Abstract: A composition is provided that can be used, for example, in a fuel processor for a fuel cell system. The composition includes a first material such as a catalyst, and a second material such as a desiccant. The second material is capable of sorbing and desorbing a heat transfer material such as water, and is present in an amount sufficient to sorb an amount of the heat transfer material sufficient to remove a portion of the heat generated when the first material undergoes an exothermic reaction.

Abstract: A fuel cell coolant tank system includes a fuel cell stack including a plurality of fuel cells, a coolant manifold, and a coolant outlet manifold. A coolant expansion tank above the fuel cell stack has an input connected to the coolant inlet manifold of the fuel cell stack and an output connected to the coolant outlet manifold of the fuel cell stack.

Abstract: A fuel cell system includes a first reactant intake manifold, a first reactant output manifold, a second reactant intake manifold, a second reactant output manifold, a cooling gas intake manifold, a cooling gas output manifold, a liquid intake manifold, fuel cells and a cooling elements distributed among the fuel cells. Each cooling element defines a coolant passage. During operation, a cooling gas flows from the cooling gas intake manifold into the cooling gas output manifold through the coolant passage. Each cooling element also includes a water injection path. During operation water from the liquid intake manifold is injected into the coolant passage to mix with the cooling gas passing therethrough.