This article investigates ion solvation kinetics at bipolar membranes (BPMs) and electrolyte–metal interfaces, focusing on the roles of bias-dependent activation entropy and enthalpy, interfacial capacitance, and the differences in solvation kinetics between H⁺ and OH⁻ ions. The study reveals that OH⁻ solvation is slower than H⁺ solvation and that solvation kinetics are independent of catalyst structure, attributed to a universal charge needed to induce electric fields that alter water interfacial entropy. The results highlight the importance of interfacial solvation kinetics in electrocatalysis and energy conversion technologies, such as fuel cells, electrolyzers, and CO₂ capture. The study also shows that bias-dependent capacitance plays a crucial role in determining the pre-exponential factor and activation energy for ion solvation, with significant implications for understanding and designing efficient electrochemical systems. The findings suggest that interfacial capacitance influences the activation entropy and enthalpy of ion solvation, and that the bias-dependent pre-exponential factor is linked to the interfacial water structure. The study provides a comprehensive understanding of the relationship between interfacial capacitance, ion solvation kinetics, and electrochemical performance, offering insights into the design of more efficient electrochemical systems.This article investigates ion solvation kinetics at bipolar membranes (BPMs) and electrolyte–metal interfaces, focusing on the roles of bias-dependent activation entropy and enthalpy, interfacial capacitance, and the differences in solvation kinetics between H⁺ and OH⁻ ions. The study reveals that OH⁻ solvation is slower than H⁺ solvation and that solvation kinetics are independent of catalyst structure, attributed to a universal charge needed to induce electric fields that alter water interfacial entropy. The results highlight the importance of interfacial solvation kinetics in electrocatalysis and energy conversion technologies, such as fuel cells, electrolyzers, and CO₂ capture. The study also shows that bias-dependent capacitance plays a crucial role in determining the pre-exponential factor and activation energy for ion solvation, with significant implications for understanding and designing efficient electrochemical systems. The findings suggest that interfacial capacitance influences the activation entropy and enthalpy of ion solvation, and that the bias-dependent pre-exponential factor is linked to the interfacial water structure. The study provides a comprehensive understanding of the relationship between interfacial capacitance, ion solvation kinetics, and electrochemical performance, offering insights into the design of more efficient electrochemical systems.