Degradation of matrix electrolyte under Molten Carbonate Fuel Cell environment

The change in phase composition, dispersibility and morphology of α-, β- and γ-lithium aluminates, which are the components of molten carbonate fuel cell were investigated after long exposure in Li/KCO₃ (62/38 vol.%) eutectic melt under H₂, H₂ + CO₂ (20-mol.%) and 0.33 O₂ + 0.67 CO₂ atmospheres at 650°C. α- , β- , γ- aluminates and their mixtures were found to transform into γ-phase under oxidative atmosphere. Under reducing atmosphere both α- and γ-phases always coexist. It was also found that degradation processes that is particle enlargement, decrease of specific surface and morphology change proceed at much higher rate in α- and β- phases than in γ-LiAlO₂.

Authors:

Aleksandrov K. A., Institute of high-temperature Electrochemistry UB of RAS, 20, Akademicheskaya St., Yekaterinburg, 620990

Batalov Nikolai Nikolaevich, Institute of high-temperature Electrochemistry UB of RAS, 20, Akademicheskaya St., Yekaterinburg, 620990, batalov@ihim.uran.ru

Kozlova Z. R., Institute of high-temperature Electrochemistry UB of RAS, 20, Akademicheskaya St., Yekaterinburg, 620990

Surikov V. T., Institute of Chemistry of a Solid body UB of RAS, 91, GSP, Pervomayskaya St., Yekaterinburg, 620990

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Journal issue:

2007. Т. 7, № 1,