Considering the components of an electrolyte designed for LiMEAS, the proton donor (PD) identity is important as it has been shown to have a non-trivial effect on interface morphology. Specifically, the Kamlet-Taft (KT) parameters have been highlighted for their correlation to nitrogen reduction activity. To this point, previous work exploring the mechanistic importance of PD behaviors on the system showed that their positive effect on interface morphology increased Faradaic efficiency up to a threshold after which excess hydrogen evolution began to occur adversely affecting ammonia synthesis. Initially assumed to act only as a source of protons for nitrogen reduction, the PD was generally considered a design parameter for controlling hydrogen evolution by tuning its availability and dissociation. Work along these lines has involved the explorations of proton shuttles and proton donors of intermediate dissociation strength. Recent findings on the PD's effect on interfacial morphology suggest the PD may interact with other system components beyond providing protons. In particular, its role in the formation of lithium nitride remains unclear.