All DFT calculations in this work were performed using the Vienna ab initio Simulation Package. The Perdew-Burke-Ernzerhof functional was used to model exchange and correlation effects. The influence of core electrons was included using the projector augmented wave method. The valence electron configurations for all elements comprising the materials in this study are listed in the Supporting Information. Plane-wave basis sets with energy cutoffs of 450 and 550 eV were used for Ca-and Mg-containing materials, respectively, following ref 17. An energy cutoff of 550 eV was also used for Zn-containing materials.