in principle allows for the rate of PT across a polarized interface to be measured in the absence of any welldefined surface structure. In this system, there is no preferred proton adsorption site related to surface morphology. The non-aqueous basic proton-accepting molecule lowers the standard potential for the transfer of the proton, enabling the study of proton-transfer rates without the convoluting current of background electrolyte ion transfer (Figure ). Of particular interest is the standard rate constant 𝑘𝑘 0 for this reaction, as it measures the facility of the proton-transfer reaction at equilibrium and standard-state conditions. Tracking changes to 𝑘𝑘 0 as a function of solvent properties such as viscosity or dielectric constant would be important for testing hypotheses about the molecular details that gate ion-transfer rates.