At a specific external pressure, such as 0.26667 Pa, the system reaches a state where the balance between the enthalpy change (ΔH) and the entropy change (ΔS) results in a stable value for the Gibbs free energy. The enthalpy term, representing the heat released during the reaction, becomes more significant at higher pressures, causing the reaction to release more energy. As a result, the Gibbs free energy, reaches a point where the exothermic nature of the system counteracts any entropy-driven changes. In conclusion, the entropy of the system impacts the OER rate positively.