期刊
JOURNAL OF POWER SOURCES
卷 234, 期 -, 页码 252-259出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2013.01.181
关键词
Fuel cells; Hydrazine hydrate; Hydrazine oxidation; Ni-La catalyst; Anion exchange membrane; LaNi5
资金
- Open Advanced Research Facilities Initiative, High Performance Electron Microscopy in Support of Bio and Nano-science provided by Ministry of Education, Culture, Sports, Science and Technology (MEXT) in Japan
Carbon supported Ni, La, and Ni1-xLax (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 x 4) 16-channel electrochemical electrode array in 1.0 M KOH + 1.0 M hydrazine hydrate solution at 60 degrees C. The Ni0.9La0.1/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 Ni0.9La0.1/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-LaNi5 shells coating the fcc-Ni catalyst particles. As a result of the screening tests, an unsupported Ni0.9La0.1 catalyst was synthesized by spray pyrolysis and tested in a direct hydrazine hydrate fuel cell MEA (DHFC) producing 453 mW cm(-2). (c) 2013 Elsevier B.V. All rights reserved.
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