Abstract: A compound including at least one copper II complex of a material selected from the group of imidazole and imidazole derivatives is provided for use in a gas generant composition. An associated burn rate enhanced gas generant composition, in addition to such copper complex-containing compound, also includes a nitrogen-containing non-azide fuel. Additionally provided are methods for improving the combustion performance of a non-azide gas generant composition in at least one aspect selected from the group consisting of ignitability, burn rate and burn rate pressure sensitivity, through the addition of such copper complex-containing compound to the non-azide gas generant composition.