In addition to M31, the spectra at M1, M2, M3, M19, and M29 also increased in MS ion current. M1 and M2 increase can be easily assigned to H2 production, where M2 was the molecular H2+ ion and M1 was fragmented or doubly ionized H2. M3 also is relevant to H2, which can be due to a partially deuterated hydrogen (HD+ ion) or potentially another effect (vide infra). Since the aqueous KOH solution was saturated with CO during the experiment, CO and H2O were the two most abundant species in the MS chamber. H2O primarily generates molecular ions at M18 whereas CO generates molecular ions at M28, M29 (with 13 C isotope), and M30 (with 18 O isotope). Interestingly, we see changes between the two experiments at M19, M29, and M31. As Pt only produces H2, the changes in these masses must be indirectly related to the H2 produced.