ANALYSIS OF PERFORMANCE OF MOLTEN-CARBONATE FUEL-CELL .5. FORMULATIONOF ANODE REACTION RESISTANCE

The accuracy of estimated performance of Molten Carbonate Fuel Cell (M CFC) under various operating conditions depends on that of the formula tion for reaction overpotential. It has been clarified that the behavi or of cathode overpotential is well estimated from the dependence of m ixed diffusion of superoxide ion (O-2(.)) and CO2 in (Li+K)/CO3 molten carbonate on the assumed partial pressure. On the other hand. the ano de overpotential would be usually small compared with cathode overpote ntial and independent of partial pressure. However. we have found that anode overpotential increases at low hydrogen partial pressure. To an alyze this problem, we have examined the anode performances of single cells operated under various anode gas conditions expected to be used in LNG or Coal fueled power plant. As a result, it is shown that the b ehavior of anode overpotential is well described with P(H-2).(0.5) (H- 2 partial pressure to minus half power) dependence.