The reorganization energy of the CO2RR shows clear cation-dependence following the order of Li > Na > K > Cs > TMA > TEA > TPA (Fig. and). According to the MHC theory, the reorganization energy refers to the contribution to the energy barrier associated with the configuration change of reactants and the surrounding environment. In the context of CO2RR on Au, changes in the structure of both CO2 and H2O need to be considered. The contribution of CO2 stems from the change in the molecular configuration from linear to bent, which is comparable in the presence of various alkali metal cations . With water serving as both a reactant and the solvent, its contribution to the reorganization energy is composed of the change in not only its molecular structure along the reaction coordinate in the RDS but also the solvent structure around the reactants and the activated complex. For example, it was reported that the H-bond network structure contributed to the reorganization energy of the interconversion of the Fe(CN)6 3-/ Fe(CN)6 4-redox pair and the hydrogen evolution reaction (HER) .