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Which formate?

If sodium formate (pure), no he is wrong, it is 487*F

But it is water soluble like table salt, so add a little water and it is an entirely different story. The melting point of table slat is way up there, but it id highly soluble in water. Since the MVTG ERC would make formic acid at about 80%, and 20% water, it is safe to assume the MVTG ERC sodium formate would be in the same ballpark and would therefore be a liquid just formic acid.

You will need to find the chemical data tables at a University library with the actual % water/% formate or formic acid to find the freezing or melting point in a data table or curve plot. Doubt you will find it on line. But Wiki does list the water solubility saturation data at a STP as recall.

In other words, water is the carrier that lowers the freezing/melting point of the formates/formic acid.

From Wiki:
Solubility limit for sodium formate in water:

43.82 g/100 mL (0 °C)
97.2 g/100 mL (20 °C)
160 g/100 mL (100 °C)

So a saturated solution could be run through the fuel cell, and then run through a saturated bath of 50% solid sodium formate, 50% water to make a new saturated solution to reuse back into the fuel cell in a loop. The heat from the fuel cell would warm and keep the fuel storage reservoir warm.