Dual Synergistic Effects in a Ce-Modified MnO2/MnO Heterostructure Enabling Outstanding Acidic Oxygen Evolution AITranslate

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The development of highly efficient and stable nonprecious metal electrocatalysts for the acidic oxygen evolution reaction (OER) is crucial to advance proton exchange membrane (PEM) water electrolysis. In this work, a dual synergistic strategy was proposed by constructing a Ce-modified MnO2/MnO heterostructure. The catalyst exhibited outstanding OER performance, achieving a low overpotential of 335 mV at 10 mA cm−2 in 0.5 M H2SO4, along with exceptional long-term stability, sustaining operation for 115 h at a high current density of 1 A cm−2. Mechanistic studies revealed that the outstanding performance originates from the dual synergistic effects: The built-in electric field at the heterointerface optimizes the adsorption of oxygen intermediates and alters the rate-determining step; the introduced Ce species, through orbital hybridization and charge transfer enhancement, promotes reaction kinetics. Furthermore, the electron-deficient state of MnO2 induced by the internal electric field effectively suppresses excessive Mn dissolution, ensuring exceptional stability in acidic media.