The impact of temperature on electrode reactions in 100 cm2 molten carbonate cells operating as Fuel Cells

(FC) and Electrolysis Cells (EC) was examined using the Reactant Gas Addition (RA) method across a temperature

range of 823 to 973 K. The RA findings revealed that introduction of H2 and CO2, reduced the overpotential at Hydrogen

Electrode (HE) in both the modes. However, no explicit temperature dependencies were observed. Conversely, adding

O2 and CO2 to the Oxygen Electrode (OE) displayed considerable temperature dependencies in FC mode which can be

attributed to increased gas solubility due to the electrolyte melting at higher temperatures. In EC mode, there was no

observed temperature dependence for overpotential. Furthermore, the addition of O2 led to a decrease in overpotential,

while CO2 addition resulted in an increased overpotential, primarily due to changes in the concentration of O2 species.

Molten carbonate, Fuel cell, Electrolysis cell, Reactant gas addition, Mass transfer, Temperature

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