Both the hydroxide and the carbonate melt are proposed and tested by researchers trying to develop a DCFC (Direct Carbon Fuel Cell). It is well known that the hydroxide melt is not stable due to the carbon dioxide formed in the fuel cell reaction. The hydroxide ion OH reacts with CO2 to form carbonate ions and water. From this reaction it is clear that in either approach the melt is a mixture of carbonate and hydroxide depending on the partial pressures of water and CO2 above the melt. Therefore a good insight in the equilibria present in the melts is essential for understanding and optimizing the DCFC. Following the method introduced by Smith and Missen a complete and independent set of equilibria describing the chemical equilibrium in the melt can be obtained using linear algebra6. Using the modification proposed by Coleman and White also electrochemical equilibria are included7. This will be done for the cathode as well as the anode environment of a DCFC.

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