Fuel cell and fuel cell coolant compositions

A method for removing heat generated in a fuel cell stack located in a loop by recirculating a heat transfer liquid through the loop, said loop comprising the fuel cell stack and a heat transfer removal means, said method comprising:

• mixing deionized water and an organic freezing point depressant to obtain a deionized water and organic freezing point depressant mixture, wherein the deionized water is present in an amount of from about 10 to about 90% by volume of the deionized water and organic freezing point depressant mixture, and the organic freezing point depressant is present in an amount of from about 90 to about 10 percent by volume of the deionized water and freezing point depressant mixture;
• mixing an organic corrosion inhibitor and an ion exchange resin to said deionized water and freezing point depressant mixture to obtain the heat transfer fluid, wherein the organic corrosion inhibitor is present in an amount of from about 0.01 to about 5 percent by weight of the heat transfer fluid, and the ion exchange resin is present as a suspension in the heat transfer fluid and in an amount of from about 0.01 to about 4 percent by weight of the heat transfer fluid;
• recirculating the heat transfer liquid in the loop through the fuel cell stack and the heat transfer removal means;
• whereby the recirculating heat transfer liquid removes the heat generated in the fuel cell stack.