One of our ultimate goals is to apply the understanding obtained from the computational modeling to the rational design of CMOs that mitigate the release of potentially toxic surface cations in aqueous media, specifically by changing the chemical environment of the cations in a CMO via neighboring atoms. One route would be to choose cations that, at circumneutral or slightly acidic pH, are thermodynamically not favored to be released. Another route would be to encourage the release of cations that are more innocuous to a wide range of organisms. If any of the compositions are to be adopted industry-wide, then they must also be cost-effective replacements for elements such as Ni and Co, and demonstrate a comparable operating voltage. Here we present a survey of the properties of bulk and surface CMO compositions that include Ti, V, Mn, Fe, Co, Ni, Al. This set spans the elements of the 3d-block and includes Al. Each of these metals are less expensive than Co, can be found in octahedral coordination, and are known to form at least one stable cationic oxidation state between +2 and +4.