 16-channel electrochemical electrode array. 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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パーセンタイル:86.88

分野:Chemistry, Physical

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