concentration relaxation experiments in a 52/48 mol % Li/Na molten carbonate melt saturated with NiO were performed. The was added to act as a probe for the concentration. The dynamic behavior of the and concentration during the relaxation of the melt back to the initial equilibrium was studied by recording square wave voltammograms. Our experiments show clearly that dissolution is the slowest step in the relaxation. Consequently the values for the recombination reaction rate obtained in other studies are not correct, since in them a fast dissolution was assumed. A gas dissolution rate of and Henry's constant for of at 650°C could be determined. Our numbers were used in simple calculations of the performance of the porous molten carbonate fuel cell cathode, and indicate that the dissolution rate determines the lower limit for of 0.05 atm at for proper cathode operation.
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Peelen et al. (2000) studied this question.