Creep behavior of Ni-12 wt.% Al anodes for molten carbonate fuel cells

• Published in: Journal of power sources Vol. 109; no. 2; pp. 347 - 355
• Main Authors: Kim, Dongho, Lee, Insung, Lim, Heechun, Lee, Dokyol
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 01.07.2002; Elsevier Sequoia
• Subjects: Al 2O 3; Applied sciences; Creep strain; Energy; Energy. Thermal use of fuels; Equipments for energy generation and conversion: thermal, electrical, mechanical energy, etc; Exact sciences and technology; Fuel cells; Molten carbonate fuel cell; Ni 3Al; Ni-12 wt.% Al anode; Solid solution; Ni 3Al; Creep strain; Solid solution; Ni-12 wt.% Al anode; Al 2O 3; Molten carbonate fuel cell; Casting; Anode; Creep; Sintering; Molten carbonate fuel cells; Aluminium; Nickel; Electrode material; Microstructure
• ISSN: 0378-7753; 1873-2755
• DOI: 10.1016/S0378-7753(02)00085-X

Ni-12 wt.% Al anodes are fabricated for use in molten carbon fuel cells by tape casting and sintering. Sintering is performed in three steps, first at 1200 °C for 10 min in argon, then at 700 °C for 2.5 h in a partial oxidation atmosphere ( P H 2 / P H 2O =10 −2), and finally at 950 °C for 5 min, 30 min or 1.5 h in hydrogen. Three anodes with different phases or microstructures are produced at different reduction times. One anode contains three phases, namely Ni–Al solid solution, Ni 3Al, and Al 2O 3. The amount of Al 2O 3 is extremely small at 5 min. A second anode also contains the three phases with the amount of Al 2O 3 comparable with that of Ni 3Al at 30 min. Third anode contains two phases, i.e. Ni–Al solid solution and Al 2O 3 formed at 1.5 h. The creep strains measured for the three anodes after a 100-h creep test are practically the same with an average value of 0.85%.