PACK ALUMINIZATION OF NICKEL ANODE FOR MOLTEN-CARBONATE FUEL-CELLS

Citation
Hs. Chun et al., PACK ALUMINIZATION OF NICKEL ANODE FOR MOLTEN-CARBONATE FUEL-CELLS, Journal of power sources, 49(1-3), 1994, pp. 245-255
Citations number
19
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Electrochemistry,"Energy & Fuels
Journal title
ISSN journal
0378-7753
Volume
49
Issue
1-3
Year of publication
1994
Pages
245 - 255
Database
ISI
SICI code
0378-7753(1994)49:1-3<245:PAONAF>2.0.ZU;2-J
Abstract
The aluminum pack cementation (pack aluminization) process on a porous nickel anode for molten carbonate fuel cells has been studied to impr ove anode creep resistance. The porous nickel substrates used in this study were fabricated by doctor blade equipment followed by sintering (850-degrees-C). Packs surrounding the Ni anode were made by mixing Al 2O3 powder, Al powder, and NaCl as activator. The pack aluminization w as performed at 700 to 850-degrees-C for 0.5-5.0 h. After pack alumini zation, the principal Ni-Al intermetallic compounds detected were Ni3A l at 700-degrees-C, NiAl at 750-degrees-C and Ni3Al2 at 800-degrees-C. The aluminum content in the aluminized Ni anode was proportional to t he square root of pack aluminizing time. With increasing the Al conten t in the anode, the creep of the anode decreased. It was nearly consta nt (2.0%) when the Al content was above 5.0%. Although the exchange cu rrent density (24 mA/cm2) for the aluminized (2.5 wt.%) Ni anode was s omewhat lower than that of the pure Ni anode (40 mA/cm2), the performa nce of a single cell using an aluminized Ni anode was similar to that of the one with pure Ni anode.