A method for storing and delivering hydrogen gas is described. The method includes reacting a chemical hydride with water in the presence of a synergist. The synergist advances the extent of reaction of the chemical hydride with water to increase the yield of hydrogen production. The synergist reacts with byproducts formed in the reaction of the chemical hydride with water that would otherwise inhibit progress of the reaction. As a result, a greater fraction of hydrogen available from a chemical hydride is released as hydrogen gas.
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