Patent ID: 7138199

Claim:
A fuel cell comprising an anode, a cathode, and a coolant recirculating in a loop, said coolant composition comprising de-ionized water, an organic corrosion inhibitor, an organic freezing point depressant, and an ion exchange resin suspended in the coolant, wherein the de-ionized water is present in an amount of from about 10 to about 90 per cent by volume of the de-ionized water and the organic freezing point depressant, the organic freezing point depressant is present in an amount of from about 90 to about 10 per cent by volume of the de-ionized water and freezing point depressant, the organic corrosion inhibitor is present in an amount of from about 0.01 to about 5 per cent by weight of the coolant composition, and the ion exchange resin is present in an amount of from about 0.01 to about 4 per cent by weight of the coolant composition.