Technical Papers
A Study on Matrix of LiAlO2 Powder Coated with Cobalt Oxide for Molten Carbonate Fuel Cell
1999 Volume 67 Issue 6 Pages 622-627
Details
1999 Volume 67 Issue 6 Pages 622-627
A new way to solve the nickel deposition problem in the matrix of MCFC has been proposed, i.e. by using the matrix of LiAlO2 powder coated with cobalt oxide to decrease the concentration of reducing agents (such as H2) in the matrix through the reaction with in situ oxide agents. The possibility of the co-existence of H2 and O2 at a trace amount in the presence of normal γ-LiAlO2 matrix powder around 650 °C was verified by the gas chromatography analysis. It was found that H2 amount was sharply reduced in the presence of γ-LiAlO2 matrix powder coated with cobalt oxide, that means the cobalt oxide have the catalytic function for the reaction of H2 and O2 even while both H2 and O2 are at a trace amount. Electrochemical measurement showed that the redox potential (Eredox) in the normal matrix was almost the same in the tested distance ratios, and the value was less than −1000 mV. However, the Eredox value in the matrix coated with cobalt oxide increased linearly with the distance ratio from the anode side to the cathode side. According to the nickel deposition potential, it was deduced that Ni deposite zone might be limited within the region near the anode side. Therefore, it was anticipated that the short-circuit time of a cell would be postponed by use of the matrix with cobalt oxide.
