Abstract: The Ti-Supported MnO₂ electrode was modified by introducing SnO₂ +RuO₂ +MnO₂ as an intermediate layer into the Ti/MnO₂ interface.The anodic polarization curves were measured at various temperatures ranging from 30 to 80 ℃ and the activation energy for the oxygen evolution reaction was evaluated.The experimental activation energy increased linearly with increasing the overpotential.The activation energy at the equilibrium potential was linearly correlated with the difference between the crystal field stabilization energies of Mn⁴⁺ at initial state and Mn⁴⁺ at transition state.The electrocatalysis characteristics of the anode were discussed by means of themechanism of the substitution reaction of the ligand(S_N1 and S_N2) and molecular orbital theory.The results show that the anode has better electrocatalystic characteristics.

Key words: Ti/SnO₂+RuO₂+MnO₂/MnO₂ anode, Electroeatalysis, Activation energy, Crystal field theory, Molecular Orbital theory