), which are formed through the dissociation of PC, are also considered to occur in a similar 1:1 association state. Therefore, these changes in diffusion (Q > Q •-> Q 2-) is considered to relate to the extensive formation of a HB network consisting of repeating units composed of multiple H2Q and O2 •-, rather than a change in the stoichiometry increasing the number of HBs. The formation of the HB network, as observed in the diffusion coefficient, cannot be detected by electrochemical analyses of aqueous systems. However, Figure shows that the key simulation parameters for the superior kinetics of 2PCET were the kinetic coefficients of HB formation (step (i)) and dissociation (step (iii)).